On-Site Test of Filters in Nuclear Facilities Using Radioactive Sodium Chloride ((24)Na)-Aerosol and Methyl Iodide ((131)I)
RISOE NATIONAL LAB ROSKILDE (DENMARK)
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The nuclear facilities at Risoe 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 Na24Cl-aerosol and charcoal filters with I131CH3. Normally samples of 1 mCi are used. Penetrations 1 - efficiency can be determined with a relative uncertainty of 10-15.
- Nuclear Radiation Shielding, Protection and Safety