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

Which isotope has the longest half-life among common industrial radiography sources?

Iridium-192 (73.83 days) Cobalt-60 (5.27 years) Selenium-75 (119.78 days) Cesium-137 (30.07 years)

Correct Answer:

Cesium-137 (30.07 years)

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