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※ 半角英数字
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Study on advancement of ${it in vivo}$ counting using mathematical simulation, in Japanese

計算シミュレーション手法に基づく体外計測法の高度化に関する研究

木名瀬 栄

Kinase, Sakae

計算シミュレーションによる体外計測装置の数学的校正手法を開発した。この手法による計数効率や応答関数については、日本原子力研究所の全身カウンタを対象としてシミュレーションを行い、実測結果とよく一致した計算結果が得られることが確認できた。また、実測及び計算シミュレーションにより、体外計測装置による体内放射能評価の不確かさについて解析し、体内放射能評価の不確かさにおいて体内放射能分布による体外計測装置計数効率の変動、計測装置による測定の統計誤差が大きく影響することがわかった。

A calibration technique for in vivo counting application using Monte Carlo simulation was developed. To validate the calibration technique by calculations, the response functions and counting efficiencies of a whole-body counter installed in JAERI were evaluated using the simulation and measurements. Consequently, the calculations are in good agreement with the measurements. The uncertainties in body burdens of 137Cs estimated with the whole-body counter were also investigated using the Monte Carlo simulation and measurements. It was found that the uncertainties of body burdens estimated with the whole-body counter are strongly dependent on various sources of uncertainty such as radioactivity distribution within the body and counting statistics.

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