AWS Certified Radiographic Interpreter (CRI) — Questions and Answers

Question 1: When documenting a porosity cluster in a weld, a CRI should record which of the following?

Only the largest individual pore diameter
The depth of the cluster below the surface
Only the number of individual pores
The area or zone affected and density of the cluster (Correct answer)

Correct answer: The area or zone affected and density of the cluster

Cluster porosity is assessed by the area it occupies and pore density within that zone, as acceptance criteria are typically area-based.

Question 2: Per API 1104, what action is required when a crack is found in a pipeline girth weld during radiographic examination?

Cracks are acceptable if they do not exceed 10% of weld length
The weld must be rejected regardless of crack length (Correct answer)
The weld may be repaired by grinding only
Cracks up to 1 inch are acceptable

Correct answer: The weld must be rejected regardless of crack length

API 1104 mandates rejection of any weld containing a crack, as cracks are never acceptable under this pipeline welding standard.

Question 3: A 'burn-through' in a weld radiograph will typically appear as:

A light spot indicating extra weld reinforcement
A series of fine parallel dark lines
A very dark circular or irregular area where excess metal melted through (Correct answer)
An absence of any image in the exposed area

Correct answer: A very dark circular or irregular area where excess metal melted through

Burn-through creates a hole or collapsed region in the weld, producing a very dark (high-density) area on the radiograph.

Question 4: A CRI is writing a report for a circumferential weld. Which location system is commonly used to describe indication positions?

Clock position or degree notation relative to a fixed reference (Correct answer)
Alphabetic grid system based on weld length
Cartesian coordinate grid referenced to the weld center
Distance from the nearest pipe flange only

Correct answer: Clock position or degree notation relative to a fixed reference

Circumferential welds use clock positions (e.g., 3 o'clock) or degree notation (e.g., 90°) referenced to a fixed datum to locate indications precisely.

Question 5: In radiographic interpretation, an elongated slag inclusion running parallel to the weld axis is best described as which type of discontinuity?

Scattered porosity
Wagon tracks (Correct answer)
Wormhole porosity
Incomplete fusion

Correct answer: Wagon tracks

Parallel elongated slag lines flanking the weld root are termed 'wagon tracks' and indicate slag trapped along the root pass interface.

Question 6: Which welding defect occurs due to improper cooling rates?

Cracking. (Correct answer)
Spatter.
Porosity.
Overlap.

Correct answer: Cracking.

Cracking in welds can often be attributed to improper cooling rates, especially when the metal cools too quickly. Rapid cooling can induce high residual stresses and promote the formation of brittle microstructures, such as martensite, which are highly susceptible to cracking. This is particularly true for hydrogen-induced cracking or solidification cracking.

Question 7: When two or more indications are separated by less than the length of the longer indication, how should they be evaluated under most code criteria?

They are treated as a single continuous indication (Correct answer)
Each is evaluated independently
They are automatically rejectable
Only the larger one is evaluated

Correct answer: They are treated as a single continuous indication

Most codes require that closely spaced indications separated by less than the longer indication's length be combined and evaluated as one continuous indication.

Question 8: The term 'radiographic sensitivity' in industrial RT refers to:

The ISO rating of the digital detector
The ability of the detector to record images quickly
The smallest detectable discontinuity size relative to specimen thickness (Correct answer)
The speed class of the radiographic film used

Correct answer: The smallest detectable discontinuity size relative to specimen thickness

Radiographic sensitivity is expressed as the smallest detectable discontinuity as a percentage of the total material thickness.

Question 9: Which type of IQI is most commonly specified in ASME Boiler and Pressure Vessel Code Section V for weld radiography?

Micro-dot IQI
Hole-type (plaque) IQI (Correct answer)
Step-wedge comparison IQI
Wire-type IQI

Correct answer: Hole-type (plaque) IQI

ASME Section V Article 2 primarily specifies hole-type (plaque) IQIs for pressure vessel and piping weld radiography, though wire IQIs are an alternative.

Question 10: What is overlap in welding?

Gas pockets inside the weld.
Incomplete weld bead.
A groove at the weld toe.
Excess weld metal over base metal without fusion. (Correct answer)

Correct answer: Excess weld metal over base metal without fusion.

Overlap is a welding defect where the weld metal flows over the surface of the base metal without actually fusing to it. This creates a weak mechanical bond rather than a strong metallurgical one, forming a lip or protrusion. It indicates insufficient heat input or improper welding technique, which can act as a stress concentrator.

Question 11: An increase in object-to-film distance (OFD) in radiographic exposure will:

Increase geometric unsharpness and magnify the image (Correct answer)
Decrease film density without affecting geometric unsharpness
Reduce geometric unsharpness and improve image sharpness
Have no effect on image sharpness if kVp is adjusted

Correct answer: Increase geometric unsharpness and magnify the image

Increasing OFD enlarges the geometric shadow of the object and increases penumbra (Ug), degrading image sharpness while also increasing magnification.

Question 12: Which of the following best describes a key competency required for material properties & testing standards in CRI practice?

The ability to work independently without any oversight
Memorization of all relevant regulations without understanding context
Reliance on a single methodology for all situations
Strong analytical skills combined with effective communication and ethical judgment (Correct answer)

Correct answer: Strong analytical skills combined with effective communication and ethical judgment

CRI professionals working in material properties & testing standards need analytical skills to assess situations, communication skills to convey findings, and ethical judgment to make sound decisions.

Question 13: When evaluating linear indications per ASME Section V, what minimum length causes an indication to be classified as 'relevant'?

1/4 inch (6.4 mm)
3/16 inch (4.8 mm)
1/16 inch (1.6 mm) (Correct answer)
1/8 inch (3.2 mm)

Correct answer: 1/16 inch (1.6 mm)

ASME Section V classifies any linear indication 1/16 inch (1.6 mm) or greater as relevant and subject to acceptance criteria evaluation.

Question 14: An 'arc strike' on base metal adjacent to a weld would appear on a radiograph as:

A dark elongated line running through the weld center
No indication, because arc strikes don't affect radiograph appearance
A bright linear indication within the weld
A dark rounded spot outside the weld zone (Correct answer)

Correct answer: A dark rounded spot outside the weld zone

Arc strikes appear as small dark rounded areas on the base metal outside the weld because local melting creates a thinner or altered zone.

Question 15: What effect does backscatter radiation have on radiographic image quality?

It increases the effective kVp of the exposure
It has no measurable effect on image quality
It sharpens image edges by adding contrast
It degrades image quality by fogging the film and reducing contrast (Correct answer)

Correct answer: It degrades image quality by fogging the film and reducing contrast

Backscatter radiation causes non-image-forming exposure on the film (fogging), which reduces contrast and may obscure relevant indications.

Question 16: Which parameter is used to calculate the 'deviation index' (DI) as defined by IEC 62494-1?

DI = 10 × log10(EI / EIT) (Correct answer)
DI = (EI / EIT) × 100
DI = EI − EIT
DI = (EI − EIT) / EIT

Correct answer: DI = 10 × log10(EI / EIT)

Per IEC 62494-1, the deviation index DI = 10 × log10(EI/EIT), providing a logarithmic measure of how far the actual exposure index deviates from the target.

Question 17: Which code or standard provides guidance on the minimum information required in a radiographic examination record per ASME Section V?

Article 22, SE-1815
Article 6, T-660
Article 1, T-120
Article 2, T-291 (Correct answer)

Correct answer: Article 2, T-291

ASME Section V, Article 2, paragraph T-291 specifies the documentation requirements for radiographic examination records.

Question 18: When a radiographic indication is found to be JUST at the acceptance limit, what is the correct CRI action?

Repeat the exposure to confirm
Accept the indication if it exactly meets but does not exceed the limit (Correct answer)
Reject because indications at the limit require engineering review
Accept only after consulting the client

Correct answer: Accept the indication if it exactly meets but does not exceed the limit

Standard radiographic acceptance criteria are inclusive—an indication that exactly meets the limit (does not exceed it) is acceptable per the governing code.

Question 19: What role does continuous improvement play in contrast & exposure parameters for CRI certified professionals?

It applies only to new professionals in their first year
It is optional and only necessary during certification renewal
It drives ongoing enhancement of practices, processes, and outcomes through systematic evaluation (Correct answer)
It focuses exclusively on cost reduction

Correct answer: It drives ongoing enhancement of practices, processes, and outcomes through systematic evaluation

Continuous improvement is fundamental to professional practice in contrast & exposure parameters, involving regular evaluation, feedback integration, and process enhancement to maintain high standards.

Question 20: In a final radiographic report, the term 'acceptable per' should be followed by what information?

The name of the radiographer who made the exposure
The date the film was processed
The type of IQI used during the examination
The specific code, standard, or specification and applicable paragraph used for acceptance (Correct answer)

Correct answer: The specific code, standard, or specification and applicable paragraph used for acceptance

Acceptance must reference the specific governing document (e.g., AWS D1.1, Section 6, Table 6.1) to make the disposition traceable and verifiable.

Question 21: In computed radiography (CR), the imaging plate stores a latent image as trapped electrons in which material?

Silver halide emulsion
Barium sulfate crystals
Calcium tungstate screens
Photostimulable phosphor (BaFBr:Eu) (Correct answer)

Correct answer: Photostimulable phosphor (BaFBr:Eu)

CR imaging plates use photostimulable phosphor (typically europium-doped barium fluorobromide) to store the latent radiographic image as excited electrons.

Question 22: A digital radiography system has a signal-to-noise ratio (SNR) that improves by a factor of 2 when the exposure is:

Halved
Increased by 10%
Quadrupled (Correct answer)
Doubled

Correct answer: Quadrupled

Because quantum noise follows Poisson statistics (σ ∝ √N), doubling the SNR requires quadrupling the number of detected photons.

Question 23: Which exposure parameter, when doubled, requires halving the exposure time to maintain equivalent film density?

kVp
Film speed class
Source-to-film distance
Milliamperage (mA) (Correct answer)

Correct answer: Milliamperage (mA)

mA and exposure time are reciprocally related; doubling mA allows the time to be halved while maintaining the same mAs and equivalent density.

Question 24: What does welding penetration refer to?

Width of the weld bead.
Length of the weld.
Depth of fusion into the base metal. (Correct answer)
Surface finish quality.

Correct answer: Depth of fusion into the base metal.

Welding penetration refers to the depth to which the weld metal fuses into the base metal. Adequate penetration is crucial for achieving the required strength and integrity of the welded joint. Insufficient penetration can lead to weak welds that are prone to failure under stress.

Question 25: According to most industrial RT codes, the acceptable density range for radiographs examined on a standard illuminator is approximately:

0.5–1.0
4.5–6.0
0.1–0.5
1.8–4.0 (Correct answer)

Correct answer: 1.8–4.0

ASME and AWS codes generally require film densities between 1.8 and 4.0 in the area of interest to ensure adequate image quality.

Question 26: Which document section of a radiographic test report typically records the source-to-film distance (SFD)?

Personnel qualifications
Technique parameters (Correct answer)
Accept/reject summary
Indication description

Correct answer: Technique parameters

SFD is a technique parameter that affects geometric unsharpness and must be recorded in the technique section of the RT report.

Question 27: When a CRI professional encounters an unfamiliar challenge in contrast & exposure parameters, what is the recommended first course of action?

Proceed based on personal intuition alone
Postpone addressing the issue indefinitely
Research applicable standards, consult with subject matter experts, and document the approach (Correct answer)
Apply the solution used for the most recent similar problem without adaptation

Correct answer: Research applicable standards, consult with subject matter experts, and document the approach

Professional practice requires a methodical approach to unfamiliar challenges: research the applicable standards, consult experts when needed, and document the reasoning for the chosen approach.

Question 28: Which welding technique involves weaving the electrode or torch from side to side while progressing along the joint?

Whip technique
Backhand technique
Weave bead technique (Correct answer)
Stringer bead technique

Correct answer: Weave bead technique

The weave bead technique involves oscillating the electrode transversely across the joint while advancing, producing a wider bead and more fusion at the weld toes.

Question 29: A 'burn-through' in a weld radiograph is identified by which image characteristic?

A light density band along the weld centerline
Multiple small rounded dark spots clustered together
An isolated very dark (high density) rounded or elongated area at the weld root (Correct answer)
A straight dark line parallel to the weld axis

Correct answer: An isolated very dark (high density) rounded or elongated area at the weld root

Burn-through appears as a very dark high-density area at the root because excess penetration creates a void or depression that allows more radiation through.

Question 30: A CRI report references 'IQI sensitivity achieved.' What does this statement confirm?

The required image quality has been demonstrated on the radiograph (Correct answer)
The film density is within required limits
The exposure time was properly calculated
The radiation source was correctly selected

Correct answer: The required image quality has been demonstrated on the radiograph

IQI (image quality indicator) sensitivity achieved means the required wire or hole is visible, confirming adequate radiographic technique and image quality.

Question 31: When radiographing a tapered weld with significant thickness variation, the most appropriate technique to achieve acceptable density across the entire area is:

Use the lowest possible kVp for maximum contrast
Perform multiple exposures at different film placements
Increase mAs to its maximum value
Use a higher kVp or compensating filters to accommodate thickness variation (Correct answer)

Correct answer: Use a higher kVp or compensating filters to accommodate thickness variation

Higher kVp increases the exposure latitude, allowing acceptable density across a range of thicknesses in a single exposure.

Question 32: In the characteristic curve (H&D curve) of a radiographic film, the 'gamma' value represents:

The fog level of the unexposed film
The minimum detectable radiation energy
The slope of the straight-line portion of the curve, indicating inherent film contrast (Correct answer)
The reciprocity law failure factor for the film

Correct answer: The slope of the straight-line portion of the curve, indicating inherent film contrast

Gamma (gradient) is the slope of the linear portion of the H&D curve; a steeper slope means higher inherent contrast for a given exposure difference.

Question 33: Which of the following best describes a key competency required for contrast & exposure parameters in CRI practice?

Memorization of all relevant regulations without understanding context
Reliance on a single methodology for all situations
Strong analytical skills combined with effective communication and ethical judgment (Correct answer)
The ability to work independently without any oversight

Correct answer: Strong analytical skills combined with effective communication and ethical judgment

CRI professionals working in contrast & exposure parameters need analytical skills to assess situations, communication skills to convey findings, and ethical judgment to make sound decisions.

Question 34: In plasma arc welding (PAW), what distinguishes the plasma from the shielding gas?

Plasma gas is inert; shielding gas is reactive
Plasma gas is used only at high currents
Shielding gas is ionized; plasma gas is not
Plasma gas passes through the constricting nozzle orifice; shielding gas surrounds the outer cup (Correct answer)

Correct answer: Plasma gas passes through the constricting nozzle orifice; shielding gas surrounds the outer cup

In PAW, the plasma gas (typically argon) is forced through a constricting orifice to create the plasma column, while the shielding gas flows through the outer cup to protect the weld pool.

Question 35: What is the most effective way to measure success in report writing & documentation within CRI professional practice?

Count only the number of activities completed
Rely solely on supervisor opinion
Compare only with industry averages without considering context
Use a combination of quantitative metrics, qualitative assessments, and stakeholder feedback aligned with defined objectives (Correct answer)

Correct answer: Use a combination of quantitative metrics, qualitative assessments, and stakeholder feedback aligned with defined objectives

Effective measurement combines multiple data sources — quantitative metrics, qualitative assessments, and stakeholder feedback — all aligned with clearly defined objectives for a comprehensive evaluation.

Question 36: A radiograph of a fillet weld shows a dark line exactly at the root. This is most likely:

Incomplete root fusion or root crack (Correct answer)
Slag inclusion in the weld cap
Undercut at the weld toe
A transverse crack

Correct answer: Incomplete root fusion or root crack

A dark line at the fillet weld root indicates either incomplete root fusion or a root crack, both creating a gap at the tightest point of the joint.

Question 37: What is the purpose of using a lead back screen during film radiography of welds?

To increase the kV required for the exposure
To improve geometric sharpness by widening the focal spot
To increase the primary radiation dose to the film
To reduce backscatter radiation that can degrade image quality (Correct answer)

Correct answer: To reduce backscatter radiation that can degrade image quality

A lead back screen absorbs backscatter radiation from objects behind the film cassette, preventing it from fogging the film and degrading image contrast.

Question 38: A survey meter reads 40 mR/hr at 5 feet from a source. Using the inverse square law, what is the approximate dose rate at 10 feet?

10 mR/hr (Correct answer)
5 mR/hr
80 mR/hr
20 mR/hr

Correct answer: 10 mR/hr

Doubling the distance reduces intensity by a factor of 4 (2²), so 40 mR/hr ÷ 4 = 10 mR/hr.

Question 39: When evaluating a radiograph for acceptance, the interpreter must compare findings against:

The client's verbal instructions only
Their personal judgment of defect severity
The applicable code or standard acceptance criteria (Correct answer)
A general radiographic atlas of discontinuities

Correct answer: The applicable code or standard acceptance criteria

Acceptance or rejection of discontinuities must be based on the written acceptance criteria of the applicable code, standard, or specification.

Question 40: In the context of CRI certification, what is the most important consideration when implementing contrast & exposure parameters?

Completing implementation as quickly as possible regardless of quality
Minimizing documentation to save time
Ensuring alignment with established standards, stakeholder needs, and best practices (Correct answer)
Delegating all responsibilities to junior staff

Correct answer: Ensuring alignment with established standards, stakeholder needs, and best practices

When implementing contrast & exposure parameters, CRI professionals must ensure alignment with industry standards and stakeholder needs. Hasty implementation without proper planning often leads to compliance issues and suboptimal outcomes.

Question 41: In computed radiography (CR), the exposure indicator value primarily reflects:

The sensitivity class of the phosphor screen
The amount of radiation that exposed the imaging plate (Correct answer)
The processed image contrast setting
The radiation dose delivered to the patient or object

Correct answer: The amount of radiation that exposed the imaging plate

The exposure indicator (EI) in CR systems is a measure of the radiation exposure received by the imaging plate, used to assess if exposure was adequate.

Question 42: What does 'pass' refer to in a multipass weld procedure?

The voltage setting for the entire weld
A single progression of welding along the joint (Correct answer)
The total number of electrodes used
The inspection step after welding

Correct answer: A single progression of welding along the joint

A weld pass is a single progression of welding along a joint, and multiple passes are used to fill joints that require more than one layer of weld metal.

Question 43: A radiographer discovers their TLD badge was left in the vehicle during an exposure. The correct action is to:

Estimate dose and add to records
Subtract from the next month's reading
Report the badge as lost/damaged and follow the employer's anomalous dosimetry procedure (Correct answer)
Treat the dose as zero for that period

Correct answer: Report the badge as lost/damaged and follow the employer's anomalous dosimetry procedure

A badge not worn during an exposure is treated as a dosimetry anomaly; the employer must follow NRC-required procedures for estimating and recording dose.

Question 44: A report states 'indication at 2-4T.' What does the 'T' reference indicate?

The indication location is expressed as a multiple of material thickness (Correct answer)
The type of indication is a transverse crack
The test was performed at 2 to 4 Tesla magnetic field strength
The indication is located near the top surface of the material

Correct answer: The indication location is expressed as a multiple of material thickness

In radiographic reports, 'T' denotes material thickness; '2-4T' means the indication is located between two and four times the material thickness from a reference datum.

Question 45: The mAs (milliampere-seconds) value in radiography controls primarily:

The effective focal spot size of the X-ray tube
The total quantity of X-ray photons (radiation dose to the film) (Correct answer)
The energy spectrum width of the X-ray beam
The maximum energy of X-ray photons produced

Correct answer: The total quantity of X-ray photons (radiation dose to the film)

mAs determines the total number of X-ray photons produced during an exposure, directly controlling film density (quantity of radiation) rather than photon energy.

Question 46: What is the primary function of a scintillator layer in an indirect flat-panel detector?

Amplify the electrical signal before analog-to-digital conversion
Convert X-rays into visible light for photodiode capture (Correct answer)
Convert X-rays directly into electrical charge
Filter scattered radiation before image capture

Correct answer: Convert X-rays into visible light for photodiode capture

In indirect flat-panel detectors, the scintillator (commonly cesium iodide) converts X-ray photons into visible light, which is then captured by a photodiode array.

Question 47: What is the purpose of a 'step-wedge' sensitometric strip in radiographic film quality control?

To monitor film processor performance over time (Correct answer)
To calibrate the densitometer light source
To measure source activity
To verify developer chemical concentration

Correct answer: To monitor film processor performance over time

Daily sensitometric strips processed under standard conditions allow trending of developer activity, temperature, and replenishment rate to detect processor drift.

Question 48: What is the main purpose of shielding gas in welding?

To add color to the weld.
To protect the weld pool from oxygen and nitrogen. (Correct answer)
To cool the weld quickly.
To heat the base metal.

Correct answer: To protect the weld pool from oxygen and nitrogen.

Shielding gas is essential in welding to protect the molten weld pool from atmospheric contamination. Oxygen and nitrogen from the air can react with the hot metal, leading to defects like porosity, brittleness, and reduced strength. The inert gas creates a protective envelope, ensuring a clean and strong weld.

Question 49: What condition defines a 'High Radiation Area' under NRC regulations?

Dose rate exceeds 5 mSv/hr at 30 cm
Dose rate exceeds 1 mSv/hr at 30 cm (Correct answer)
Dose rate exceeds 0.02 mSv/hr at 30 cm
Any area requiring dosimetry

Correct answer: Dose rate exceeds 1 mSv/hr at 30 cm

A High Radiation Area is defined as any area where dose rates can exceed 1 mSv/hr (100 mrem/hr) at 30 cm from the source or surface.

Question 50: Which of the following best describes a key competency required for report writing & documentation in CRI practice?

Strong analytical skills combined with effective communication and ethical judgment (Correct answer)
Memorization of all relevant regulations without understanding context
The ability to work independently without any oversight
Reliance on a single methodology for all situations

Correct answer: Strong analytical skills combined with effective communication and ethical judgment

CRI professionals working in report writing & documentation need analytical skills to assess situations, communication skills to convey findings, and ethical judgment to make sound decisions.

Question 51: In digital radiography (DR), what is the primary advantage of the wider dynamic range compared to film?

DR images have higher spatial resolution than Class 1 film
DR can capture useful diagnostic information across a much broader range of exposures (Correct answer)
DR automatically corrects for scatter radiation without collimation
DR eliminates the need for proper source-to-detector distance control

Correct answer: DR can capture useful diagnostic information across a much broader range of exposures

Digital detectors have a much wider dynamic range than film, meaning they can record diagnostic information across a broader range of exposure levels in a single image.

Question 52: What is the correct term for referencing the radiographic film's identification markers in a report?

Exposure markers
Lead letters
Film stamps
Radiograph identification system (Correct answer)

Correct answer: Radiograph identification system

The radiograph identification system—including job number, weld number, location markers, and date—must be documented to ensure each image is uniquely traceable.

Question 53: Which ASME acceptance standard applies to radiographic examination of pressure vessel welds fabricated under Section VIII Division 1?

Section IX QW-191
AWS D1.1 Clause 6
UW-51 and UW-52 (Correct answer)
B31.3 Table 341.3.2

Correct answer: UW-51 and UW-52

ASME Section VIII Division 1 paragraphs UW-51 (spot RT) and UW-52 (full RT) govern acceptance criteria for pressure vessel weld radiographs.

Question 54: Cold lap (overlap) in a weld radiograph appears as which characteristic image feature?

A dark, irregular line along the weld toe with smooth edges (Correct answer)
A cluster of round dark spots
Parallel dark lines through the full weld thickness
A light density area near the weld crown

Correct answer: A dark, irregular line along the weld toe with smooth edges

Cold lap appears as a dark irregular line at the weld toe representing unfused metal that has rolled over without bonding.

Question 55: ASME and ASTM standards for industrial radiography typically require film density in the area of interest to fall within:

0.1 to 0.5 optical density units
1.8 to 4.0 optical density units (Correct answer)
0.5 to 1.5 optical density units
4.5 to 6.0 optical density units

Correct answer: 1.8 to 4.0 optical density units

Most industrial RT standards require density in the range of approximately 1.8 to 4.0, ensuring adequate blackening for visibility while avoiding over-exposure.

Question 56: Film darkroom safelights used during radiographic film processing must be verified using a:

Step-wedge sensitometric strip
Radiation survey meter
Densitometer check on processed film
Coin or paper fog test (Correct answer)

Correct answer: Coin or paper fog test

The coin or paper fog test checks whether safelight conditions cause measurable fog on unexposed film, ensuring darkroom integrity.

Question 57: When documenting scattered radiation artifacts on a radiograph, the CRI should:

Reject the radiograph and require a new exposure with proper backscatter protection (Correct answer)
Report the artifact only if it covers more than 25% of the weld image
Accept the film if the artifact does not overlap the weld area of interest
Note the artifact but proceed with interpretation ignoring affected areas

Correct answer: Reject the radiograph and require a new exposure with proper backscatter protection

Backscatter artifacts that could mask indications invalidate the radiograph; re-exposure with proper lead backing is required to ensure a valid examination.

Question 58: A radiographic report notes 'ESG' next to an indication. What does 'ESG' most likely stand for?

Estimated Slag Groove
Elongated Spherical Gas (porosity) (Correct answer)
Embedded Sub-surface Gap
External Surface Geometry

Correct answer: Elongated Spherical Gas (porosity)

ESG (Elongated Spherical Gas) or elongated gas porosity is a specific porosity type that must be identified by type in the radiographic report.

Question 59: The H&D (Hurter and Driffield) curve of a radiographic film is used to:

Determine the safe handling temperature for film storage
Measure the radiation energy spectrum of the source
Calculate the required source-to-film distance
Relate optical density to relative exposure and determine contrast characteristics (Correct answer)

Correct answer: Relate optical density to relative exposure and determine contrast characteristics

The H&D curve (characteristic curve) plots optical density versus log relative exposure, revealing the film's speed, contrast (gamma), and latitude.

Question 60: When a radiographic report must be revised after final sign-off, what is the correct documentation practice?

Discard the original and issue a new report with the same number
Issue a revised report with a new revision identifier and retain the original (Correct answer)
Cross out errors with a single line, initial, and date, then add the correction
Use correction fluid to remove the error before correcting

Correct answer: Issue a revised report with a new revision identifier and retain the original

Revisions require a new revision level (e.g., Rev. 1) while the original is retained, creating a complete audit trail per quality system requirements.

Question 61: According to AWS D1.1, what is the maximum allowable length of an individual porosity indication in a complete joint penetration groove weld?

1/2 inch (12.7 mm)
3/8 inch (9.5 mm) (Correct answer)
5/16 inch (7.9 mm)
1/4 inch (6.4 mm)

Correct answer: 3/8 inch (9.5 mm)

AWS D1.1 limits individual porosity indications in CJP groove welds to a maximum of 3/8 inch (9.5 mm) in diameter.

Question 62: In X-ray tomosynthesis, compared to full CT, the main trade-off is:

Tomosynthesis cannot image metallic components
Tomosynthesis requires higher radiation dose than full CT
Tomosynthesis provides better in-plane resolution but limited depth resolution due to incomplete angular sampling (Correct answer)
Tomosynthesis provides better depth resolution but worse in-plane resolution

Correct answer: Tomosynthesis provides better in-plane resolution but limited depth resolution due to incomplete angular sampling

Tomosynthesis acquires projections over a limited arc (e.g., 15–40°), giving excellent in-plane resolution but poor depth (z-axis) resolution with residual out-of-plane blur.

Question 63: A radiation worker receives a skin dose of 300 mSv in one year. How does this compare to the regulatory limit?

It is within the limit of 500 mSv (Correct answer)
It equals the limit of 300 mSv
It exceeds the limit of 250 mSv
It exceeds the limit of 150 mSv

Correct answer: It is within the limit of 500 mSv

The NRC annual skin dose limit is 500 mSv (50 rem), so 300 mSv is within regulatory limits.

Question 64: When comparing Class 1 and Class 4 industrial radiographic films, which statement is correct?

Class 1 has finer grain and higher contrast but requires more exposure than Class 4 (Correct answer)
Class 4 has finer grain and higher contrast than Class 1
Class 4 requires more exposure but produces higher resolution images
Class 1 and Class 4 have similar grain sizes but different speed

Correct answer: Class 1 has finer grain and higher contrast but requires more exposure than Class 4

Class 1 films are fine-grain, high-contrast films that require significantly more exposure than the faster Class 4 films.

Question 65: In digital radiography, what is the primary purpose of a flat-field correction?

To sharpen edge definition
To reduce image noise
To increase image contrast
To compensate for non-uniform detector response and sensitivity (Correct answer)

Correct answer: To compensate for non-uniform detector response and sensitivity

Flat-field correction normalizes pixel response across the detector panel, compensating for variations in detector element sensitivity and beam intensity distribution.

Question 66: Which digital radiography system component is responsible for converting the analog video signal from an image intensifier into a digital format?

Charge-coupled device (CCD) camera coupled with an analog-to-digital converter (ADC) (Correct answer)
Amorphous selenium photoconductor layer
Thin-film transistor (TFT) array
Storage phosphor plate reader laser

Correct answer: Charge-coupled device (CCD) camera coupled with an analog-to-digital converter (ADC)

In image intensifier-based digital fluoroscopy, a CCD camera captures the output phosphor image and an ADC converts the analog signal to digital pixel values.

Question 67: In pipeline girth weld radiography, what is the purpose of the 'back-scatter' lead marker ('B') placed behind the film?

To identify the technician performing the examination
To detect radiation scattered from behind the film that could degrade image quality (Correct answer)
To measure source-to-film distance
To mark the weld start location

Correct answer: To detect radiation scattered from behind the film that could degrade image quality

If the 'B' marker appears as a light image on the radiograph, back-scatter is excessive and the exposure must be repeated with added back-scatter shielding.

Question 68: When scatter radiation reaches the film/detector, the primary effect on the radiographic image is:

Increased sensitivity to small discontinuities
Increased sharpness of discontinuity edges
Reduced contrast due to non-image-forming exposure (Correct answer)
Improved density in thin sections of the part

Correct answer: Reduced contrast due to non-image-forming exposure

Scatter adds a uniform fog exposure to the film that reduces the density difference between areas of different thicknesses, lowering overall contrast.

Question 69: What is the significance of recording 'film type' in an RT report?

It is required only for gamma-ray sources, not X-ray
It documents the film speed class, which affects sensitivity and resolution of the image (Correct answer)
It identifies the brand preference of the radiographer
It records only the film size used for the exposure

Correct answer: It documents the film speed class, which affects sensitivity and resolution of the image

Film type (e.g., Class I, II, or III per ASTM E1815) determines the film's speed and granularity, directly affecting image quality and must be documented per technique records.

Question 70: In radiographic interpretation, subject contrast is primarily affected by:

Film processing temperature
Film base + fog density
Darkroom illumination
Differences in material thickness and density (Correct answer)

Correct answer: Differences in material thickness and density

Subject contrast arises from differences in thickness, density, and atomic number of the material being radiographed.

Question 71: A wire-type Image Quality Indicator (IQI) placed on the source side of a weld demonstrates that the radiographic technique is sensitive enough to detect:

Only surface-breaking cracks perpendicular to the beam
A wire of specified diameter, indicating minimum detectable discontinuity size (Correct answer)
All discontinuities regardless of orientation
Volumetric discontinuities only, not planar flaws

Correct answer: A wire of specified diameter, indicating minimum detectable discontinuity size

The visible wire in the IQI confirms that the technique has sufficient sensitivity to detect a discontinuity of that wire's diameter under the given exposure conditions.

Question 72: On a radiograph of a weld, an elongated dark indication running parallel to the weld axis most likely represents which discontinuity?

Tungsten inclusion
Lack of fusion
Porosity
Longitudinal crack or incomplete penetration (Correct answer)

Correct answer: Longitudinal crack or incomplete penetration

Elongated dark indications parallel to the weld axis are characteristic of longitudinal cracks or incomplete root penetration, which create planar voids aligned with the weld direction.

Question 73: In a radiographic report, what is the purpose of recording the 'object-to-film distance' (OFD)?

To determine geometric unsharpness and magnification (Correct answer)
To confirm the correct penetrameter was used
To calculate the required film type
To establish the minimum source strength needed

Correct answer: To determine geometric unsharpness and magnification

OFD is used in the geometric unsharpness formula (Ug = f × OFD/SFD) and affects image magnification, making it a critical documented parameter.

Question 74: When a gamma-ray source (e.g., Ir-192) is used instead of an X-ray machine, which parameter comparison is most accurate?

Gamma sources have adjustable energy, similar to kVp on X-ray machines
Gamma sources produce lower energy radiation than most X-ray machines used for steel
Ir-192 produces softer radiation more suitable for thin aluminum sections
Ir-192 emits radiation comparable in energy to X-rays produced at approximately 450–600 kVp (Correct answer)

Correct answer: Ir-192 emits radiation comparable in energy to X-rays produced at approximately 450–600 kVp

Ir-192 emits gamma rays with average energy around 350 keV, which is comparable in penetrating ability to X-rays generated at approximately 450–600 kVp.

Question 75: What is the primary reason that helical (spiral) weld seams in pipe require special consideration when planning radiographic examination?

Spiral welds always require gamma ray sources
Spiral welds are exempt from radiographic examination
The weld angle to the pipe axis affects the projection geometry and requires angled source placement to maintain proper coverage (Correct answer)
The weld is too short for IQI placement

Correct answer: The weld angle to the pipe axis affects the projection geometry and requires angled source placement to maintain proper coverage

The helical angle of a spiral weld means a straight radiographic beam would not be perpendicular to the weld plane, requiring angled source placement to properly image the weld cross-section.

Question 76: Which radiographic parameter most directly controls the energy of X-rays and thus penetrating power?

Source-to-film distance
Exposure time
Kilovoltage peak (kVp) (Correct answer)
Milliamperage (mA)

Correct answer: Kilovoltage peak (kVp)

kVp controls the maximum energy of X-ray photons, directly affecting their ability to penetrate the material being examined.

Question 77: Which factor primarily determines the degree of geometric unsharpness (Ug) in a radiographic image?

Type of intensifying screen employed
Film grain size and development time
kVp setting and filtration used
Source (focal spot) size, object-to-film distance, and source-to-object distance (Correct answer)

Correct answer: Source (focal spot) size, object-to-film distance, and source-to-object distance

Geometric unsharpness (Ug = f × b/a) depends on the effective focal spot size (f), object-to-film distance (b), and source-to-object distance (a).

Question 78: Which tomographic reconstruction algorithm is most commonly used in industrial CT scanning due to its computational efficiency?

Algebraic reconstruction technique (ART)
Iterative reconstruction
Filtered back projection (FBP) (Correct answer)
Maximum likelihood expectation maximization

Correct answer: Filtered back projection (FBP)

Filtered back projection is the dominant algorithm in industrial CT because it offers fast reconstruction with well-understood artifacts and adequate image quality.

Question 79: The 'inverse square law' states that radiation intensity is inversely proportional to:

The square of the distance from the source (Correct answer)
Source activity
Exposure time
Film speed

Correct answer: The square of the distance from the source

Radiation intensity decreases with the square of the distance: doubling the distance reduces intensity to one-quarter of its original value.

Question 80: In flash radiography used for ballistics or explosion studies, the X-ray pulse duration must be on the order of:

Milliseconds (1–10 ms)
Microseconds or nanoseconds to freeze high-speed motion (Correct answer)
Minutes for high-resolution imaging
Seconds for adequate exposure

Correct answer: Microseconds or nanoseconds to freeze high-speed motion

Flash radiography uses extremely short X-ray pulses (nanosecond to microsecond range) to freeze the motion of objects moving at thousands of meters per second.

Question 81: What radiographic artifact appears as a fine, repetitive grid-like pattern overlaid on the image and is caused by interference between the anti-scatter grid and the detector matrix?

Lag artifact
Quantum mottle
Moiré artifact (Correct answer)
Ghosting artifact

Correct answer: Moiré artifact

Moiré artifacts result from the spatial frequency beat between the grid lines and the detector pixel matrix, producing a visible interference pattern on the image.

Question 82: Which radiographic artifact appears as a light crescent-shaped mark caused by bending film sharply?

Fog
Static mark
Scratch artifact
Crimp mark (Correct answer)

Correct answer: Crimp mark

Crimp marks are crescent-shaped light or dark artifacts produced by bending or kinking the film before or during processing.

Question 83: Which element is NOT typically required in the final sign-off section of an RT report per NDE Level III standards?

Customer's approval signature (Correct answer)
Employer's name or stamp
Interpreter's signature and date
Interpreter's certification level

Correct answer: Customer's approval signature

RT reports are certified by the qualified NDE interpreter; customer approval signatures are a contractual matter, not a standard NDE documentation requirement.

Question 84: What is undercut in welding?

A groove at the weld toe reducing cross-section. (Correct answer)
A crack in the weld.
Gas pockets inside the weld.
Excess weld metal.

Correct answer: A groove at the weld toe reducing cross-section.

Undercut in welding is a groove melted into the base metal adjacent to the weld toe or root, which reduces the effective thickness of the base metal. This reduction in cross-section weakens the joint and can act as a stress concentrator, potentially leading to fatigue failure. It is often caused by excessive arc voltage or travel speed.

Question 85: Which technique is used to reduce scatter radiation reaching the film when radiographing large, thick steel components?

Increasing the source-to-film distance without any shielding
Selecting a faster film class to reduce required exposure time
Increasing the kVp to harden the beam
Using lead diaphragms, collimators, or masking to limit beam area (Correct answer)

Correct answer: Using lead diaphragms, collimators, or masking to limit beam area

Collimators, diaphragms, and lead masking restrict the X-ray beam to only the area of interest, reducing the volume of material producing scatter.

Question 86: What distinguishes 'lack of fusion' from 'lack of penetration' in a radiographic image?

Lack of penetration appears only in fillet welds
Lack of fusion appears as a dark linear indication along the fusion line rather than at the weld centerline (Correct answer)
Lack of fusion is always lighter in density
They are indistinguishable radiographically

Correct answer: Lack of fusion appears as a dark linear indication along the fusion line rather than at the weld centerline

Lack of fusion is located at the sidewall or interpass fusion line and appears as an off-center dark line, while lack of penetration is centered at the root.

Question 87: What does documenting the 'viewing conditions' in an RT report provide?

A record of the room temperature during film review
Assurance that ambient lighting and viewer luminance met the standard required for proper interpretation (Correct answer)
Evidence that the interpreter was comfortable during review
Proof that the report was written under supervision

Correct answer: Assurance that ambient lighting and viewer luminance met the standard required for proper interpretation

Proper viewing conditions (e.g., adequate luminance per ASTM E2597 / ASME T-262) are required for reliable interpretation; documentation confirms this requirement was met.

Question 88: When evaluating a radiograph, increasing kVp while keeping mAs constant will generally:

Increase both contrast and density equally
Decrease image contrast and increase density (Correct answer)
Increase image contrast and decrease density
Have no effect on film density

Correct answer: Decrease image contrast and increase density

Higher kVp produces more penetrating radiation, reducing differential absorption and lowering subject contrast while increasing overall film density.

Question 89: How should CRI professionals handle confidential information related to report writing & documentation?

Follow established protocols for data protection, access control, and disclosure in accordance with applicable regulations (Correct answer)
Delete all records after project completion
Share freely with all colleagues for transparency
Store information without any security measures

Correct answer: Follow established protocols for data protection, access control, and disclosure in accordance with applicable regulations

Confidential information must be handled according to established protocols, regulatory requirements, and professional ethics standards, including proper access control and disclosure procedures.

Question 90: A CRI report must include the 'radiographic technique' used. Which combination of entries satisfies this requirement?

Source type and kV or Ci only
Source type, source size, film type, SFD, IQI type, and IQI placement (Correct answer)
Source type, film brand, and exposure time only
Film density, IQI sensitivity, and acceptance criteria only

Correct answer: Source type, source size, film type, SFD, IQI type, and IQI placement

A complete technique record includes source type and size, film type, SFD, IQI type and placement, and other parameters needed to reproduce or audit the examination.

Question 91: Which ASTM standard governs reference radiographs for steel castings?

ASTM E94
ASTM E186 (Correct answer)
ASTM E747
ASTM E155

Correct answer: ASTM E186

ASTM E186 provides reference radiographs for heavy-walled (2–4.5 in.) steel castings.

Question 92: A longer source-to-film distance (SFD) in radiography primarily results in:

Higher radiation dose to the film
Increased geometric unsharpness
Increased scatter radiation reaching the film
Decreased geometric unsharpness (Correct answer)

Correct answer: Decreased geometric unsharpness

Increasing SFD reduces the penumbra (geometric unsharpness) because the radiation source subtends a smaller angle at the object.

Question 93: Which discontinuity type is generally considered MOST detrimental to weld structural integrity under cyclic loading?

Porosity
Cracks (Correct answer)
Slag inclusions
Undercut

Correct answer: Cracks

Cracks are the most critical discontinuity under cyclic loading because their sharp tips act as stress concentrators that propagate under fatigue.

Question 94: What effect does increasing the source-to-film distance (SFD) have on a weld radiograph?

Decreases geometric unsharpness and improves definition (Correct answer)
Increases geometric unsharpness
Has no effect on image sharpness
Increases the required kV to maintain contrast

Correct answer: Decreases geometric unsharpness and improves definition

Increasing SFD reduces the penumbra (geometric unsharpness) by making the divergence angle smaller, resulting in a sharper radiographic image.

Question 95: When evaluating a radiograph for acceptance, the radiographer notes the IQI image is NOT visible. What action is required?

Use a higher-sensitivity IQI for re-evaluation
Reject the radiograph and repeat with adjusted technique until IQI is visible (Correct answer)
Accept the radiograph if density is within range
Note the IQI absence in the report and accept conditionally

Correct answer: Reject the radiograph and repeat with adjusted technique until IQI is visible

IQI visibility is a mandatory acceptance criterion; if the required IQI or wire cannot be seen, the technique has not demonstrated sufficient sensitivity and the radiograph must be retaken.

Question 96: In industrial radiography, what is the primary purpose of using lead screens with X-ray film?

To reduce the required kVp setting
To protect the film from physical damage
To filter scatter radiation and intensify the direct beam effect (Correct answer)
To increase scatter radiation and improve contrast

Correct answer: To filter scatter radiation and intensify the direct beam effect

Lead screens absorb scatter radiation (improving contrast) and emit photoelectrons that intensify the film's response to the primary beam.

Question 97: For radiographic examination of pipe welds per ASME B31.3, what is the minimum source-to-object distance (SOD) requirement relative to the source size?

The SOD must be at least 10 times the source diameter
The SOD is left entirely to the radiographer's discretion
The SOD must produce geometric unsharpness (Ug) no greater than 1/100 of the weld thickness or 0.020 inch, whichever is smaller (Correct answer)
The SOD must be at least 12 inches regardless of source size

Correct answer: The SOD must produce geometric unsharpness (Ug) no greater than 1/100 of the weld thickness or 0.020 inch, whichever is smaller

ASME B31.3 requires that geometric unsharpness not exceed the lesser of 1/100 of the weld thickness or 0.020 inch, which governs minimum SOD selection.

Question 98: A radiograph of a weld shows an image that is overall too dark (overexposed). To correct this while maintaining the same geometry, the interpreter would recommend:

Switching to a faster film class only
Increasing mAs or decreasing SFD
Decreasing mAs or increasing SFD (Correct answer)
Reducing the kVp while increasing mAs proportionally

Correct answer: Decreasing mAs or increasing SFD

Reducing mAs decreases the number of X-ray photons reaching the film, and increasing SFD reduces intensity per the inverse square law, both lightening the radiograph.

Question 99: The inverse square law in radiography states that radiation intensity varies:

Inversely with the square of the distance (Correct answer)
Directly with the square of the distance
Inversely with distance
Directly with distance

Correct answer: Inversely with the square of the distance

The inverse square law states that intensity is proportional to 1/d², so doubling the distance reduces intensity to one-quarter.

Question 100: What is the most effective way to measure success in contrast & exposure parameters within CRI professional practice?

Rely solely on supervisor opinion
Use a combination of quantitative metrics, qualitative assessments, and stakeholder feedback aligned with defined objectives (Correct answer)
Count only the number of activities completed
Compare only with industry averages without considering context

Correct answer: Use a combination of quantitative metrics, qualitative assessments, and stakeholder feedback aligned with defined objectives

AWS Certified Radiographic Interpreter (CRI)

The AWS CRI certification validates expertise in evaluating weld quality through radiographic testing, covering general radiographic knowledge, applicable code standards, and practical film interpretation per AWS QC15.

100

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180 min

Time Limit

70%

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