Current development status of simulation code for physical and chemical processes in PHITS

Matsuya, Yusuke  ; Kai, Takeshi   ; Yoshii, Yuji*; Kusumoto, Tamon*; Akamatsu, Ken*; Hirata, Yuho   ; Sato, Tatsuhiko   

To clarify the mechanisms on radiation-induced biological effects such as cell death and mutations, it is of importance to evaluate the initial processes such as atomic interactions (physical processes) and radical reactions (chemical processes). Recently, in the recent development of a general-purpose Monte Carlo code for radiation transport, PHITS, a detailed simulation codes that estimate these processes have been implemented. In this presentation, we will introduce the features and the current development status of the track-structure modes (i.e., PHITS-ETS and PHITS-KURBUC modes), that allows the calculation of the physical processes of radiation in the human body, and a chemical code (i.e., PHITS-Chem code) that enables simulating radicals dynamics after irradiation. This presentation would contribute not only to accurate understanding of radiation effects in life sciences and medical fields but also to further applications in nuclear engineering.