RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
地下水中ラドン濃度測定装置の比較―液体シンチレーションカウンタ, IM泉効計, 電離箱, ラドンモニタで得られた結果―
石川 徹夫安岡 由美楢崎 幸範床次 眞司石井 忠須田 博文山田 裕司
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2004 年 53 巻 3 号 p. 133-140

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Measurements of radon in water have been conducted by many investigators so far. While liquid scintillation counting is widely used for radon-in-water measurements in Japan, there are other available devices such as IM-fontactoscopes and atmospheric radon monitors with bubbling kits. In the present study, an intercomparison exercise was conducted for four devices using water samples with two different radon concentrations. The devices used are : a liquid scintillation counter, an IM-fontactoscope, a pulse ionization chamber with a bubbling kit and a radon monitor (which employs a silicon semiconductor detector) with a bubbling kit. As a result, there was a good agreement among the measured values for other devices than the IM-fontactoscope (differences were within±3%), The atmospheric radon monitors (with bubbling kits) could be useful for field surveys of radon-in-water, considering their portability. On the other hand, the values measured with the IM-fontactoscope deviated from other measure-ment values (47% for sample A and 22% for sample B) . The deviation might be caused by a calibration method for the IM-fontactoscope. Since the IM-fontactoscopes are used at some institutes in Japan even nowadays, it is necessary to check values measured with them for determination of radon-in-water concentrations.

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