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  

Four sediment cores were collected from Tokyo Bay and analyzed for their 239+240Pu and 137Cs concentrations. Shallow nearshore sediments from Tokyo Bay have 239+240Pu inventories which average 214±14 MBq/km2. They are five times greater than the supply expected from the atmospheric global fallout at the same latitude of 42 MBq/km2. The measured mean 137Cs inventory of 433±93 MBq/km2 is approximately one fifth the value expected from global fallout. Furthermore, the 239+240Pu/137Cs activity ratios, with a mean ratio of 0.50±0.14, are significantly greater than the ratio expected from the global fallout of 0.021. Excess 239+240Pu inventories can be considered to have been introduced into Tokyo Bay as weathering products by soil erosion, transported via rivers and winds, and to be much more efficiently scavenged from seawater by particles resuspended at the sediment-water interface.

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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)