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Impact of the new nuclear decay data of ICRP Publication 107 on inhalation dose coefficients for workers

新しい放射性核種データICRP Publication 107が線量係数に与える影響

真辺 健太郎; 遠藤 章; Eckerman, K. F.*

Manabe, Kentaro; Endo, Akira; Eckerman, K. F.*

新たに出版された放射性核種データICRP Publication 107(ICRP107)と、従来のデータICRP Publication 38(ICRP38)を用いて、放射性核種データの更新が線量係数に与える影響を調べた。DCALコードを用いて、90元素, 774核種, 1572ケースについて、職業人が放射性核種を吸入摂取した際の預託実効線量係数を計算した。ICRP107に基づく線量係数がICRP38に基づく線量係数に対して10%以上増加したのは98ケース、10%以上減少したのは54ケースであった。線量係数の違いは、壊変あたりに放出される全エネルギーの変更が主な原因であることが明らかになった。また、半減期、放射線の種類及び崩壊様式の変更も、線量係数の違いをもたらした。

The impact a revision of nuclear decay data had on dose coefficients was studied using data newly published in ICRP Publication 107 (ICRP107) and existing data from ICRP Publication 38 (ICRP38). Committed effective dose coefficients for occupational inhalation of radionuclides were calculated using two sets of decay data with the Dose and Risk Calculation software DCAL for 90 elements, 774 nuclides, 1572 cases. The dose coefficients based on ICRP107 increased by over 10% to those based on ICRP38 in 98 cases, and decreased by over 10% in 54 cases. It was found that the differences in dose coefficients mainly originated from the radiation energy emitted per nuclear transformation having revised. In addition, revisions of the half-lives, radiation types and decay modes also resulted in changes in the dose coefficients.

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パーセンタイル:100

分野:Environmental Sciences

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