1993 Fiscal Year Final Research Report Summary
UV light measurements of the sunlight using thermoluminescence of KCl : Eu^<2->
| Project/Area Number |
04650012
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied materials
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| Research Institution | Kanazawa University |
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Principal Investigator |
TAKEUCHI Nozomu Kanazawa University・Faculty of Technology, Professor, 工学部, 教授 (20035588)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Syoichi Kanazawa University・Faculty of Technology, Assistant, 工学部, 助手 (70175503)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Europium / Alkalihalide Single Crystal / Sunlight / UV Dosimetry / Thermoluminescence |
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| Research Abstract |
UV light irradiation followed by heating a single crystal of KCl doped with divalent europium ions was shown to produce thermoluminescence (TL) glow peaks which may provide a unique method for UV dosimetry of the sunlight. In this work several experimental conditions were investigated to measure the UV light and the results are summarized as follows.
(1) The UV light in the range from 200 to 320nm was shown to be effective for measurements of the TL glow peaks. The most effective UV light was found at the wavelength around 250nm corresponding to Eu^<2+> [^8S_<7/2>(4f^7) to t_<2g>(4f^65d)] transition.
(2) The TL intensity which was estimated with identical UV light irradiation increased with temperature of the pre-heat treatment of the crystal. The increment as high as 10 times was obtained for the crystal treated at 927K in argon gas atmosphere for 30min compared with untreated one.
(3) The TL intensity was also found to depend on the europium concentration in the crystal and the optimum concentration was around 100ppm.
(4) Preliminary measurement of the glow peak after irradiation of the sunlight was successful wth the crystal doped with 100ppm of europium, though the intensity was so weak. The sunlight irradiation was directly carried out onto the crystal placed on the roof of the building of our laboratory in Kanazawa.
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