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

Mizuki Suetake, Yuriko Nakano, Genki Furuki, Ryohei Ikehara, Tatsuki Komiya, Eitaro Kurihara, Kazuya Morooka, Shinya Yamasaki, Toshihiko Ohnuki, Kenji Horie, Mami Takehara, Gareth T.W. Law, William Bower, Bernd Grambow, Rodney C. Ewing, Satoshi Utsunomiya

Research output: Contribution to journalArticle

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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 137Cs) using three types of solutions: simulated lung fluid, ultrapure water, and artificial sea water, at 25 and 37 °C for 1–63 days. The 137Cs was released rapidly within three days and then steady-state dissolution was achieved for each solution type. The steady-state 137Cs release rate at 25 °C was determined to be 4.7 × 103, 1.3 × 103, and 1. 3 × 103 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 ∼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.

Original languageEnglish
Pages (from-to)633-644
Number of pages12
JournalChemosphere
Volume233
DOIs
Publication statusPublished - Oct 1 2019

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Nuclear Power Plants
Cesium
cesium
Seawater
nuclear power plant
Nuclear power plants
Dissolution
dissolution
seawater
Lung
Fluids
fluid
Water
water
Silicates
durability
Glass
Durability
Moisture
Soil

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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

In: Chemosphere, Vol. 233, 01.10.2019, p. 633-644.

Research output: Contribution to journalArticle

Suetake, M, Nakano, Y, Furuki, G, Ikehara, R, Komiya, T, Kurihara, E, Morooka, K, Yamasaki, S, Ohnuki, T, Horie, K, Takehara, M, Law, GTW, Bower, W, Grambow, B, Ewing, RC & 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
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. / Dissolution of radioactive, cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant in simulated lung fluid, pure-water, and seawater. In: Chemosphere. 2019 ; Vol. 233. pp. 633-644.
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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 137Cs) using three types of solutions: simulated lung fluid, ultrapure water, and artificial sea water, at 25 and 37 °C for 1–63 days. The 137Cs was released rapidly within three days and then steady-state dissolution was achieved for each solution type. The steady-state 137Cs release rate at 25 °C was determined to be 4.7 × 103, 1.3 × 103, and 1. 3 × 103 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 ∼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.",
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AU - Suetake, Mizuki

AU - Nakano, Yuriko

AU - Furuki, Genki

AU - Ikehara, Ryohei

AU - Komiya, Tatsuki

AU - Kurihara, Eitaro

AU - Morooka, Kazuya

AU - Yamasaki, Shinya

AU - Ohnuki, Toshihiko

AU - Horie, Kenji

AU - Takehara, Mami

AU - Law, Gareth T.W.

AU - Bower, William

AU - Grambow, Bernd

AU - Ewing, Rodney C.

AU - Utsunomiya, Satoshi

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N2 - 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 137Cs) using three types of solutions: simulated lung fluid, ultrapure water, and artificial sea water, at 25 and 37 °C for 1–63 days. The 137Cs was released rapidly within three days and then steady-state dissolution was achieved for each solution type. The steady-state 137Cs release rate at 25 °C was determined to be 4.7 × 103, 1.3 × 103, and 1. 3 × 103 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 ∼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.

AB - 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 137Cs) using three types of solutions: simulated lung fluid, ultrapure water, and artificial sea water, at 25 and 37 °C for 1–63 days. The 137Cs was released rapidly within three days and then steady-state dissolution was achieved for each solution type. The steady-state 137Cs release rate at 25 °C was determined to be 4.7 × 103, 1.3 × 103, and 1. 3 × 103 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 ∼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.

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