ID | 112413 |
著者 |
江尻, 宏泰
Osaka University
Hazama, R
Osaka Sangyo University
Ikeda, H
Tohoku University
Imagawa, K
I.S.C. Lab.
Inoue, K
Tohoku University
Kanzaki, G
Tokushima University
Kozlov, A
The University of Tokyo
Shima, T
Osaka University
Takemoto, Y
The University of Tokyo
Teraoka, Y
Tohoku University
Umehara, S
Osaka University
Yasuda, K
I.S.C. Lab.
Yoshida, S
Osaka University
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資料タイプ |
学術雑誌論文
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抄録 | The PICO-LON project aims at search for cold dark matter by means of highly radio-pure and large volume NaI(Tl) scintillator. The NaI powder was purified by chemical processing to remove lead isotopes and selecting a high purity graphite crucible. The concentrations of radioactive impurities of 226Ra and 228Th were effectively reduced to 58±4 μBq/kg and 1.5±1.9 μBq/kg, respectively. It should be remarked that the concentration of 210Pb, which is crucial for the sensitivity to dark matter, was reduced to 24±2 μBq/kg. The total background rate at 10 keVee was as low as 8 keV-1kg-1day-1, which was sufficiently low to search for dark matter. Further purification of NaI(Tl) ingot and future prospect of PICO-LON project is discussed.
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掲載誌名 |
Journal of Physics: Conference Series
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ISSN | 17426596
17426588
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cat書誌ID | AA12839617
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出版者 | IOP Publishing
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巻 | 718
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開始ページ | 042022
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発行日 | 2016-06-09
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権利情報 | Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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言語 |
eng
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著者版フラグ |
出版社版
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部局 |
理工学系
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