2010 Fiscal Year Final Research Report
Detection method for U and Th isotopes at ppt order with ultra low-background nuclear β-γ spectroscopy
| Project/Area Number |
20310029
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Risk sciences of radiation/Chemicals
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| Research Institution | Osaka University |
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Principal Investigator |
SHIMA Tatsushi Osaka University, 核物理研究センター, 助教 (10222035)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHISA Keiji 大阪大学, 核物理研究センター, 助教 (30263338)
EJIRI Hiroyasu 大阪大学, 名誉教授 (80013374)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 放射線計測 / ・-・核分光法 / ウラン系列 / トリウム系列 / シンチレーション検出器 |
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| Research Abstract |
A new method for high-sensitivity detection of radioisotopes in U and Th chains was developed. It is based on an ultra low-background beta-gamma spectroscopy, and the detector is made of stacked inorganic scintillator plates with areas as wide as 180mm×180mm. A long-time run was performed in the Oto underground laboratory to investigate the performances of the detector, and the sensitivities of 0.8ppt and 2.2ppt were achieved for the contaminations of U and Th, respectively.
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