Measurement of Residual^<152>Eu Activity Induced by Atomic Bomb Neutrons in Nagasaki and the Contribution of Environmental Neutrons to This Activity

Author(s)

Abstract

Residual <sup>152</sup>Eu activities induced by neutrons from the Nagasaki atomic bomb were measured for nine mineral samples located up to 1,061 m in the slant range and one control sample at 2,850 m from the hypocenter. A chemical separation to prepare europium-enriched samples was performed for all samples, and gamma ray measurements were carried out with a low background well-type germanium detector. In this paper, the measured specific activities of <sup>152</sup>Eu are compared with activation calculations based on the DS86 neutron fluence and the 93Rev one. The calculated-to-measured ratios are also compared with those of <sup>60</sup>Co and <sup>36</sup>Cl. The present results indicate that the measurements agree to the calculation within a factor of three as observed in the nuclear tests at Nevada. The activation level of environmental neutrons and the detection limit for <sup>152</sup>Eu are also discussed.<br>

Journal

  • Journal of Radiation Research

    Journal of Radiation Research 44(2), 133-139, 2003-06-15

    Journal of Radiation Research Editorial Committee

References:  27

Codes

  • NII Article ID (NAID)
    110002328876
  • NII NACSIS-CAT ID (NCID)
    AA00705792
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    04493060
  • NDL Article ID
    6610347
  • NDL Source Classification
    ZS45(科学技術--医学--放射線医学)
  • NDL Call No.
    Z53-P232
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE  NDL-Digital 
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