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高時間分解能の連続測定に着目した屋内ラドン研究のレビュー

Review of indoor radon studies with a focus on continuous time-resolved measurement

迫田 晃弘   ; Hasan, M. M.*; 神崎 訓枝   ; 飯本 武志*

Sakoda, Akihiro; Hasan, M. M.*; Kanzaki, Norie; Iimoto, Takeshi*

ラドンは自然界に存在する放射性ガスであり、肺がんの原因となりうる。屋内ラドン濃度について、過去数十年の間に日本を含む多くの国や地域で調査が行われ、国際的な報告書にまとめられている。国民の線量評価に向けた年間ラドン濃度は、長期的な積算測定に基づいて決定される。一方、屋内ラドン濃度の空間的・時間的変動や上昇のメカニズムを解明したり、短期・中期の測定値からの年平均値の予測可能性を検討するために、ラドンや関連する環境因子を高時間分解能で連続測定する取り組みも行われている。本研究では、これら測定結果に係る知見を収集・更新し、今後の課題を検討した。

Radon is a naturally occurring radioactive gas that can cause lung cancer. Many nationwide and regional surveys, including Japan, on radon concentration in the indoor air of dwellings were implemented in the past couple of decades and compiled by international reports; the annual radon concentration in each nation or region was determined by long-term integrating measurement for dose assessment of the public. On the other hand, efforts of continuous time-resolved monitoring of radon, in addition to relevant environmental factors, have also been made for research purposes to elucidate physical mechanisms of spatial and time variations and elevation of indoor radon concentration as well as to investigate the possibility of predicting annual averages from short- or mid-term measurements. The aims of the present work are to update findings from such measurements and explore what should be future work.

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