| Project/Area Number |
06650960
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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 |
無機工業化学
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| Research Institution | Niigata University |
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Principal Investigator |
OHTA Masatoshi Niigata University, 工学部, 助教授 (60092673)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Radioluminography / radiation sensor / apatite compound / ESR / barium chlorophosphate / strontium chlorophosphate / rare earth / photostimulated luminescence phosphor |
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| Research Abstract |
Strontium chlorophosphate crystal and barium chlorophosphate crystal which are analogous apatite compounds, were attempted to apply to a luminescence phosphor for radioluminography, in order to develop an energy sensor of radiation. Strontium chlorophosphate crystal and barium chlorophosphate crystal doped with europium ion or gadolinium ion exhibited a bright photostimulated luminescence (PSL) after X-ray irradiation. The PSL intensity was higher in Eu- or Gd-doped strontium chlorophosphate than in Eu- or Gd-doped barium chlorophosphate.
Eu- or Gd-doped barium chlorophosphate exhibited dark PSL after ultraviolet irradiation. However, Eu- or Gd-doped strontium chlorophosphate exhibited PSL after ultraviolet irradiation or visible ray irradiation. Furthermore, thermoluminescence and ESR signal due to electron captured with electron trap was observed in Eu- or Gd-doped strontium chlorophosphate after ultraviolet or visible ray irradiation in analogy with Eu- or Gd-doped strontium chlorophosphate after X-ray irradiation. These results suggest that electron trap center is formed in Eu- or Gd-doped strontium chlorophosphate irradiated with lower energy ray than band gap energy of strontium chlorophosphate (host crystal), that is, Eu- or Gd-doped strontium chlorophosphate is available for an energy sensor of radiation.
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