Authors:
M. Yamada National Institute of Radiological Sciences Geochemical Research Section, Research Center for Radioecology Isozaki 3609, Hitachinaka Ibaraki 311-1202 Japan

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Y. Nagaya National Institute of Radiological Sciences Geochemical Research Section, Research Center for Radioecology Isozaki 3609, Hitachinaka Ibaraki 311-1202 Japan

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Abstract  

Marine sediment cores were taken from Sagami Bay of the western Northwest Pacific and analyzed for 239+240Pu and 137Cs activities. A significant correlation was observed between 239+240Pu and 137Cs activities in sediment cores, i.e., their vertical profiles. The measured activities which were used to obtain the inventories of 239+240Pu and 137Cs in the sediment column, showed large variations, ranging from 36 to 474 MBq/km2 for 239+240Pu and 49 to 652 MBq/km2 for 137Cs. 239+240Pu inventories in the sediment from one region in the Bay, Sagami Nada were 5–10 times greater than those predicted from atmospheric global fallout 42 MBq/km2 at the same latitude. On the other hand, 137Cs inventories, with a mean value of 297±168 MBq/km2, were much less than predicted, 2040 MBq/km2. The activity ratios of 239+240Pu/137Cs obtained, with a mean of 0.65±0.17, were significantly greater than the ratio predicted from fallout, 0.021. Furthermore, there was a clear relationship between both 239+240Pu and 137Cs inventories and the water content, indicating that higher inventories may be attributed principally to concentration in, and scavenging by, fine-grained particles.

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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)