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Very Low Background Radiation Measurements with GSO Scintillator

Research Project

Project/Area Number 09680483
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般・原子力学
Research InstitutionThe University of Tokushima

Principal Investigator

KOORI Norihiko  Univ of Tokushima, Fac.Integrated Arts & Sci.Prof., 総合科学部, 教授 (20038053)

Co-Investigator(Kenkyū-buntansha) FUSHIMI Ken-ichi  Univ of Tokushima, Fac.Integrated Arts & Sci.Lect., 総合科学部, 講師 (90274191)
NAKAYAMA Shintaro  Univ of Tokushima, Fac.Integrated Arts & Sci.Prof., 総合科学部, 教授 (70116846)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥3,300,000 (Direct Cost: ¥3,300,000)
Keywordsscintillator / low background / GSO / scintillation mechanism / environmental neutron / Pulse shape analysis / 2重β崩壊
Research Abstract

In this research, very low backgrounds are intended to be realized for measurements of environmental gamma-rays and neutrons with GSO (Gd_2SiO_5 : Ce) scintillators. It may be possible if events from contaminated radioactive elements in GSO scintillators are discriminated. Followings are the results from the present research.
(1) Low background measurement with a GSO scintillator : The very long half-life of Gd-152 and knowledge on the Onubetabeta decay from Gd-160 were obtained under very low background conditions. From the measurements contamination of these elements and U- and Th-series elements were estimated.
(2) Neutron detection with a GSO scintillator : The GSO scintillator response were observed for thermal neutrons. Gamma-rays of 79.5 keV from Gd-158 resulted by the thermal neutron capture were confirmed with a low intensity neutron source, and then a high detection efficiency of 14% was obtained for a 0.9" phi * 1" GSO crystal. Applications will be planed to measurement of very low flux of environmental neutrons will be possible.
(3) Pulse shape of scintillation from a GSO scintillator : In order to discriminate alpha-rays from the contaminated elements in GSO scintillators for very low background condition, scintillation pulse shapes were measured with a high speed digital oscilloscope. A pulse shape analyzing system were developed for this purpose, and measured the decay times of scintillation from GSO crystals of different Ce concentrations. No large difference in the decay times of scintillations for alpha-rays and gamma-rays. Further measurements for dependence to applied temperature will be needed.
The present research provides the knowledge about very low background condition with GSO scintillators.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] T.Iwawaki他: "“Study of Nuclear Rare-Decays by GSO Scintillator"" Proc.of 11th Workshop on Radiation Detectors and Their Uses. 98-4. 66-73 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Nakayama他: "“GSO(Ce)Detector System for the(^7Li,^7 Be-gamma)Experiment at RCNP"" Proc. of 11th Workshop on Radiation Detectors and Their Uses. 98-4. 275-279 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Murohka他: "“Response Function of a Stacked GSO(Ce)Spectrometer to Cosmic-rays"" IEEE Tran.Nucl.Sci.NS44-3. 484-488 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Iwawaki他: "“Nuclear Rare Decays Studied with GSO Scintillator"" 徳島大学総合科学部紀要Natural Science Research. 11. 1-6 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Nakayama他: "“GSO-Detector System “NYMPHS" for(^7Li,^7 Be-gamma)Reaction at Intermediate Energies"" Nucl.Instr.and Meth.A404-1. 34-40 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Yoshida他: "“Absolute Efficiency of a Stacked GSO(Ce)Spectrometer for Intermediate Energy Protons"" Nucl.Instr.and Meth.A411-1. 46-50 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Iwawaki, K.Fushimi. T.Horikawa, N.Koori, and S.Nakayama: ""Study of Nuclear Rare-Decays by GSO Scintillator"" Proc. of llth Workshop on Radiation Detectors and Their Uses. 66-73 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Nakayama, K.Fushimi, H.Kori, H.Akimune, I.Daito, T.Fujimura, Y.Fujita, M.Fijiwara, T.Inomata, T.Iwawaki, N.Koori, K.Takahisa, A.Tamii, M.Tanaka, H.Toyokawa, and T.Yamagata: ""GSO (Ce) Detector System for the (^7Li, ^7Be-gamma) Experiment at RCNP"" Proc. of llth Workshop on Radiation Detectors and Their Uses. 257-279 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Murohka, K.Anali, G.Wakabayashi, H.Yoshida, A.Nohtomi, Y.Uozumi, T.Sakae, M.Matoba, T.Maki, and N.Koori: ""Response Function of a Stacked GSO (Ce) Spectrometer to Cosmic-rays"" IEEE Tran.Nucl.Sci. NS-44, no.3. 484-488 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Iwawaki, K.Fushimi, T.Horikawa, N.Koori, and S.Nakayama: ""Nuclear Rare Decays Studied with GSO Scintillator"" Natural Science Research. 11. 1-6 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Nakayama, K.Fushimi, H.Kohri, H.Akimune, I.Daito, H.Fujimura, Y.Fujita, M.Fujiwara, T.Inomata, K.Ishibashi, T.Iwawaki, N.Koori, K.Takahisa, A.Tamii, M.Tanaka, H.Toyokawa, and T.Yamagata: ""GSO-Detector System "NYMPHS" for (^7Li, ^7Be-gamma) Reaction at Intermediate Energies"" Nucl.Instr.and Meth. A404 no.1. 34-40 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Yoshida, D.Konishi, K.Anami, H.Murohka, Y.Uozumi, S.Aoki, T.Yamamoto, G.Wakabayashi, A.Nohtomi, T.Sakae, M.Matoba, T.Maki, and N.Koori: ""Absolute Efficiency of a Stacked GSO (Ce) Spectrometer for Intermediate Energy Protons"" Nucl.Instr.and Meth. A411, no.1. 46-50 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Iwawaki他: "“Nuclear Rare Decays Studied withGSO Scintillator"" 徳島大学総合科学部紀要Natural Science Research. 11. 1-6 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Nakayama他: "“GSO-Detector System“NYMPHS"for (Li,Be-gamma)Reaction at Intermediate Energies"" Nucl.Instr.and Meth.A404-1. 34-40 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Yoshida他: "“Absolute Efficiency of a Stacked GSO(Ce)Spectrometer for Intermediate Energy Protons"" Nucl.Instr.and Meth.A411-1. 46-50 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Iwawaki, K.Fushimi, T.Horikawa, N.Koori, S.Nakayama: "Nuclear Rare Decays Studied with GSO Scintillator" 徳島大学総合科学部紀要・自然科学研究. 11巻. 1-6 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2021-10-15  

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