Journal of Radioanalytical and Nuclear Chemistry
Volume/Issue:
Volume 147: Issue 1
Distribution of global fallout237Np, Pu isotopes, and241Am in lake and sea sediments
Authors:
M. Yamamoto Low Level Radioactivity Laboratory Kanazawa University 923-12 Tatsunokuchi, Ishikawa (Japan)

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Y. Yamauchi Low Level Radioactivity Laboratory Kanazawa University 923-12 Tatsunokuchi, Ishikawa (Japan)

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K. Chatani Low Level Radioactivity Laboratory Kanazawa University 923-12 Tatsunokuchi, Ishikawa (Japan)

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S. Igarashi Fukui Prefectural Institute of Public Health 910 Harame, Fukui (Japan)

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K. Komura Low Level Radioactivity Laboratory Kanazawa University 923-12 Tatsunokuchi, Ishikawa (Japan)

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K. Ueno Low Level Radioactivity Laboratory Kanazawa University 923-12 Tatsunokuchi, Ishikawa (Japan)

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M. Sakanoue Low Level Radioactivity Laboratory Kanazawa University 923-12 Tatsunokuchi, Ishikawa (Japan)

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Pages:
165–176
Online Publication Date:
13 Aug 2005
Publication Date:
17 Jan 1991
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02039578
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Abstract  

In order to investigate the sedimentary behaviour of neptunium,237Np together with Pu isotopes and241Am have been measured for the sediment cores collected from Lake Mikata (freshwater) and from Lake Kugushi (brakish water) both belonging to the Mikata Five Lakes, and from Nyu Bay (sea water). In all sediment core samples237Np was detected, and its concentrations were far below those of239,240Pu and241Am measured for the same samples. Inventories of237Np in Lake Mikata, Lake Kugushi and Nyu Bay were estimated to be 0.53, 0.29 and 0.34 MBq/km2, respectively. The activity ratio of237Np/239,240Pu calculted from the inventories in each sediment core was 0.29% for Lake Mikata, 0.15% for Lake Kugushi and 0.10% for Nyu Bay. These values except for the value for Lake Mikata are two or three times lower than the value of 0.3–0.4% observed for surface soils of 0–20 cm depth, suggesting that Np is more soluble compared with Pu.

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Cover Journal of Radioanalytical and Nuclear Chemistry
Journal of Radioanalytical and Nuclear Chemistry
Print ISSN:
0236-5731
Online ISSN:
1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation		 1968
Volumes
per Year		 1
Issues
per Year		 12
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)

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