BS ISO 9978:2020 pdf free.Radiation protection- Sealed sources- Leakage test methods. BS ISO 9978 This document specifies the different leakage test methods for sealed sources. It gives a comprehensive set of procedures using radioactive and non-radioactive means.This document applies to the following situations:leakage testing of test sources following design classification testing in accordance with ISO 2919(1>;-production quality control testing of...