Microdosimetry on a Mini-Reactor UTR-KINKI for Educational Uses and Biological Researches

Author(s)

Abstract

Microdosimetry study has been carried out at the education and research mini-reactor of Kinki University (UTR-KINKI) using a tissue equivalent gas proportional counter (TEPC). The microdosimetric single event spectra for 0.5, 1, 2, 3 and 5 μm site sizes were obtained in the lineal energy range from 1 to 1000 keV/μm. Neutron and gamma-ray fractional doses were estimated from the single event spectra. The neutron dose fraction was varied from 35 to 55% for 0.5 to 5 μm site size. The averaged lineal energy, <i>y</i><sub><i>D</i></sub>, for each site size was likewise estimated and found to be dependent on the site size. The averaged lineal energy for neutron was slightly larger than that of the fission neutrons from <sup>252</sup>Cf, and the averaged lineal energy for gamma-ray had similar site-size-dependence of 25 keV gamma-rays and 250 kV X-rays. Relative biological effectiveness was found to be 4.1 ± 0.13 for UTR-KINKI using Tilikidis's 2 Gy-response function. The estimated RBE for UTR-KINKI neutrons is quite close to the previous biological experimental value of 4.3 ± 0.6 for micronucleated cells in gill cell of Medaka and 4.6 ± 0.5 for induction of lymphocyte apoptosis in the thymus of ICR mice.

Journal

  • Journal of Radiation Research

    Journal of Radiation Research 50(1), 83-87, 2009-01-16

    Journal of Radiation Research Editorial Committee

References:  15

Codes

  • NII Article ID (NAID)
    110007042072
  • NII NACSIS-CAT ID (NCID)
    AA00705792
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    04493060
  • NDL Article ID
    9776744
  • 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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