T.O. 33B-1-16-63Figure 6-30. Effect of Development Time upon Film Speed, Contrast and Fogging.6.7.3 RadiographicSensitivity.6.7.3.1 Penetrameters.CAUTIONUse the IQI specified in the technique. Consult with the appropriate ALC NDTLevel III for instructions if the IQI identified in the technique is not available. IQI’sare not generally required for inspection for the presence of debris, for properassembly of components, for dissimilar material inspection, for honeycombstructures, or for the presence or absence of material.There is a need to be able to qualitatively define how sensitive a radiographic image is. The devices that achieve thisaim are known as penetrameters. Another description is image quality indicators (IQI). By whatever name, theyprovide an indication of what the film reader can be expected to see in the actual part being inspected. A wide range ofpenetrameters is specified for use by various industries. ASTM plaque-like type penetrameters (or as now morecommonly called image quality indicators) are described in Ref. 13. Wire penetrameters, particularly useful for weldinspection, are described in Ref. 14. In their current form, penetrameters are a small plaque, fabricated of the samematerial as that being radiographed. The thickness of the penetrameter is a known percent of the test object thickness.Holes in the penetrameter are of diameters 1T, 2T, and 4T when T equals penetrameter thickness. Thicknessvisualization of these holes can be related to the sensitivity of the radiographic image. A typical penetrameter is shownin Figure 6-31.
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