Controls on anthropogenic radionuclide distribution in the Sellafield-impacted Eastern Irish Sea.
Controls on anthropogenic radionuclide distribution in the Sellafield-impacted Eastern Irish Sea.
复制标题
对受塞拉菲尔德影响的东爱尔兰海人为放射性核素分布的控制。
DOI:
10.1016/j.scitotenv.2020.140765
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Ray D
中科院分区:
文献类型:
--
作者:
Ray D
Understanding anthropogenic radionuclide biogeochemistry and mobility in natural systems is key to improving the management of radioactively contaminated environments and radioactive wastes. Here, we describe the contemporary depth distribution and phase partitioning of137Cs, Pu, and241Am in two sediment cores taken from the Irish Sea (Site 1: the Irish Sea Mudpatch; Site 2: the Esk Estuary). Both sites are located ~10 km from the Sellafield nuclear site. Low-level aqueous radioactive waste has been discharged from the Sellafield site into the Irish Sea for >50 y. We compare the depth distribution of the radionuclides at each site to trends in sediment and porewater redox chemistry, using trace element abundance, microbial ecology, and sequential extractions, to better understand the relative importance of sediment biogeochemistry vs. physical controls on radionuclide distribution/post-depositional mobility in the sediments. We highlight that the distribution of137Cs, Pu, and241Am at both sites is largely controlled by physical mixing of the sediments, physical transport processes, and sediment accumulation. Interestingly, at the Esk Estuary, microbially-mediated redox processes (considered for Pu) do not appear to offer significant controls on Pu distribution, even over decadal timescales. We also highlight that the Irish Sea Mudpatch likely still acts as a source of historical pollution to other areas in the Irish Sea, despite ever decreasing levels of waste output from the Sellafield site.
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DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
A. Morgenstern;G. Choppin
通讯作者:
G. Choppin
DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
A. B. Mackenzie;G. Cook;P. McDonald;S. R. Jones
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2.8
作者:
L. Romanenko;N. Tanaka;G. Frolova;V. Mikhailov
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V. Mikhailov
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
P. Kershaw;D. Denoon;D. Woodhead
通讯作者:
D. Woodhead
影响因子:
4.2
作者:
A. B. Mackenzie;R. Scott
通讯作者:
R. Scott