ASNT IRRSP Practice Questions - ASNT Industrial Radiography Radiation Safety Personnel (IRRSP) Exam

Selenium-75 is typically chosen over Iridium-192 for radiography of which material range?

Steel thicker than 4 inches Concrete walls over 12 inches Thin steel and lighter alloys roughly 5-25 mm Lead castings only

Correct Answer:

Thin steel and lighter alloys roughly 5-25 mm

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