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論文

Modelling the effect of mechanical remediation on dose rates above radiocesium contaminated land

Malins, A.; 操上 広志; 北村 哲浩; 町田 昌彦

Remediation Measures for Radioactively Contaminated Areas, p.259 - 272, 2019/00

Mechanical strategies for remediating radiocesium contaminated soils, e.g. at farms, schoolyards, gardens or parks, lower air dose rates in one of two characteristic ways. The first is to physically remove radiocesium from the environment, for example by stripping topsoil and sending it for disposal. The second is to redistribute the radiocesium deeper within the ground, e.g. by mixing the topsoil or switching the positions of different soil layers, in order that soil attenuates radiocesium gamma rays before they reach the surface. The amount that air dose rates reduce because of remediation can be calculated using radiation transport methods. This chapter summarizes modelling results for the effect of topsoil removal (with and without recovering with a clean soil layer), topsoil mixing, and soil layer interchange on dose rates. Using measurements of the depth profile of $$^{134}$$Cs and $$^{137}$$Cs activity in soil at un-remediated sites across North East Japan, the potential effectiveness of remediation work was estimated considering remediation to different soil depths and different time lags after the accident. The results show that remediation performance would have been essentially constant irrespective of the time at which it was undertaken in the initial five year period following the fallout.

論文

Profiles of activity ratios of fission products, cesium-134,cesium-137 and ruthenium-106 in low-enriched PuO$$_{2}$$-UO$$_{2}$$ fuel assemblies

鶴田 晴通; 須崎 武則; 松浦 祥次郎

Journal of Nuclear Science and Technology, 14(1), p.43 - 53, 1977/01

 被引用回数:4

照射済PuO$$_{2}$$-UO$$_{2}$$燃料集合体内の核分裂生成物の分布を、Ge(Li)検出器を用いた$$gamma$$線スペクトロスコピ法によって非破壊的に測定した。PuO$$_{2}$$-UO$$_{2}$$燃料の場合について、$$^{1}$$$$^{3}$$$$^{7}$$Cs強度と$$^{1}$$$$^{3}$$$$^{4}$$Cs/$$^{1}$$$$^{3}$$$$^{7}$$Cs強度比の間に比例関係のあることを確証した。$$^{1}$$$$^{0}$$$$^{6}$$Ru/$$^{1}$$$$^{3}$$$$^{7}$$Cs比の分布は集合体内でほとんど一定であり、この比は照射済燃料がPuまたはUであったかを識別するための良い指標になることを示した。

口頭

PHITS models for ambient dose equivalent rates in Fukushima's Radiocesium contaminated forests

Malins, A.; 今村 直広*; 新里 忠史; Kim, M.; 佐久間 一幸; 篠宮 佳樹*; 三浦 覚*; 町田 昌彦

no journal, , 

PHITS Monte Carlo models were used to assess factors affecting ambient dose equivalent rates (H*(10)) in forests in Fukushima Prefecture. Three models were developed with different levels of detail to understand how the distribution of radioactive cesium within forests, shielding by trees and soil composition affect H*(10). The models were parametrized using measurements from deciduous and coniferous forests in Fukushima Prefecture.

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