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Report No.
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Analysis of spatial distribution of DNA damage around the radiation track

Watanabe, Ritsuko; Shiina, Takuya*; Yokoya, Akinari

We have estimated the initial DNA damage spectrum by track structure simulation method. The result shows that the increase of the complexity of initial DNA damage and cell lethality show partially similar trend in their LET dependence. The goal of our study is to elucidate and modeling the relationship between initial DNA damage and radiation-induced cellular response by using the calculated DNA damage spectrum. For this purpose, the spatial distribution of the damage in larger scale should be considered. In this presentation, in addition to the damage spectrum, the spatial distribution of each type of DNA damage around the radiation track will be shown. The simulated DNA damage spectrum and the spatial distribution such as the distance between two clustered DNA damages in chromosome domain in cell nucleus model was discussed in comparison with the yield of lethal damage estimated from the experimentally obtained survival curves.

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