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Observations of radon at the Kamioka Mine and earthquake prediction

Research Project

Project/Area Number 04452026
Research Category

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

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionGifu University

Principal Investigator

TASAKA Shigeki  Gifu University, Faculty of Education, Associate Professor, 教育学部, 助教授 (60155059)

Co-Investigator(Kenkyū-buntansha) SASAKI Yoshimi  Gifu University, Faculty of Education, Professor, 教育学部, 教授 (40021307)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1993: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1992: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsRadon observation / Underwater radon detector / Gass separatin film / PIN photodiode / KAMIOKANDE experiment / Earthquake prediction / Radon emanation rate / Deep underground experiment / 地下実験 / ラドン / ニュートリノ
Research Abstract

We newly developed an underwater radon detector for ^<222>Rn concentration determinations in water. A PIN photodiode, an alpha particle detector, installed inside a container attracts radon families when charged electrostatically. Alpha particles emitted from ^<218>Po(RaA), ^<214>Po(RaC'), ^<210>Po(RaF) and ^<212>Po(ThC') are completely isolated from each other. This system cam be applied to a half year period observation for wide variation of radon concentrations from 0.5(Bq/m^3) in pure water to 10,000(Bq/m^3) in underground water. The observed results of pure water radon concentration in the KAMIOKANDE Tank showed that this technique is valid for the monitor of the degasfication system.
Radon emanation rate were measured from various detector materials in KAMIOKANDE.The expected radon concentration from the exhalation in detector materials was estimated to be about 0.03(Bq/m_3). This value is 1/20 of the observed radon concentration 0.5(Bq/m^3) in KAMIOKANDE.
This system can be applied to three years period observation for wide variation of radon concentrations in the fault underground water. The observed results of underground water radon concentration at a depth of 1,000(m) in the Kamioka Mine showed that this technique is valid for earthquake prediction. Significant decrease in the radon concentration were observed about two and a half days before a magnitude 3.9 earthquake occurred on Atotsugawa fault, and about ten days before a magnitude 4.7 earthquake occurred on the center of Gifu Prefecture.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 田阪茂樹: "水中ラドン検出器の開発" RADIOISOTOPES. 43-3. 125-133 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 佐々木嘉三: "神岡鉱山坑道内の大気中ラドン濃度" 岐阜大学教育学部研究報告(自然科学). 18-2. 1-12 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 田阪茂樹: "岐阜県神岡鉱山における地下水中のラドン濃度の観測(1)" 地震第2輯. 45. 1-9 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 田阪茂樹: "カミオカンデのタンク内の物質からのラドン散逸率の測定" RADIOISOTOPES. (発表予定). 1-9 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 佐々木嘉三: "神岡鉱山における地下水中のラドン濃度と地震活動" 地震. (発表予定). 1-23 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 田阪茂樹: "深い地下におけるラドン族の研究" 東京大学宇宙線研究所神岡実験推進部 平成四年度共同利用研究成果報告書. ICRR報告108-93-4. 9-13 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeki Tasaka: "Development of an Underwater Radon detector" RADIOISOTOPES. Vol.43, No.3. 3-11 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yoshimi Sasaki: "On the Radon Concentration in Air in the Tunnel of Kamioka Mine, Gifu Prefecture" SCIENCE REPORT OF THE FACULTY OF EDUCATION GIFU UNIVERSITY (NATURAL SCIENCE). Vol.18, No.2. 1-12 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeki Tasaka: "Observations of Underground Water Radon Concentration at the Kamioka Mine, Gifu Prefecture (1)" JOURNAL OF THE SEISMOLOGICAL SOCIETY OF JAPAN. Vol.45, No.1 SECOND SERIES. 1-9 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 田阪茂樹: "水中ラドン検出器の開発" ラジオアイソトープ. 43. 125-133 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 佐々木嘉三: "神岡鉱山坑道内の大気中のラドン濃度" 岐阜大学教育学部研究報告(自然科学). 18-2. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 田阪茂樹: "岐阜県神岡鉱山における地下水中のラドン濃度の観測(1)" 地震第2輯. 45. 1-9 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 田阪茂樹: "深い地下におけるラドン族の観測" 東京大学宇宙線研究所神岡実験推進部平成四年度共同利用研究成果報告書. ICRR報告-108-93-4. 9-13 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 田阪茂樹: "深い地下におけるラドン族の観測" 東京大学宇宙線研究所神岡実験推進部平成三年度共同利用研究成果報告書. ICRR報告-103-92-6. 78-95 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 田阪 茂樹,佐々木 嘉三: "岐阜県神岡鉱山における地下水中のラドン濃度の観測(1)" 地震,第2輯. 45. 1-9 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 田阪 茂樹,佐々木 嘉三: "深い地下におけるラドン族の観測" 環境ラドン,電子科学研究所. 53-63 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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