Radiation chemical yields for the losses of typical functional groups in PADC films for high energy protons registered as unetchable tracks |
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| Affiliation: | 1. Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658-0022, Japan;2. Center for Supports to Research and Education Activities, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan;3. National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan;4. Institute Pluridisiplinaire Hubert Curien, 23 rue du Loess, Strasbourg Cedex 2 67037, France;1. University Hospital Centre Zagreb, Kišpatićeva 12, 10000 Zagreb, Croatia;2. Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia;1. Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung 804, Taiwan;2. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan;3. Department of Biotechnology, Kaohsiung Medical University, Kaohsiung 807, Taiwan;1. Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan;2. Department of Computational Diagnostic Radiology and Preventive Medicine, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan |
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| Abstract: | A series of FT-IR spectrometric studies has been performed to understand the latent track structure in poly(allyl diglycol carbonate), PADC, which were exposed to proton beams with energies of 20, 30 and 70 MeV. These energies are too high to register etchable tracks in PADC. Chemical damage parameters, such as damage density, effective track core radius and radiation chemical yields, for losses of ether bond, carbonate ester bond and CH groups in PADC are evaluated as a function of the stopping power, which were compared to the previous results for 5.7 MeV proton and heavy ions, between He and Xe. Graphs of the chemical damage parameters are given at the wide stopping powers ranging from 1 to 12,000 keV/μm. The decreasing behaviors of the ether and carbonate ester bonds are on the almost identical trends with those of the heavy ions. On the contrary to this, the reducing behavior of CH groups is similar to that of the gamma rays. Different dependence of the chemical damage parameters for the loss of CH groups is found on the stopping powers between the both sides of the detection threshold as an etched track detector. |
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| Keywords: | PADC Protons Heavy ions G value |
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