CRI Safety Standards & Quality Control 2 — Questions and Answers
Question 1: What is the primary purpose of a penetrameter (IQI) in radiographic testing?
- To measure radiation dose
- To indicate the sensitivity and quality of the radiograph (Correct answer)
- To calibrate the X-ray generator
- To determine film speed
Correct answer: To indicate the sensitivity and quality of the radiograph
A penetrameter (Image Quality Indicator) is placed on the source side of the test object to verify that the radiograph meets minimum sensitivity requirements.
Question 2: According to ASME Section V, the minimum source-to-film distance (SFD) is primarily governed by which factor?
- Film type selection
- Geometric unsharpness limits (Correct answer)
- Radiation output of the source
- Developer temperature
Correct answer: Geometric unsharpness limits
Minimum SFD is calculated to ensure geometric unsharpness (Ug) does not exceed the allowable limit specified in the applicable code.
Question 3: When using a wire-type IQI, the essential wire is the thinnest wire that must be:
- Visible anywhere on the radiograph
- Visible in the area of interest (Correct answer)
- Present but may be obscured
- Recorded only in the procedure
Correct answer: Visible in the area of interest
The essential wire must be visible in the area of interest on the radiograph to confirm that the required sensitivity has been achieved in that specific region.
Question 4: Which ASTM standard governs the selection and use of radiographic film for industrial applications?
- ASTM E747
- ASTM E1815 (Correct answer)
- ASTM E94
- ASTM E1742
Correct answer: ASTM E1815
ASTM E1815 classifies industrial radiographic films into categories (Class I through IV) based on speed and grain characteristics.
Question 5: A radiographic procedure requires 2-2T hole-type IQIs. The '2T' designation means:
- Two holes, each 2× the material thickness
- A hole diameter equal to 2× the IQI thickness (Correct answer)
- Two IQIs placed at 2-inch intervals
- IQI thickness is 2% of the part thickness
Correct answer: A hole diameter equal to 2× the IQI thickness
In the 2-2T designation, '2T' specifies that the essential hole has a diameter equal to twice the IQI plate thickness.
Question 6: What action is required when a radiograph's density falls outside the acceptable range per ASME Section V?
- Accept if IQI is visible
- Re-radiograph the area (Correct answer)
- Adjust density using software
- Document and accept with Level III approval
Correct answer: Re-radiograph the area
If film density does not meet the required range (typically 1.8–4.0 for X-ray), the area must be re-radiographed under corrected exposure conditions.
Question 7: Under 10 CFR Part 34, which document must be immediately available to radiographers during field operations?
- Employer's financial records
- Radiographic procedure qualification records
- Specific license or a copy thereof (Correct answer)
- Personnel dosimetry calibration certificates
Correct answer: Specific license or a copy thereof
10 CFR 34.43 requires that radiographers have the specific license or a copy available at each job site during radiographic operations.
CRI Safety Standards & Quality Control 2
What is the primary purpose of a penetrameter (IQI) in radiographic testing?