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説明
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.
収録刊行物
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- Journal of Physics: Conference Series
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Journal of Physics: Conference Series 718 042022-, 2016-06-09
IOP Publishing
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詳細情報 詳細情報について
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- CRID
- 1050564287715432704
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- NII論文ID
- 120006535041
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- NII書誌ID
- AA12839617
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- ISSN
- 17426596
- 17426588
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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