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Potential inhalation dose due to remediation activities in the Fukushima exclusion zone

避難区域における除染活動に伴う吸入被ばくの評価

Tschiersch, J.*; 吉村 和也  ; Spielmann, V.*; Hurkamp, K.*; 飯島 和毅  ; 篠永 妙子*; 宮原 要  

Tschiersch, J.*; Yoshimura, Kazuya; Spielmann, V.*; Hurkamp, K.*; Iijima, Kazuki; Shinonaga, Taeko*; Miyahara, Kaname

吸入被ばく線量は核種の種類や量のみならず、放射性浮遊じんの粒径分布や肺液への溶解性にも依存する。本研究では、除染中の浮遊じんを採取し、これらパラメータ(放射能中央粒径とその幾何平均値、擬似肺液への溶解性)を得た。得られたパラメータとIMBAコードを使用し、ICRP肺モデルによる吸入被ばく線量の計算を行った。本調査で得たパラメータ値とICRPのデフォルト値で計算された吸入被ばく線量を比較し、その不確実性を評価した。

Inhalation dose depends on the kind and amount of inhaled radionuclides, but also on the size of radioactive particles and the solubility of the radionuclides in the lungs. Initial measurements during decontamination provide experimental data of the main parameters. These are particle size distribution with activity median aerodynamic diameter (AMAD) and geometric standard deviation and the solubility in the lungs. The dose assessment is performed according ICRP lung model using the computer code IMBA professional. Doses determined from measured parameters are compared to those using ICRP default values. Variability is studied and the range of potential inhalation dose is assessed.

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