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Recent trends of plutonium fallout observed in Japan: Comparison with natural lithogenic radionuclides, thorium isotopes

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Abstract

Plutonium was determined in monthly atmospheric deposition samples from 2000 to the end of 2003 collected at Tsukuba, Japan, together with monthly thorium deposition. Monthly 239,240Pu and thorium depositions showed a typical seasonal variation with a maximum in spring. The 230Th/232Th activity ratios in the deposition samples differed from that of surface soils near Tsukuba. These results reveal that a significant part of the 239,240Pu deposition observed in Japan is attributable to resuspension of deposited plutonium originating from the East Asian continent deserts and arid areas.

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Authors and Affiliations

  1. Geochemical Research Department, Meteorological Research Institute, Nagamine1-1, Tsukuba, Ibaraki, 305-0052, Japan

    K. Hirose, Y. Igarashi & M. Aoyama

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  1. K. Hirose
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  2. Y. Igarashi
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  3. M. Aoyama
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Hirose, K., Igarashi, Y. & Aoyama, M. Recent trends of plutonium fallout observed in Japan: Comparison with natural lithogenic radionuclides, thorium isotopes. J Radioanal Nucl Chem 273, 115–118 (2007). https://doi.org/10.1007/s10967-007-0720-1

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  • DOI: https://doi.org/10.1007/s10967-007-0720-1

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