According to Module 18, where should the IQI be placed on the specimen?

The placement of the Image Quality Indicator (IQI) is crucial in ensuring that the radiographic testing (RT) process effectively evaluates the quality of the radiograph produced. According to Module 18, the IQI should be placed on the source side of the specimen. This is because the primary purpose of the IQI is to evaluate the sensitivity and adequacy of the radiographic technique being used, which is directly influenced by the radiation exposure the IQI receives from the source.

When the IQI is on the source side, it is positioned in such a way that any potential indications within the material can be correlated with the clarity and detail of the radiograph. This allows for a more accurate assessment of the weld quality and detection of any defects, such as porosity or cracks. The positioning helps ensure that the contrast and resolution of these potential defects are suitable when analyzing the resulting radiographic image.

Other placement options do not align with the protocol required for accurate quality assessment in radiography. While placing the IQI on different sides of the specimen may seem plausible, it would not allow for the same level of effectiveness in evaluating the radiograph's performance and quality in relation to the actual material being inspected.