Thermoluminescence of Eu3+,Pr3+ codoped calcium sulfate by X-ray irradiation
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概要
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This study investigates the thermoluminescence produced when calcium sulfate codoped with Eu3+ and Pr3+ (CaSO4:Eu3+,Pr3+) is irradiated with X-rays. CaSO4:Eu3+,Pr3+ was synthesized by heating CaSO4·2H2O:Eu3+,Pr3+ at 1050°C. The CaSO4:Eu3+,Pr3+ exhibited red emission upon X-ray irradiation and subsequently emitted an afterglow. The afterglow time was lengthened by adding Li+ ions to the phosphor, and the afterglow time for a Li/Ca atomic ratio of 0.002 was 120 min. Thermoluminescence peaks were observed at 130, 160, 240, 260, and 355°C upon heating CaSO4:Eu3+,Pr3+. The luminances of the thermoluminescence peaks increased with increasing X-ray irradiation time. Only the luminance of the peak near 100°C decreased when CaSO4:Eu3+,Pr3+ was irradiated with X-rays. Therefore, the afterglow is considered to have originated from the thermoluminescence peak near 100°C that had a trap depth of about 0.20 eV.
- 公益社団法人 日本セラミックス協会の論文
著者
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MORI Kentaro
Department of Neurosurgery, Juntendo University Shizuoka Hospital
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Kojima Yoshiyuki
Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
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Nishimiya Nobuyuki
Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
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Mori Kentaro
Department Of Neurosurgery
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Mori Kentaro
Department Of Functional Polymer Science Shinshu University
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Mori Kentaro
Department of Cell Biology, Institute of Development, Aging and Cancer Tohoku University
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MORI Kentaro
Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
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