Authors:
K. Hirose Geochemical Research Department, Meteorological Research Institute Nagamine 1-1, Ibaraki 305-0052, Japan

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M. Aoyama Geochemical Research Department, Meteorological Research Institute Nagamine 1-1, Ibaraki 305-0052, Japan

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Y. Igarashi Geochemical Research Department, Meteorological Research Institute Nagamine 1-1, Ibaraki 305-0052, Japan

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K. Komura Low Level Radioactivity Laboratory, Kanazawa University Wake, Tatsunokuchi, Ishikawa 923-1224, Japan

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Summary  

137Cs concentrations in seawater collected in 2002 and archived samples collected in 1957 were determined by using an AMP precipitation method and γ -spectrometry. 137Cs concentrations in the present water columns (>0.2 Bq . m-3) were determined using sample volumes of around 10 liters by the AMP precipitation method and ground-level γ-spectrometry at the Meteorological Research Institute (MRI). Equipment at the Ogoya Underground Laboratory (OUL) is able to achieve very low radioactivity measurements. As a result, we were able to measure 137Cs concentrations in deep waters (100-1500 m) in 1957, of about 1 Bq . m-3 from a small volume (250 ml) of the archived samples. The high sensitive 137Cs measurements allow effectively using 137Cs as a tracer of water motion in the ocean.

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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)