Abstract
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 <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....Continue Reading
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Citations
Dec 13, 2019·Science and Engineering Ethics·Jessica MorleyAnat Elhalal
Nov 23, 2020·Chemosphere·Takahito IkenoueSatoshi Utsunomiya
Dec 1, 2020·Chemosphere·Alexei KonoplevKenji Nanba
Jul 15, 2020·The Science of the Total Environment·Eitaro KuriharaSatoshi Utsunomiya
Jun 14, 2019·Chemosphere·Mizuki SuetakeSatoshi Utsunomiya
Oct 15, 2019·Chemosphere·Ryohei IkeharaSatoshi Utsunomiya
Mar 13, 2021·Scientific Reports·Hikaru MiuraYoshio Takahashi
May 5, 2021·The Science of the Total Environment·Kazuya MorookaSatoshi Utsunomiya
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