[16p-2W-1~10] 2.2 Detection systems

△ [16p-2W-5] A role of low energy electrons on nuclear tracks in PADC.

〇(D)Tamon Kusumoto¹, Yutaka Mori², Masato Kanasaki¹, Keiji Oda¹, Satoshi Kodaira³, Hisashi Kitamura³, Yoshihide Honda⁴, Sachiko Tojo⁴, Tomoya Yamauchi¹ (1.Kobe Univ., 2.CSREA, 3.NIRS, 4.ISIR)

Keywords:PADC,CR-39,Heavy ions

A series of FT-IR study has been performed to under stand modified structure of latent tracks in poly(allyl diglycol carbonate) (PADC) films. According to past study, the radiation chemical yield, G value, for loss of ether bond decreased from 20 for 5.7 MeV protons for down to 5 for C ions. In addition, G value for loss of ether bonds for gamma ray from Co-60 is a large value of 20. This results indicated the network of PADC is easily broken by low energy electrons slowed down in track hallo region. In present study, to understand role of low energy electrons clearly, We conducted series of FT-IR studies on PADC films exposed to up to 70 MeV protons and 28 MeV electrons in air at National Institute of Radiological Sciences (NIRS) and each Institute for Scientific and Industrial Research (ISIR) and will evaluate effective track core radius and radiation chemical yield, G value,. For example, in the case of 30 MeV protons, the effective track core radius for loss of ether bonds exists on the extrapolation line of the past study. In addition, the G value for loss of ether bonds for 30 MeV protons is 24 and 28 MeV electrons is 6.9. From this results, the G value for loss of ether bonds for 30 MeV protons is larger than that for 5.7 MeV protons and gamma ray from Co-60. In addition, the G value for loss of ether bonds for 28 MeV electrons is much smaller than that for 5.7 MeV protons and gamma ray from Co-60. These results indicate the network of PADC is easily broken by low energy electrons and support the conventional view points.