RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
低バックグラウンド液体シンチレーション計測に現れるラドンの影響の低減化
青木 達
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ジャーナル フリー

1991 年 40 巻 12 号 p. 508-511

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α-Rays from atmospheric radionuclides, i.e. radon and its daughters (222Rn, 218Po and 214Po) fluctuate background counts of liquid scintillation counters, since they are sensitive to the luminescence of nitrogen molecules excited by the α-rays. The background count was decreased and its fluctuation was suppressed by passing nitrogen gas through its detector chamber; for example the count rate of tritium free water sample, which fluctuates in the range of 3-5 min-1 without the gas flow, was decreased to 3.2±0.3 min-1.

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