Applications of the microdosimetric function implemented in the macroscopic particle transport simulation code PHITS

Sato, Tatsuhiko   ; Watanabe, Ritsuko; Sihver, L.*; Niita, Koji*

The microdosimetric function of PHITS has been applied to the biological dose estimation for charged-particle therapy and the risk estimation for astronauts. The former application was performed in combination with the microdosimetric kinetic model, while the latter was done with the radiation quality factor expressed as a function of lineal energy. Owing to the unique features of the microdosimetric function, the improved PHITS has a potential to establish more sophisticated systems for the radiological protection in space as well as the treatment planning of charged-particle therapy.