Development and application of PHITS track structure calculations to elucidate the response mechanisms of radiation detectors

Hirata, Yuho   ; Kai, Takeshi   ; Ogawa, Tatsuhiko   ; Matsuya, Yusuke  ; Sato, Tatsuhiko   

Accurate dose evaluation by radiation detectors is crucial for the safe use of radiation. However, with certain types of radiation, the output from detectors can be nonlinear relative to the dose, thereby hindering correct dose assessments. To address these issues, it is vital to theoretically analyze the mechanisms affecting detector outputs. The radiation transport code PHITS includes a track structure analysis mode that precisely tracks radiation behavior. This review paper introduces the newly developed Electron Trajectory Structure Analysis Mode for Arbitrary Materials (ETSART), which facilitates the tracking of electron beams in various detector materials. Additionally, we present an example of phosphor quenching under ion beam irradiation, as analyzed using the PHITS track structure mode.