CRI IQI Selection & Radiographic Sensitivity 3

Question 1

For a double-wall single-image (DWSI) technique, the IQI thickness designation is selected based on which thickness?

Accepted Answer

The nominal single-wall thickness of the wall being evaluated

Answer

The combined thickness of both walls in the radiation path

Answer

The average thickness of the two walls

Answer

The thicker of the two walls only

Question 2

When radiographing a carbon steel weld, which IQI material should be selected?

Accepted Answer

Steel IQI of radiographically similar composition to the test material

Answer

Aluminum IQI because it provides higher contrast

Answer

Titanium IQI for its superior density reference

Answer

Copper IQI for its consistent X-ray absorption properties

Question 3

What is the primary purpose of a step-wedge calibration film used in conjunction with radiographic examination?

Accepted Answer

To verify film density levels and confirm consistent film processing conditions

Answer

To replace the IQI when one is unavailable

Answer

To measure the geometric unsharpness of the radiographic setup

Answer

To calibrate the output intensity of the radiation source

Question 4

According to ASME Section V, what radiographic sensitivity level is typically required for pressure vessel weld examination?

Accepted Answer

2% sensitivity (2T essential hole must be visible)

Answer

1% sensitivity (1T essential hole must be visible)

Answer

4% sensitivity (4T essential hole must be visible)

Answer

0.5% sensitivity (sub-1T hole must be visible)

Question 5

An IQI with a designation number of 10 has what nominal thickness?

Accepted Answer

0.010 inches

Answer

0.100 inches

Answer

1.000 inches

Answer

0.001 inches

Question 6

Where must the IQI be positioned relative to the weld during radiographic examination?

Accepted Answer

On or adjacent to the weld within the area of interest being examined

Answer

At least 2 inches away from the weld to avoid image interference

Answer

Always at the center of the film, regardless of weld location

Answer

Outside the area of interest to prevent masking discontinuities

Question 7

What is the purpose of having three holes (1T, 2T, and 4T) on a standard hole-type IQI?

Accepted Answer

To provide multiple sensitivity reference levels, allowing verification at different degrees of detectability

Answer

To enable calibration of three different radiation energies in a single exposure

Answer

To simultaneously measure three different specimen thicknesses in one radiograph

Answer

To allow one IQI to replace three separate wire-type IQI sets