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  • 1 Japan Nuclear Cycle Development Institute Radiation Protection Division 319-1194 Tokai-mura, Naka-gun, Ibaraki Japan
  • | 2 Inspection Development Company Ltd. 319-1112 Tokai-mura, Naka-gun, Ibaraki Japan
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The effects of incorporating tritiated water into a 14C-sampling system in sample preparation and 14C activity measurement by liquid scintillation counting were investigated. Experiments derived the limit of water content in the prepared sample, and also demonstrated that 14C activity can be determined without any interference from 3H contamination for a clear-sample solution. The results enabled us to estimate the permissible relative humidity of air required for accomplishing sample preparation and 14C activity measurement. These showed that for sampling of air with less than the permissible relative humidity, total 14C activity in airborne effluent can be evaluated accurately without dehumidification of air.