The nuclear facilities at Risø National Laboratory are equipped with high-efficiency filters to protect the environment from routine or accidental releases of radioactive material. The filter efficiency must be tested regularly and a method for on-site control is described. It is based on injection of a radioactive sample in the filter duct, followed by sampling before and after the filter. HEPA-filters are tested with a 24NaCl-aerosol and charcoal filters with 131ICH3. Normally samples of 1 mCi are
used. Penetrations (1 - efficiency) can be determined with a relative uncertainty of 10-15%.
|Place of Publication||Roskilde|
|Publisher||Risø National Laboratory|
|Number of pages||43|
|Publication status||Published - 1986|
|Series||Denmark. Forskningscenter Risoe. Risoe-R|