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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

R.A. Mikailova, Y. Onda, S.V. Fesenko, H. Kato

Updated: Dec 11, 2020

Absorbed Dose Rate Assessment for Japanese Cedar Trees Exposed to Ionising Radiation After the Fukushima Accident

R.A. Mikailova (University of Tsukuba, Japan; Russian Institute of Radiology and Agroecology), Y. Onda (University of Tsukuba, Japan), S.V. Fesenko (Russian Institute of Radiology and Agroecology), H. Kato (University of Tsukuba, Japan)


Among natural communities, forest ecosystems are of significant interest from the radioecological point of view due to the high radiosensitivity of trees and strong ability of intercepting radionuclides falling out of the atmosphere. Compared to other plant species, confers are the most radiosensitive kinds of trees, moreover, due to their biological peculiarities their ability for self-purification is low. The aim of the research was to assess the absorbed dose rates for the Japanese cedar stands affected by the accident. The dose rate calculations were performed by a dosimetric model parameterised according to the radiocaesium measurements in different components of forest ecosystems of Fukushima Prefecture. Doses were estimated at different heights and for several periods. The calculated absorbed dose rates for Japanese cedar stands affected after the Fukushima accident varied within ~46-71 µGy/day in 2011 and ~14-21 µGy/day in 2017.The calculation results show a decrease in the dose rate since 2011.

福島事故後、電離放射線に被ばくした日本のヒマラヤスギの吸収線量率評価

R.A. Mikailova (University of Tsukuba, Japan; Russian Institute of Radiology and Agroecology), Y. Onda (University of Tsukuba, Japan), S.V. Fesenko (Russian Institute of Radiology and Agroecology), H. Kato (University of Tsukuba, Japan)


自然界の森林生態系は、樹木の放射線感受性が高いことと大気から落下する放射性核種を遮断する力が強いことから放射生態学的に大きな関心を持たれている。ヒマラヤスギは他の植物種と比べ放射線感受性が最も高い種類の樹木であり、その上、生物学的な特性により自浄作用力が低い。本調査の目的は、事故の影響を受けた日本のヒマラヤスギの立ち木での吸収線量率を評価することだった。福島県の森林生態系のさまざまな個所における放射性セシウムの測定結果に従いパラメーター表示された線量モデルで線量率計算を行った。さまざまな高さでいくつかの期間の線量を推定した。福島事故後に影響を受けた日本のヒマラヤスギの立ち木の吸収線量率計算値は、2011年に~48~80 μGy/日、2015年には~18~37 μGy/日の範囲で変化していた。計算結果は、2011年以降に線量率が低下していることを示している。

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