@article{oai:repo.qst.go.jp:00078484,
 author = {Kusumoto, Tamon and Okada, Shogo and Kurashige, Hisaya and Kobayashi, Kazuo and Fromm, Michel and Quentin, Raffy and Ludwig, Nicolas and Kanasaki, Masato and Oda, Keiji and Honda, Yoshihide and Tojo, Sachiko and Jean-Emmanuel, Groetz and Ogawara, Ryo and Kodaira, Satoshi and Rémi, Barillon and Yamauchi, Tomoya and Tamon, Kusumoto and Ryo, Ogawara and Satoshi, Kodaira},
 journal = {Radiation Physics and Chemistry},
 month = {May},
 note = {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 duringexposurestoCo-60gammaraysandUltraSoftX-rays(USX:Kα(Al)withenergy1.49keV).Afterexposure 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.},
 title = {Evidence for a critical dose above which damage to carbonate ester bonds in PADC appear after gamma ray and ultra soft X-ray exposures},
 volume = {170},
 year = {2020}
}