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A Step in the development of a radioactive inventory estimation system for TEPCO's Fukushima Daiichi NPS debris; Calculation/measurement of $$gamma$$-ray detection efficiencies

東京電力福島第一原子力発電所の放射能汚染瓦礫のインベントリ評価システムの開発に向けて; $$gamma$$線検出効率の計算と測定

古高 和禎; 奥村 啓介; 小嶋 健介; 羽倉 洋行; 岡本 力

Furutaka, Kazuyoshi; Okumura, Keisuke; Kojima, Kensuke; Hagura, Hiroyuki; Okamoto, Tsutomu

東京電力福島第一原子力発電所の事故で発生した放射性物質に汚染された瓦礫等の放射能濃度を効率的かつ合理的に評価するための技術開発を行っている。この技術では、体積線源からの$$gamma$$線検出効率を放射線輸送計算コードPHITSを用いて評価する。その第一段階として、PHITSにGe$$gamma$$線検出器の形状等の情報を入力し、点線源からの50-1450keVの$$gamma$$線に対する全エネルギー検出効率を計算するとともに、実測値との比較を行った。その結果、PHITSの計算結果に簡単なバイアス補正を施すことにより、距離・角度によらず、実測値を再現できることがわかった。

We are developing a system to estimate the radioactivity of the contaminated debris produced from the TEPCO's Fukushima Daiichi NPS accident to facilitate their reasonable and efficient managements and disposal. The system uses a radiation transport code PHITS to calculate detection efficiencies of the $$gamma$$-rays emitted from the debris with finite volumes. As its first step, information on a Ge $$gamma$$-ray detector such as its size and shape were input and the full-energy peak efficiencies were calculated in a energy range between 50-1450 keV. The efficiencies were also measured experimentally using several standard $$gamma$$-ray sources and compared to the results of the calculation. The comparison shows that the experimentally observed efficiencies were well reproduced throughout the energy range by applying a single bias factor irrespective of the distance and the direction of the sources from the detector.

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