Why is leak testing required for sealed sources?

• A. To verify the source is active
• B. To ensure containment and protect personnel from internal exposure
• C. To check shielding integrity
• D. To schedule maintenance

Answer: (B)

Leak testing is performed to verify that the radioactive contents remain contained inside the sealed source. The key safety idea is preventing internal exposure to workers if the seal or encapsulation wears or is damaged; a leak would allow radioactive material to enter the body through ingestion or inhalation, which poses significant health risks. The test typically involves wiping a small area of the source and analyzing the wipe for any detectable contamination; if leakage is found, the source is taken out of service and replaced. This procedure isn’t about proving the source is still active, nor about assessing shielding, nor simply about scheduling maintenance.