The two penetrameter types are wire type and plaque type. Which option reflects the two types?

The two penetrameter types are wire type and plaque type. Which option reflects the two types?

• A. wire type and plaque type
• B. disk type and needle type
• C. block type and sheet type
• D. tube type and ring type

Answer: (A)

Penetrameters, or image quality indicators, are used in radiography to verify that the film has enough contrast and penetration for the material thickness. There are two standard forms: wire type and plaque type. The wire type uses a small wire embedded in a plate, so the radiograph shows a wire whose image corresponds to known diameters for reference. The plaque type uses a plate with a pattern of holes or slots of known sizes, producing reference densities on the film. Because these are the recognized categories, the correct pairing is wire type and plaque type. The other described shapes (disk, needle, block, sheet, tube, ring) aren’t the conventional penetrameter forms used for image quality indication.