放射性硫化水素ガス (H235S) に対する活性炭素繊維フィルタ捕集効率の評価法

概要

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Various kinds of 35S-labeled compound are produced in the Radioisotope Production Laboratory at JAERI, and radioactive liquid waste containing 35S that resulted from the productions is stored in the radwaste tanks. The air in these tanks is contaminated by gaseous 35S and part of the air was exhausted from the stack as air effluent. Analysis by gas chromatography showed that the chemical form of 35S gas was H2S.Radioactive concentration of H235S gas in the air was measured by adsorbing it on activated carbon fiber filters (non-impregnated and TEDA-impregnated). Since the collection efficiency depends on collection condition, a method by using a ratio of the back side count rate of a filter to the front side one was developed to estimate the collection efficiency of the filter. Experimental results showed that the method is valid for the evaluation of collection efficiency.