Radiocesium in North Pacific coastal and offshore areas of Japan within several months after the Fukushima accident.
J Environ Radioact
; 198: 79-88, 2019 Mar.
Article
en En
| MEDLINE
| ID: mdl-30593926
ABSTRACT
We measured activity concentrations of radiocesium (134Cs and 137Cs) in seawater samples collected in North Pacific coastal and offshore areas of Japan within several months after the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident in March 2011, including archived seawater samples whose radiocesium concentrations were previously reported to be below detection limits. By merging 329 new data with published results, we succeeded in reconstructing the temporal changes in activity concentrations and inventories of FNPP1-derived radiocesium in the coastal and offshore areas within several months after the accident for the first time. 137Cs directly-discharged from the FNPP1 was transported eastward within the coastal area about 250â¯km from the FNPP1 during two months after the accident due to complex movements of coastal surface currents. The eastward speed was calculated to be about 5â¯cmâ¯s-1. Eastward transport of 137Cs to the offshore area more than 600â¯km away from the FNPP1 along the north flank of the Kuroshio Extension Current was faster (about 9â¯cmâ¯s-1) and probably more dominant in the eastward transport. The total inventory of directly-discharged 137Cs in early April 2011 was estimated to be 3-6 PBq approximately, which agrees with the smaller estimates in previous studies (2-6 PBq).
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Contaminantes Radiactivos del Agua
/
Radioisótopos de Cesio
/
Monitoreo de Radiación
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Accidente Nuclear de Fukushima
País/Región como asunto:
Asia
Idioma:
En
Revista:
J Environ Radioact
Asunto de la revista:
SAUDE AMBIENTAL
Año:
2019
Tipo del documento:
Article