Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea

Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea

A total of 30 surface water samples were collected at 2 sites on the east side of the East China Sea (ECS) during 2008–20f0, and 226Ra, 228Ra, and 228Th activities were measured using low-background γ-spectrometry. The 228Ra/226Ra and 228Th/228Ra activity ratios of the samples exhibited notable seas...

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Main Authors: Hamajima Y., Nagao S., Kofuji H., Minakawa M., Kiyomoto Y., Inoue M., Yoshida K., Yamamoto M.
Format: Article
Language:English
Published: EDP Sciences 2012-04-01
Series:EPJ Web of Conferences
Online Access:http://dx.doi.org/10.1051/epjconf/20122404005
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spelling doaj-f507d282278343798598b773a6b356202021-08-02T02:09:23ZengEDP SciencesEPJ Web of Conferences2100-014X2012-04-01240400510.1051/epjconf/20122404005Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China SeaHamajima Y.Nagao S.Kofuji H.Minakawa M.Kiyomoto Y.Inoue M.Yoshida K.Yamamoto M.A total of 30 surface water samples were collected at 2 sites on the east side of the East China Sea (ECS) during 2008–20f0, and 226Ra, 228Ra, and 228Th activities were measured using low-background γ-spectrometry. The 228Ra/226Ra and 228Th/228Ra activity ratios of the samples exhibited notable seasonal variations (228Ra/226Ra = 0.2–3.3; 228Th/228Ra = < 0.1–0.4) accompanying salinity changes (31.0–34.6). These changes are hypothesized to cause the change by altering the mixing ratio of 228Ra-rich and particle-rich continental shelf water within the ECS. http://dx.doi.org/10.1051/epjconf/20122404005
collection DOAJ
language English
format Article
sources DOAJ
author Hamajima Y.
Nagao S.
Kofuji H.
Minakawa M.
Kiyomoto Y.
Inoue M.
Yoshida K.
Yamamoto M.
spellingShingle Hamajima Y.
Nagao S.
Kofuji H.
Minakawa M.
Kiyomoto Y.
Inoue M.
Yoshida K.
Yamamoto M.
Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea
EPJ Web of Conferences
author_facet Hamajima Y.
Nagao S.
Kofuji H.
Minakawa M.
Kiyomoto Y.
Inoue M.
Yoshida K.
Yamamoto M.
author_sort Hamajima Y.
title Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea
title_short Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea
title_full Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea
title_fullStr Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea
title_full_unstemmed Seasonal variations of 228Ra/226Ra and 228Th/228Ra ratios in surface water from the eastern East China Sea
title_sort seasonal variations of 228ra/226ra and 228th/228ra ratios in surface water from the eastern east china sea
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2012-04-01
description A total of 30 surface water samples were collected at 2 sites on the east side of the East China Sea (ECS) during 2008–20f0, and 226Ra, 228Ra, and 228Th activities were measured using low-background γ-spectrometry. The 228Ra/226Ra and 228Th/228Ra activity ratios of the samples exhibited notable seasonal variations (228Ra/226Ra = 0.2–3.3; 228Th/228Ra = < 0.1–0.4) accompanying salinity changes (31.0–34.6). These changes are hypothesized to cause the change by altering the mixing ratio of 228Ra-rich and particle-rich continental shelf water within the ECS.
url http://dx.doi.org/10.1051/epjconf/20122404005
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