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Development of a high sensitivity detector for Radium in water and a study of Rajium removal.

Research Project

Project/Area Number 07554003
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 素粒子・核・宇宙線
Research InstitutionUniversity of Tokyo

Principal Investigator

KAJITA Takaaki  Univ.of Tokyo, ICRR,Associate Professor, 宇宙線研究所, 助教授 (40185773)

Co-Investigator(Kenkyū-buntansha) NISHIMURA Syuuichi  Organo Co., Senior Engineer, 主任技師(研究職)
TAKEUCHI Yasuo  Univ.of Tokyo, ICRR,Research Associate, 宇宙線研究所, 助手 (60272522)
MIYANO Kazumasa  Niigata Univ., Faculty of Science, Professor, 理学部, 教授 (10011529)
TASAKA Shigeki  Gifu Univ., Faculty of Education, Assosiate Professor, 教育学部, 助教授 (60155059)
渡辺 靖志  東京工業大学, 理学部, 教授 (40126199)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1996: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1995: ¥7,200,000 (Direct Cost: ¥7,200,000)
KeywordsRadium / pure water / Radon / 太陽ニュートリノ
Research Abstract

A high sensitivity detector for Radium in water was developed. This detector measures Radons which are the decay product of Rajium. Radons are extracted from the water into the air by the bubbling method. The volume of the sample water is 700 liters. And a 70-liter Radon detector for air is used to detect Radons. The sensitivity of the detector to the Radium concentration in water is about 1mBq/m^3.
We measured the Radium concentration of the pure water in the 50,000 ton Super-Kamiokande detector. The measured value was 0.9 (]SY.+-。[) 0.1 (stat.) (]SY.+-。[) 0.1 (syst.) mBq/m<@D13@>D1, or equivalently, 68.4 (]SY.+-。[) 6.4 (]SY.+-。[) 7.7Ra/cm<@D13@>D1. This level of Radium concentaration was the goal when we started this research.
We also studied what elements used in the water purification sustem are capable of removing Radium efficiently. This measurement was carried out using the kamiokande water which contained more than 100 times more Radium. We observed that Radium can be removed efficintly by Reverse-Osmosis membrane, Ultra-filter and activated charcoal.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] M.Nemoto et al.: "Development and calibration of a high sensitive radon detector in air" Contribution paper to “Radon and Thoron In the Human Envioronment". (作成中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 根本 真知子 他: "静電補集型超高感度空気中ラドン検出器の開発" PADIOISOTOPES. 46・10. 710-719 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Nemoto et al.: "Development and calibration of a high sensitive radon detector in air" Constribution paper to "Radon and Thoron in the Human Envioronment" Fukuoka, Japan. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Nemoto et al.: " "Development of a high sensitive Radon detector with electrostatic collection" (in Japanese)" RADIOISOTOPES. Vol.46. 710-719 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Nemoto et al.: "Development and calibration of a high sensitive radon detector in air." Contribution paper to "Radon and thoron In the Human Envioronment". (作製中). (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 根本真知子他: "静電捕集型超高感度空気中ラドン検出器の開発" RADIOISOTOPES. 46・10. 710-719 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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