This study was the first to determine the effectiveness of radon concentration measurement in water using the degassing method as a screening method based on the liquid scintillation counter method. The degassing method used two radon monitors (AlphaGUARD and RAD7) and two monitor-attached degassing devices (AquaKIT and RAD H2O). These were effective screening methods based on the WHO guideline value of 100 Bq L−1. The screening values confirmed that a combination of the AlphaGUARD and AquaKIT was preferred. The results are useful for radon measurement for exposure control in drinking water and environmental in-situ field measurement.

山本昭夫 1,4) ・髙田文子 2,5) ・松本真歩 3) 1) 農業・食品産業技術総合研究機構遺伝資源センター，茨城県つくば市，〒 305-8602 2) 農林水産省大臣官房環境政策室，東京都千代田区，〒 100-8950 3) 環境省自然環境局，東京都千代田区，〒 100-8975 4) 現：農業・食品産業技術総合研究機構企画調整部，茨城県つくば市，〒 305-8517 5) 現：農林水産省食品産業局，東京都千代田区，〒 100-8950