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

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

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.