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Novel Method of Quantifying Radioactive Cesium-Rich Microparticles (CsMPs) in the Environment from the Fukushima Daiichi Nuclear Power Plant

Highly radioactive cesium-rich microparticles (CsMPs) were released from the Fukushima Daiichi nuclear power plant (FDNPP) to the surrounding environment at an early stage of the nuclear disaster in March of 2011; however, the quantity of released CsMPs remains undetermined. Here, we report a novel...

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Published in:Environmental science & technology 2018-06, Vol.52 (11), p.6390-6398
Main Authors: Ikehara, Ryohei, Suetake, Mizuki, Komiya, Tatsuki, Furuki, Genki, Ochiai, Asumi, Yamasaki, Shinya, Bower, William R, Law, Gareth T. W, Ohnuki, Toshihiko, Grambow, Bernd, Ewing, Rodney C, Utsunomiya, Satoshi
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container_issue 11
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creator Ikehara, Ryohei
Suetake, Mizuki
Komiya, Tatsuki
Furuki, Genki
Ochiai, Asumi
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Bower, William R
Law, Gareth T. W
Ohnuki, Toshihiko
Grambow, Bernd
Ewing, Rodney C
Utsunomiya, Satoshi
description Highly radioactive cesium-rich microparticles (CsMPs) were released from the Fukushima Daiichi nuclear power plant (FDNPP) to the surrounding environment at an early stage of the nuclear disaster in March of 2011; however, the quantity of released CsMPs remains undetermined. Here, we report a novel method to quantify the number of CsMPs in surface soils at or around Fukushima and the fraction of radioactivity they contribute, which we call “quantification of CsMPs” (QCP) and is based on autoradiography. Here, photostimulated luminescence (PSL) is linearly correlated to the radioactivity of various microparticles, with a regression coefficient of 0.0523 becquerel/PSL/h (Bq/PSL/h). In soil collected from Nagadoro, Fukushima, Japan, CsMPs were detected in soil sieved with a 114 μm mesh. There was no overlap between the radioactivities of CsMPs and clay particles adsorbing Cs. Based on the distribution of radioactivity of CsMPs, the threshold radioactivity of CsMPs in the size fraction of
doi_str_mv 10.1021/acs.est.7b06693
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Here, photostimulated luminescence (PSL) is linearly correlated to the radioactivity of various microparticles, with a regression coefficient of 0.0523 becquerel/PSL/h (Bq/PSL/h). In soil collected from Nagadoro, Fukushima, Japan, CsMPs were detected in soil sieved with a 114 μm mesh. There was no overlap between the radioactivities of CsMPs and clay particles adsorbing Cs. Based on the distribution of radioactivity of CsMPs, the threshold radioactivity of CsMPs in the size fraction of &lt;114 μm was determined to be 0.06 Bq. Based on this method, the number and radioactivity fraction of CsMPs in four surface soils collected from the vicinity of the FDNPP were determined to be 48–318 particles per gram and 8.53–31.8%, respectively. The QCP method is applicable to soils with a total radioactivity as high as ∼106 Bq/kg. 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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Airborne particulates
Autoradiography
Cesium
Chemical Sciences
Computational chemistry
Environmental impact
Mathematical models
Microparticles
Migration
Nuclear accidents
Nuclear energy
Nuclear power plants
Radioactive materials
Radioactivity
Radiochemistry
Regression coefficients
Soil surfaces
Soils
title Novel Method of Quantifying Radioactive Cesium-Rich Microparticles (CsMPs) in the Environment from the Fukushima Daiichi Nuclear Power Plant
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