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Application of rare earth doped apatite to radioluminography

Research Project

Project/Area Number 06650960
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionNiigata University

Principal Investigator

OHTA Masatoshi  Niigata University, 工学部, 助教授 (60092673)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
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)
KeywordsRadioluminography / radiation sensor / apatite compound / ESR / barium chlorophosphate / strontium chlorophosphate / rare earth / photostimulated luminescence phosphor
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.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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