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Water radiolysis near the bragg peak of therapeutic heavy ions, 3; Comparison between 1D code HIBRAC and 3D code PHITS

Maeyama, Takuya*; Yamashita, Shinichi; Baldacchino, G.*; Taguchi, Mitsumasa; Kudo, Hisaaki*; Sihver, L.*; Murakami, Takeshi*; Katsumura, Yosuke

Yield of hydroxyl radical ($$^{.}$$OH) has been measured near the Bragg peak of therapeutic heavy ions. Such a highly energetic heavy ions go through fragmentation reactions and its contribution has been quantitatively estimated with computer simulation. There are two kinds of simulation codes. One it deterministic 1D code, which needs only a few minutes for single calculation, and the other is stochastic 3D code, which can be extended to wide variety of beam configurations and more close to real situation. However, comparison of them has not been attempted intensively. In this study, measured $$^{.}$$OH yield has been reproduced by considering fragmentations based on these code and results were compared to extract advantages and disadvantages of them.

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