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Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama

The opportunity to measure the concentrations of (3)H and (36)Cl released by the Fukushima nuclear accident in 2011 directly in rain was lost in the early stage of the accident. We have, however, been able to reconstruct the deposition record of atmospheric (3)H and (36)Cl following the accident usi...

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Autores principales: Ohta, Tomoko, Fifield, L. Keith, Palcsu, László, Tims, Stephen G., Pavetich, Stefan, Mahara, Yasunori
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10640602/
https://www.ncbi.nlm.nih.gov/pubmed/37952016
http://dx.doi.org/10.1038/s41598-023-46853-y
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author Ohta, Tomoko
Fifield, L. Keith
Palcsu, László
Tims, Stephen G.
Pavetich, Stefan
Mahara, Yasunori
author_facet Ohta, Tomoko
Fifield, L. Keith
Palcsu, László
Tims, Stephen G.
Pavetich, Stefan
Mahara, Yasunori
author_sort Ohta, Tomoko
collection PubMed
description The opportunity to measure the concentrations of (3)H and (36)Cl released by the Fukushima nuclear accident in 2011 directly in rain was lost in the early stage of the accident. We have, however, been able to reconstruct the deposition record of atmospheric (3)H and (36)Cl following the accident using a bore hole that was drilled in 2014 at Koriyama at a distance of 60 km from the accident. The contributions of (3)H and (36)Cl from the accident are 1.4 × 10(13) and 2.0 × 10(12) atoms m(−2) respectively at this site. Very high concentrations of both (3)H (46 Bq L(−1)) and (36)Cl (3.36 × 10(11) atoms L(−1)) were found in the unsaturated soil at depths between 300 and 350 cm. From these, conservative estimates for the (3)H and (36)Cl concentrations in the precipitation in the ~ 6 weeks following the accident were 607 Bq L(−1) and 4.74 × 10(10) atoms L(−1), respectively. A second hole drilled in 2016 showed that (3)H concentrations in the unsaturated soil and shallow groundwater had returned to close to natural levels, although the (36)Cl concentrations were still significantly elevated above natural levels.
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spelling pubmed-106406022023-11-11 Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama Ohta, Tomoko Fifield, L. Keith Palcsu, László Tims, Stephen G. Pavetich, Stefan Mahara, Yasunori Sci Rep Article The opportunity to measure the concentrations of (3)H and (36)Cl released by the Fukushima nuclear accident in 2011 directly in rain was lost in the early stage of the accident. We have, however, been able to reconstruct the deposition record of atmospheric (3)H and (36)Cl following the accident using a bore hole that was drilled in 2014 at Koriyama at a distance of 60 km from the accident. The contributions of (3)H and (36)Cl from the accident are 1.4 × 10(13) and 2.0 × 10(12) atoms m(−2) respectively at this site. Very high concentrations of both (3)H (46 Bq L(−1)) and (36)Cl (3.36 × 10(11) atoms L(−1)) were found in the unsaturated soil at depths between 300 and 350 cm. From these, conservative estimates for the (3)H and (36)Cl concentrations in the precipitation in the ~ 6 weeks following the accident were 607 Bq L(−1) and 4.74 × 10(10) atoms L(−1), respectively. A second hole drilled in 2016 showed that (3)H concentrations in the unsaturated soil and shallow groundwater had returned to close to natural levels, although the (36)Cl concentrations were still significantly elevated above natural levels. Nature Publishing Group UK 2023-11-11 /pmc/articles/PMC10640602/ /pubmed/37952016 http://dx.doi.org/10.1038/s41598-023-46853-y Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Ohta, Tomoko
Fifield, L. Keith
Palcsu, László
Tims, Stephen G.
Pavetich, Stefan
Mahara, Yasunori
Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama
title Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama
title_full Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama
title_fullStr Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama
title_full_unstemmed Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama
title_short Record of (3)H and (36)Cl from the Fukushima nuclear accident recovered from soil water in the unsaturated zone at Koriyama
title_sort record of (3)h and (36)cl from the fukushima nuclear accident recovered from soil water in the unsaturated zone at koriyama
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10640602/
https://www.ncbi.nlm.nih.gov/pubmed/37952016
http://dx.doi.org/10.1038/s41598-023-46853-y
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