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

Environmental Science & Technology
Ryohei IkeharaSatoshi Utsunomiya

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

References

Mar 5, 2004·Environmental Science & Technology·James P McKinleySteve R Sutton
Nov 16, 2011·Proceedings of the National Academy of Sciences of the United States of America·Norikazu KinoshitaTakeyasu Yamagata
Apr 27, 2012·Environmental Science & Technology·Naoki KaneyasuFumikazu Ikemori
Nov 6, 2013·The Science of the Total Environment·Georg SteinhauserThomas E Johnson
Oct 25, 2014·Environmental Science & Technology·Hiroki MukaiToshihiro Kogure
Feb 15, 2016·The Science of the Total Environment·Shinya YamasakiSatoshi Utsunomiya
Jul 1, 2016·Annual Review of Marine Science·Ken BuesselerJohn N Smith

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Citations

Jul 15, 2020·The Science of the Total Environment·Eitaro KuriharaSatoshi Utsunomiya
May 5, 2021·The Science of the Total Environment·Kazuya MorookaSatoshi Utsunomiya

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