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Application of topographical source model for air dose rates conversions in aerial radiation monitoring

航空機モニタリングにおける地形補正モデルの適用

石崎 梓 ; 眞田 幸尚  ; 石田 睦司; 宗像 雅広 

Ishizaki, Azusa; Sanada, Yukihisa; Ishida, Mutsushi; Munakata, Masahiro

福島第一原子力発電所事故後、空間線量率や放射性物質の沈着量の把握のため航空機モニタリングが実施されてきた。航空機モニタリングではヘリコプターに搭載された検出器を用いて地表面からの$$gamma$$線を計測し、空間線量率や放射性物質の沈着量に換算しているが、現行の換算手法では地表面を平坦と仮定している。そのため、地形の起伏が比較的大きな場所では変換誤差が生じる。本研究では地形の起伏を考慮した地形補正モデルを用いて実際の航空機モニタリング測定データを解析するとともに、従来法による結果と比較を行う。

After the Fukushima Daiichi Nuclear Power Station (FDNPS) accident in 2011, aerial radiation monitoring (ARM) using a manned helicopter was conducted to rapidly measure air dose rates and the deposition of radioactive nuclides over a large area. Typically, the air dose rate is obtained by conversion from the count rate using the conventional flat source model (FSM). The converted dose rate via aerial monitoring poorly matches the results of ground measurement in the mountain and forest areas because the FSM does not consider topographical effects. To improve the conversion accuracy, we developed new methods to analyze aerial monitoring data using the topographical source model (TSM) based on the analytical calculation of the $$gamma$$-ray flux. The ARM results converted using both the FSM as well as TSM were compared with ground measurement data obtained after the FDNPS accident. By using TSM, the conversion accuracy was improved.

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パーセンタイル:31.3

分野:Environmental Sciences

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