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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

C.L. Rääf, R. Finck, J. Martinsson, M. Isaksson

Updated: Dec 11, 2020

Radiological Benefit of Decontamination of Urban Settlements After a Radioactive Fallout: A Model Study

C.L. Rääf, R. Finck, J. Martinsson, M. Isaksson (Lund University, Sweden; Gothenburg University, Sweden)


Given that experience from Japan after the Fukushima fallout shows that decontamination measures of residential areas may take up to several years to achieve, we have estimated the added averted detriment for newborn children by decontamination measures for areas that have been evacuated as a function of return time. Estimations predict that the cumulative life-time attributable risk averted by decontamination decreases with a half-time of 2-3 y for a Fukushima type release. If the return time of the residents is more than 5 y after the fallout, decontamination contributes with 10-35% of the averted cumulative risk compared with performing only evacuation, assuming optimistic values for decontamination efficiency (90% dose reduction). The estimates are highly dependent on the effective ecological half-time of cesium (ranging from 3 to 20 y). If considered for the radiological benefits alone, our conclusion is that future decontamination programs be kept within a timeframe of 5 y.

放射性物質降下後の都市部居住地における除染の放射線上の利点:モデル調査

C.L. Rääf, R. Finck, J. Martinsson, M. Isaksson (Lund University, Sweden; Gothenburg University, Sweden)


日本の福島での放射性物質降下後の経験によると居住地の除染対策が実現するのに最長数年を要する場合があることを考慮し、我々は避難対象区域の除染対策により回避された新生児の新たな被ばくを帰還時期に応じて推定した。推定では、福島型の放出だと2~3年の半減期により、除染で回避される累積的な寿命寄与リスクが低下すると予測されている。住民の帰還時期が放射性物質降下から5年を超える場合、除染効率の楽観的な値(90%の線量低減)を仮定すれば、避難のみを実施した場合と比べ回避された累積リスクが10~35%となり除染が貢献している。この推定はセシウムの実効生態半減期(3~20年)に極めて依拠している。放射線上の利点のみを考えると、将来的な除染プログラムを5年の時間枠内で維持すべきであるというのが我々の結論である。


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