Dissolution of radioactive, cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant in simulated lung fluid, pure-water, and seawater

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Suetake , M , Nakano , Y , Furuki , G , Ikehara , R , Komiya , T , Kurihara , E , Morooka , K , Yamasaki , S , Ohnuki , T , Horie , K , Takehara , M , Law , G T W , Bower , W , Grambow , B , Ewing , R C & Utsunomiya , S 2019 , ' Dissolution of radioactive, cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant in simulated lung fluid, pure-water, and seawater ' , Chemosphere , vol. 233 , pp. 633-644 . https://doi.org/10.1016/j.chemosphere.2019.05.248

Title: Dissolution of radioactive, cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant in simulated lung fluid, pure-water, and seawater
Author: Suetake, Mizuki; Nakano, Yuriko; Furuki, Genki; Ikehara, Ryohei; Komiya, Tatsuki; Kurihara, Eitaro; Morooka, Kazuya; Yamasaki, Shinya; Ohnuki, Toshihiko; Horie, Kenji; Takehara, Mami; Law, Gareth T.W.; Bower, William; Grambow, Bernd; Ewing, Rodney C.; Utsunomiya, Satoshi
Other contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2019-10
Language: eng
Number of pages: 12
Belongs to series: Chemosphere
ISSN: 0045-6535
DOI: https://doi.org/10.1016/j.chemosphere.2019.05.248
URI: http://hdl.handle.net/10138/325469
Abstract: To understand the chemical durability of highly radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant in March 2011, we have, for the first time, performed systematic dissolution experiments with CsMPs isolated from Fukushima soils (one sample with 108 Bq and one sample with 57.8 Bq of Cs-137) using three types of solutions: simulated lung fluid, ultrapure water, and artificial sea water, at 25 and 37 degrees C for 1-63 days. The Cs-137 was released rapidly within three days and then steady-state dissolution was achieved for each solution type. The steady-state Cs-137 release rate at 25 degrees C was determined to be 4.7 x 10(3), 1.3 x 10(3), and 1.3 x 10(3) Bq . m(-2)s(-1) for simulated lung fluid, ultrapure water, and artificial sea water, respectively. This indicates that the simulated lung fluid promotes the dissolution of CsMPs. The dissolution of CsMPs is similar to that of Si-based glass and is affected by the surface moisture conditions. In addition, the Cs release from the CsMPs is constrained by the rate-limiting dissolution of silicate matrix. Based on our results, CsMPs with similar to 2 Bq, which can be potentially inhaled and deposited in the alveolar region, are completely dissolved after >35 years. Further, CsMPs could remain in the environment for several decades; as such, CsMPs are important factors contributing to the long-term impacts of radioactive Cs in the environment. (C) 2019 Elsevier Ltd. All rights reserved.
Subject: ALLOY
BASALTIC GLASS DISSOLUTION
CONSEQUENCES
HYDROXYAPATITE
KINETICS
MECHANISM
PH
RATES
SILICA
TEMPERATURE
116 Chemical sciences
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