Response studies on PADC detectors against heavy ion irradiation under vacuum

Hattori, Atsuto*; Kanasaki, Masato; Fukuda, Yuji; Sakaki, Hironao; Yogo, Akifumi; Jinno, Satoshi   ; Hori, Toshihiko; Kurashima, Satoshi; Kamiya, Tomihiro; Kondo, Kiminori; Oda, Keiji*; Yamauchi, Tomoya*

PADC, poly(allyl diglycol carbonate), is well-known as CR-39 track detector and it performs the highest sensitivity for protons and heavy ions in track detectors. In order to diagnose ion beams precisely, we have to check environmental effect of irradiation for their sensitivity. Then, we have focused on the vacuum effect, which means that the storage of PADC in vacuum before and during irradiation decreases the track sensitivity. The vacuum effects had been studied on the case of protons and alpha-particles. In the present study, we have carried out quantitative evaluation of vacuum effect for carbon ion irradiation, and we have found the vacuum effect is also observed in the case of heavy ion irradiation.