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重粒子線による水の放射線分解; プライマリ収量から見たトラック構造

Water radiolysis with heavy ions; Correlation between heavy-ion track structure and primary yields

山下 真一; 勝村 庸介; 前山 拓哉*; 村上 健*; Meesungnoen, J.*; Jay-Gerin, J.-P.*

Yamashita, Shinichi; Katsumura, Yosuke; Maeyama, Takuya*; Murakami, Takeshi*; Meesungnoen, J.*; Jay-Gerin, J.-P.*

これまで放射線医学総合研究所(NIRS)の重粒子線がん治療装置(HIMAC)においてがん治療用GeV級重粒子線を用い、広いビーム条件で水の放射線分解における主要生成物のプライマリ収量を測定してきた。測定結果をモンテカルロ法,拡散モデルといったシミュレーションの結果と比べ、トラック構造について検討した。

Primary yields in water radiolysis with relativistic heavy ions from Heavy Ion Medical Accelerator in Chiba (HIMAC) of National Institute of Radiological Sciences (NIRS) have been measured covering wide range of beam conditions. Experimental results were summarized and compared with results obtained not only in a deterministic simulation but also in a stochastic one. Heavy-ion track structure was discussed from microscopic viewpoints based on the experimental and simulation results.

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