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Journal of Radioanalytical and Nuclear Chemistry

, Volume 263, Issue 2, pp 349–353 | Cite as

Ultra-sensitive mass spectrometric and other methods applied to environmental problems

Extremely low background measurements of <Superscript>137</Superscript>Cs in seawater samples using an underground facility (Ogoya)
  • K. Hirose
  • M. Aoyama
  • Y. Igarashi
  • K. Komura
Article

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.

Keywords

Seawater Sample 137Cs Activity 137Cs Concentration Archive Sample Meteorological Research Institute 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Akad&#233;miai Kiad&#243; 2005

Authors and Affiliations

  • K. Hirose
    • 1
  • M. Aoyama
    • 2
  • Y. Igarashi
    • 3
  • K. Komura
    • 4
  1. 1.Geochemical Research Department, Meteorological Research Institute
  2. 2.Geochemical Research Department, Meteorological Research Institute
  3. 3.Geochemical Research Department, Meteorological Research Institute
  4. 4.Low Level Radioactivity Laboratory, Kanazawa University

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