Exclusive attributes of undoped poly (ethylene terephthalate) for alpha particle detection |
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| Institution: | 1. Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan;2. National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba-shi, Chiba, 263-8555, Japan;3. Waseda University, 513, Waseda-Tsurumaki-cho, Shinjuku-ku, Tokyo, 162-0041, Japan;1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, China;2. Department of Mechanical Engineering and Science, Kyoto University, Kyoto-daigaku-katsura, Nishikyo-ku Kyoto 615-8246, Japan;1. Department of Materials Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi 316-8511, Japan;2. Research Reactor Institute, Kyoto University, 2-1010 Asashiro-nishi, Kumatori, Sennan, Osaka 590-0494, Japan;3. Japan Metals & Chemicals Co., Ltd., Nishiokitama-gun, Yamagata 999-1351, Japan |
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| Abstract: | Poly (ethylene terephthalate) (PET) is available worldwide and has a broad range of applications. However, its basic properties as a scintillation material that is undoped with fluorescent guest molecules are not completely known. Here, we optically characterise undoped PET for use in radiation detection. Light absorption is primarily below 350 nm, with an emission maximum at 385 nm. An effective refractive index, determined from the emission spectrum and the wavelength dependence of the refractive index, is 1.62, which is greater than that for the sodium D line (ND = 1.57). The density of PET is 1.33 g/cm3, and its stopping power for 1-MeV electrons is 1.72 MeV cm2/g. Distinct peaks generated by alpha particles from 210Pb and 241Am radioactive sources appear in PET light-yield distributions. The PET response to 5-6-MeV alpha particles is approximately one-eighth that for electrons. These results demonstrate that undoped PET has special attributes for alpha particle detection. This knowledge will enable better performance of radiation equipment based on PET and its blends with other aromatic ring polymers. |
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| Keywords: | Poly (ethylene terephthalate) Aromatic ring polymer Undoped scintillation material Basic property Alpha particle detection |
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