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Dose estimates from radon absorbed via skin and its progeny deposited on skin in radon therapy; Comparison with different exposure pathways

ラドンの皮膚吸収および子孫核種の皮膚沈着による被ばく線量の評価; 他の被ばく経路との比較

迫田 晃弘  ; 石森 有 ; Tschiersch, J.*

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

これまで、ラドン療法施設におけるヒトによる実験研究が幾つか報告され、ラドンの皮膚吸収および子孫核種の皮膚沈着が検討されてきた。本研究では、このようなデータを用いて、皮膚に関わるラドン被ばくに起因する線量を計算した。まず、ラドンまたは子孫核種の体内挙動に係る数理モデルを作成した。次いで、必要なパラメータ(例えば、ラドンの皮膚-環境間の移行係数、ラドン子孫核種の皮膚沈着係数)の数値の最適化を行った。これより、ラドン療法の最中と事後の体内での放射能を推定し、線量係数を評価した。本発表では、これまでに報告のあった他の被ばく経路(例えば、子孫各種の気道沈着)との比較検討も行う。本研究結果は、様々な観点からラドン被ばくを理解するのに有用と考えられる。

Some human studies have been made in radon-therapy facilities to measure the intake of radon via skin and the deposition of radon progeny onto skin. In the present study, with based on such empirical data, we addressed dose calculations for various organs and tissues due to these exposures. We have first developed mathematical models expressing the behavior of radon or its progeny in the body, and then optimized the values of parameters required. To compute dose coefficients, the activity of radon or its progeny in skin (and other organs and tissues) during and after the treatment was predicted with the optimized parameters. In the presentation, the results will be presented in detail and compared with other different pathways as inhalation that have ever been reported. The present work would contribute to one's understanding of radon exposure and its resulting doses from various viewpoints.

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