平衡等価ラドン濃度の簡便なスポット測定方法

Simple spot measurement method of equilibrium equivalent radon concentration

迫田 晃弘   ; 神崎 訓枝   ; 田中 裕史 

Sakoda, Akihiro; Kanzaki, Norie; Tanaka, Hiroshi

ラドンの被ばく評価において重要なのは子孫核種濃度であり、平衡等価ラドン濃度の情報が望まれる。本研究では、平衡等価ラドン濃度のスポット測定を対象に、簡便な評価手法を検討した。子孫核種の個別濃度比を仮定せずに、1回のアルファ線計測から平衡等価ラドン濃度に換算可能な検量線を導出した。既存のラドン子孫核種測定器との結果比較も行い、本評価手法の妥当性も評価した。

When radon exposure is assessed, equivalent equilibrium radon concentration (EERC) is much more important information than radon concentration itself. The present study focused on spot measurements of EERC to discuss its simple measurement method. Without any assumption of individual concentrations of radon progeny, it was attempted to develop the calibration curve between alpha counts given by a single counting and EERC. To validate this simple technique, the measurement result was compared with that provided by a commercially available device dedicated to radon progeny measurement.