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


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.


Seawater Sample 137Cs Activity 137Cs Concentration Archive Sample Meteorological Research Institute 
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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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