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Evaluation of the intake of radon through skin from thermal water

ラドンの経皮吸収に関する検討

迫田 晃弘; 石森 有; Tschiersch, J.*

Sakoda, Akihiro; Ishimori, Yuu; Tschiersch, J.*

通常、ラドンによる被ばく評価で最も重要なのは、吸入されたラドン子孫核種の気道沈着に起因する線量である。これに比べて、ラドン自身の吸入による線量は低く、また皮膚吸収の経路が考慮されることもほとんどない。しかし、ラドン温泉のような環境では、温泉中のラドン濃度は空気中のそれに比べて数桁ほど高いという特徴がある。本研究では、経皮吸収を考慮した体内動態モデルを作成し、入浴などによる組織中ラドン濃度の変化等を検討した。また、各種被ばく経路による線量比較も行った。

In general, the deposition of inhaled radon progeny on lung gives the largest dose when the dose evaluation is made for the so-called radon exposure. In this case, the dose from inhalation of radon itself is much lower than that from its progeny. Also, very little studies of the absorption of radon via skin have not been done so far. However, specific environments such as radon hot springs have the characteristics that radon concentration in water is significantly higher by a few orders than that in air. In the present study, a biokinetic model of radon into which its skin-absorption process was incorporated was developed to discuss the change in radon concentrations in tissues during and after bathing in thermal water. This derived dose was compared with other exposure routes from radon and its progeny.

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パーセンタイル:61.5

分野:Biology

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