| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2008: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
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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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