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隣接モニタリングポストでの線量率変動の相関性を利用した降雨時における施設放出寄与の定量化検討

Discrimination of the variation of ambient radiation dose rate due to radioactivity discharged from nuclear facility during rainfall by using the correlation between the variations observed at neighboring monitoring posts

竹安 正則; 菅井 将光*; 小沼 利光; 武石 稔; 松浦 賢一

Takeyasu, Masanori; Sugai, Masamitsu*; Onuma, Toshimitsu; Takeishi, Minoru; Matsuura, Kenichi

降雨時の大気中ラドン壊変生成物の地表沈着による空間線量率の上昇は、原子力施設からの放射能放出に伴う線量率上昇を弁別するうえで妨害因子となっている。本研究では、降雨時に隣接したモニタリングポストでの線量率変動の相関関係を利用して降雨時における施設放出寄与分を定量化した。そして、東海再処理施設から放出されたKr-85による、降雨時の線量率寄与分の弁別を試みたので、その結果について報告する。

The variation of ambient radiation dose rate due to the ground deposition of atmospheric radon decay products during rainfall becomes an interference factor, when the variation of the dose rate due to radioactivity discharge from nuclear facility is discriminated. In this study, the variation due to the radioactivity discharge facilities during rainfall was quantified by using the correlation relationship of the variation of the dose rate observed neighboring monitoring posts during rainfall.

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