Page 921 - Radiation Safety

Procedure in Working with Sealed
Procedure in Working with Sealed

Sources
Sources

• Leak test

 Level of radiation leakage is determined based on the deviation of

measured dose from the dose of design leak.

 Purpose of leak test is to confirm the classification of sealed sources

and performance of irradiation machine is maintained at all times
during its use.

 Leaks due to defect of sealed sources, apparatus or machine must be
assessed periodically (interval is prescribed by the authority) or

whenever damage of the source (if radiation source, it is the capsule or
seal) is suspected, or when there is a presence of contamination
(allowable leaked activity = 185 Bq).