NDLI: Investigating Pu and U isotopic compositions in sediments: a case study in Lake Obuchi, Rokkasho Village, Japan using sector-field ICP-MS and ICP-QMS

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Investigating Pu and U isotopic compositions in sediments: a case study in Lake Obuchi, Rokkasho Village, Japan using sector-field ICP-MS and ICP-QMS

Content Provider	Royal Society of Chemistry (RSC)
Author	Zheng, Jian Yamada, Masatoshi
Copyright Year	2005
Abstract	The objectives of the present work were to study isotope ratios and the inventory of plutonium and uranium isotope compositions in sediments from Lake Obuchi, which is in the vicinity of several nuclear fuel facilities in Rokkasho, Japan. Pu and its isotopes were determined using sector-field ICP-MS and U and its isotopes were determined with ICP-QMS after separation and purification with a combination of ion-exchange and extraction chromatography. The observed 240Pu/239Pu atom ratio (0.186 ± 0.016) was similar to that of global fallout, indicating that the possible early tropospheric fallout Pu did not deliver Pu from the Pacific Proving Ground to areas above 40°N. The previously reported higher Pu inventory in the deep water area of Lake Obuchi could be attributed to the lateral transportation of Pu deposited in the shallow area which resulted from the migration of deposited global fallout Pu from the land into the lake by river runoff and from the Pacific Ocean by tide movement and sea water scavenging, as well as from direct soil input by winds. The 235U/238U atom ratios ranged from 0.00723 to 0.00732, indicating the natural origin of U in the sediments. The average 234U/238U activity ratio of 1.11 in a sediment core indicated a significant sea water U contribution. No evidence was found for the release of U containing wastes from the nearby nuclear facilities. These results will serve as a reference baseline on the levels of Pu and U in the studied site so that any further contamination from the spent nuclear fuel reprocessing plants, the radioactive waste disposal and storage facilities, and the uranium enrichment plant can be identified, and the impact of future release can be rapidly assessed.
Starting Page	792
Ending Page	797
Page Count	6
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	7
Issue Number	8
Journal	Journal of Environmental Monitoring
DOI	10.1039/b504871k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Pu Lake Obuchi Rokkasho Japan Pacific Ocean Isotope Plutonium Uranium Nuclear fuel Chromatography Plutonium-240 Plutonium-239 Pacific Proving Grounds Sediment Spent nuclear fuel Nuclear reprocessing High-level radioactive waste management Enriched uranium
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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Investigating Pu and U isotopic compositions in sediments: a case study in Lake Obuchi, Rokkasho Village, Japan using sector-field ICP-MS and ICP-QMS