Distribution and Evolution of Fukushima Dai-ichi derived 137Cs, 90Sr, and 129I in Surface Seawater off the Coast of Japan
Kenyon, Jennifer A. (Woods Hole Oceanographic Institution)
Buesseler, Ken (Woods Hole Oceanographic Institution)
Casacuberta Arola, Núria (Laboratory of Ion Beam Physics)
Castrillejo, Maxi (Laboratory of Ion Beam Physics)
Otosaka, Shigeyoshi (University of Tokyo)
Masqué Barri, Pere (Universitat Autònoma de Barcelona. Departament de Física)
Drysdale, Jessica A. (Woods Hole Oceanographic Institution)
Pike, Steven M. (Woods Hole Oceanographic Institution)
Sanial, Virginie (Université de Toulon)
Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals

Fecha:	2020
Resumen:	The Fukushima Dai-ichi Nuclear Power Plants (FDNPPs) accident in 2011 led to an unprecedented release of radionuclides into the environment. Particularly important are 90Sr and 137Cs due to their known health detriments and long half-lives (T1/2 ≈ 30 y) relative to ecological systems. These radionuclides can be combined with the longer-lived 129I (T1/2 = 15. 7 My) to trace hydrologic, atmospheric, oceanic, and geochemical processes. This study seeks to evaluate 137Cs, 90Sr, and 129I concentrations in seawater off the coast of Japan, reconcile the sources of contaminated waters, and assess the application of 137Cs/90Sr, 129I/137Cs, and 129I/90Sr as oceanic tracers. We present new data from October 2015 and November 2016 off the coast of Japan, with observed concentrations reaching up to 198 ± 4 Bq·m-3 for 137Cs, 9. 1 ± 0. 7 Bq·m-3 for 90Sr, and (114 ± 2) × 10-5 Bq·m-3 for 129I. The utilization of activity ratios suggests a variety of sources, including sporadic and independent releases of radiocontaminants. Though overall concentrations are decreasing, concentrations are still elevated compared to pre-accident levels. In addition, Japan's Environment Minister has suggested that stored water from the FDNPPs may be released into the environment and thus continued efforts to understand the fate and distribution of these radionuclides is warranted.
Ayudas:	European Commission 604974 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1588 Ministerio de Economía y Competitividad MDM2015-0552 Ministerio de Educación, Cultura y Deporte AP-2012-2901
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Environmental Science & Technology, Vol. 54, Issue 23 (December 2020) , p. 15066-15075, ISSN 1520-5851

DOI: 10.1021/acs.est.0c05321
PMID: 33170656

10 p, 4.4 MB

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