Evidence for a critical dose above which damage to carbonate ester bonds in PADC appear after gamma ray and ultra soft X-ray exposures - Archive ouverte HAL Access content directly
Journal Articles Radiation Physics and Chemistry Year : 2020

Evidence for a critical dose above which damage to carbonate ester bonds in PADC appear after gamma ray and ultra soft X-ray exposures

Tamon Kusumoto
  • Function : Author
Shogo Okada
  • Function : Author
Hisaya Kurashige
  • Function : Author
Kazuo Kobayashi
  • Function : Author
Michel Fromm
Masato Kanasaki
  • Function : Author
Keiji Oda
  • Function : Author
Yoshihide Honda
  • Function : Author
Sachiko Tojo
  • Function : Author
Ryo Ogawara
  • Function : Author
Satoshi Kodaira
Tomoya Yamauchi

Abstract

It has been confirmed that the density of carbonate ester in poly(allyl diglycol carbonate) (PADC), which is a well-known polymeric nuclear track detector CR-39, begins decreasing above a critical dose of about 60 kGy during exposures to Co-60 gamma rays and Ultra Soft X-rays (USX: Kα (Al) with energy 1.49 keV). After exposure to Co-60 gamma rays at 77 K and room temperature (RT), a significant difference in Electron Spin Resonance (ESR) spectra has been observed at both sides of a critical dose of 60 kGy, where is a threshold for the degradation of carbonate ester in PADC. Namely, the types of free radicals in PADC are different from each other below and above this critical dose. Changes in FT-IR spectra of carbonate ester in PADC above critical doses for gamma ray and USX exposures have also been observed, while that of ether decreases linearly with increasing absorbed dose. These results are well concordant with previous results obtained with 28 MeV electron beams. They also indicate that at least two hits of electrons are needed to destroy the carbonate ester in PADC. The layered structure of ion tracks in PADC can be explained thanks to these experimental results. Also, some clues for the identification of created radicals have been obtained from the results using both ESR and IR.

Domains

Radiochemistry
Fichier principal
Vignette du fichier
RPD paper 2019 manuscipt accepted.pdf (2.88 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03549049 , version 1 (29-05-2024)

Identifiers

Cite

Jean-Emmanuel Groetz, Tamon Kusumoto, Shogo Okada, Hisaya Kurashige, Kazuo Kobayashi, et al.. Evidence for a critical dose above which damage to carbonate ester bonds in PADC appear after gamma ray and ultra soft X-ray exposures. Radiation Physics and Chemistry, 2020, 170, ⟨10.1016/j.radphyschem.2019.108628⟩. ⟨hal-03549049⟩
20 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More