CRI IQI Selection & Radiographic Sensitivity 1 — Questions and Answers
Question 1: What does IQI stand for in radiographic testing?
- Image Quality Indicator (Correct answer)
- Integrated Quality Index
- Inspection Quality Interface
- Image Quantification Instrument
Correct answer: Image Quality Indicator
IQI stands for Image Quality Indicator, a device placed on the test object to verify the quality and sensitivity of the radiographic technique.
Question 2: Which ASTM standard specifically covers hole-type (plaque) IQIs used in industrial radiography?
- ASTM E1025 (Correct answer)
- ASTM E747
- ASTM E94
- ASTM E1742
Correct answer: ASTM E1025
ASTM E1025 covers the design, manufacture, and material groups for hole-type (plaque) IQIs used in radiographic examination.
Question 3: On a hole-type IQI, what is the diameter of the 2T hole relative to the IQI thickness?
- Equal to twice the IQI thickness (Correct answer)
- Equal to the IQI thickness
- Equal to four times the IQI thickness
- Equal to half the IQI thickness
Correct answer: Equal to twice the IQI thickness
The 2T hole has a diameter equal to twice the nominal thickness of the IQI, establishing a standardized reference for sensitivity measurement.
Question 4: For single-wall radiography, hole-type IQI selection is based on which thickness measurement?
- Nominal single-wall thickness being radiographed (Correct answer)
- Total thickness including weld reinforcement
- Average of base metal and weld crown height
- Minimum wall thickness minus corrosion allowance
Correct answer: Nominal single-wall thickness being radiographed
IQI designation is selected from code tables based on the nominal single-wall thickness being radiographed, not including weld reinforcement.
Question 5: What does a radiographic sensitivity designation of '2-2T' indicate?
- The 2T essential hole in the IQI designated for that thickness range is visible (Correct answer)
- Two separate IQIs must both show visible holes
- The IQI is 2 inches thick with a 2T hole
- Two-percent exposure tolerance with a 2T hole reference
Correct answer: The 2T essential hole in the IQI designated for that thickness range is visible
The '2-2T' designation means the IQI number 2 (appropriate for the material thickness) and its 2T hole are both clearly visible on the radiograph.
Question 6: Which ASTM standard covers wire-type IQIs used in radiographic testing?
- ASTM E747 (Correct answer)
- ASTM E1025
- ASTM E94
- ASTM E1742
Correct answer: ASTM E747
ASTM E747 covers wire-type IQIs, defining wire diameters, materials, and sets for use in industrial radiographic examination.
Question 7: On which side of the test object should the IQI preferably be placed according to most radiographic codes?
- Source side of the object being radiographed (Correct answer)
- Film side of the object being radiographed
- Either side, depending on radiographer preference
- Perpendicular to the central beam axis
Correct answer: Source side of the object being radiographed
Source-side IQI placement is preferred because it subjects the IQI to the greatest geometric unsharpness, providing a conservative verification of technique sensitivity.
CRI IQI Selection & Radiographic Sensitivity 1
What does IQI stand for in radiographic testing?