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Development and deployment of an underway radioactive cesium monitor off the Japanese coast near Fukushima Dai'ichi

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https://ir.library.oregonstate.edu/concern/articles/j38608045

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  • A custom radiation monitoring system was developed by Oregon State University at the request of the Woods Hole Oceanographic Institute to measure radioactive cesium contaminants in the ocean waters near Fukushima Dai’ichi Nuclear Power Plant. The system was to be used on board the R/V Ka’imikai-O-Kanaloa during a 15 d research cruise to provide real-time approximations of radionuclide concentration and alert researchers to the possible occurrence of highly elevated radionuclide concentrations. A NaI(Tl) scintillation detector was coupled to a custom-built compact digital spectroscopy system and suspended within a sealed tank of continuously flowing seawater. A series of counts were acquired within an energy region corresponding to the main photopeak of ¹³⁷Cs. The system was calibrated using known quantities of radioactive ¹³⁴Cs and ¹³⁷Cs in a ratio equating to that present at the reactors’ ocean outlet. The response between net count rate and concentration of ¹³⁷Cs was then used to generate temporal and geographic plots of ¹³⁷Cs concentration throughout the research cruise in Japanese coastal waters. The concentration of ¹³⁷Cs was low but detectable, reaching a peak of 3.8 ± 0.2 Bq/L.
  • This is the author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier and can be found at: http://www.journals.elsevier.com/journal-of-environmental-radioactivity/.
  • Keywords: Monitor, Fukushima, Seawater, Flow-through, Dai-ichi, Radiocesium
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  • Caffrey, J. A., Higley, K. A., Farsoni, A. T., Smith, S., & Menn, S. (2012). Development and deployment of an underway radioactive cesium monitor off the japanese coast near fukushima dai-ichi. Journal of Environmental Radioactivity, 111, 120-125. doi: 10.1016/j.jenvrad.2011.12.015
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  • 111
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  • The Fukushima research cruise and related work was funded through sponsorship from the Gordon and Betty Moore Foundation and the National Science Foundation.
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