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詳細人体モデルを用いた原爆線量再評価プロジェクトの現状

Current status of the project for re-evaluation of atomic-bomb survivor doses using a new computational voxel phantom series

佐藤 達彦; 船本 幸代*; Paulbeck, C.*; Griffin, K.*; Lee, C.*; Cullings, H.*; Egbert, S.*; 遠藤 章; Hertel, N.*; Bolch, W.*

Sato, Tatsuhiko; Funamoto, Sachiyo*; Paulbeck, C.*; Griffin, K.*; Lee, C.*; Cullings, H.*; Egbert, S.*; Endo, Akira; Hertel, N.*; Bolch, W.*

本研究では、放影研を中心とする国際共同研究プロジェクトのもと、体型を自由に変更可能なポリゴンファントムをベースに、1945年の日本人標準体型を持つ成人男女、5年齢群の小児男女、及び4妊娠期間の妊婦・胎児に対するボクセルファントムを構築し、いくつかの典型的な被爆状況に対してその臓器線量を再評価した。その際、粒子輸送計算には最新版のPHITSやMCNPを用いた。その結果、DS02と本研究による計算結果は概ね10%の範囲内で一致するが、骨組織や結腸など、臓器の定義や計算手法が大きく変更になった臓器線量に対しては最大で数10%程度の差があることが分かった。本発表では、それらの結果を報告すると共に、今後、これら最新モデルを原爆線量評価システムに組み込むためのデータベース構築手法について紹介する。

Owing to recent advances in computational dosimetry tools, it is desirable to update the dosimetry system for the atomic-bomb survivors, DS02. The DS02 system is based on adjoint Monte Carlo particle transport simulations coupled with stylized computational human phantoms. We therefore developed the J45 series of computational voxel phantoms representative of 1945 Japanese adults, children, and pregnant females, as a part of international collaboration project between RERF and several institutes in Japan and USA. Using those phantoms, we calculated organ doses in adults for 12 representative exposure scenarios having realistic particle energy and angular fluence, using the latest Monte Carlo particle transport codes, PHITS and MCNP. Those data were compared with survivor organ doses given by the DS02 system. It was found that overall impacts of introducing the new computational method in the dosimetry system are not so significant, less than 10% in most cases, except for organs whose calculation method or definition was changed such as colon and bone marrow. The current status of this international collaboration project will be presented at the meeting.

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