Journal
RADIATION RESEARCH
Volume 195, Issue 2, Pages 211-217Publisher
RADIATION RESEARCH SOC
DOI: 10.1667/RR15528.2
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Funding
- Atomic Energy of Canada Limited's Federal Science and Technology Program
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The study investigated the characteristics of chromosome aberrations in lymphocytes exposed to low doses of Cf-252 spectrum neutrons, showing that even at low doses, chromosome aberration clustering can be observed. RBEM values for neutron-plus-photon and neutron-only dose components were found to be 15.0 +/- 2.2 and 25.7 +/- 3.8, respectively.
Cells exposed to fast neutrons often exhibit a non-Poisson distribution of chromosome aberrations due to the high ionization density of the secondary reaction products. However, it is unknown whether lymphocytes exposed to californium-252 (Cf-252) spectrum neutrons, of mean energy 2.1 MeV, demonstrate this same dispersion effect at low doses. Furthermore, there is no consensus regarding the relative biological effectiveness (RBE) of Cf-252 neutrons. Dicentric and ring chromosome formations were assessed in human peripheral blood lymphocytes irradiated at doses of 12-135 mGy. The number of aberrations observed were tested for adherence to a Poisson distribution and the maximum lowdose relative biological effectiveness (RBE.) was also assessed. When Cf-252-irradiated lymphocytes were examined along with previously published cesium-137 (Cs-253) data, RBEM values of 15.0 +/- 2.2 and 25.7 +/- 3.8 were found for the neutron-plus-photon and neutron-only dose components, respectively. Four of the five dose points were found to exhibit the expected, or close to the expected non-Poisson over-dispersion of aberrations. Thus, even at low doses of Cf-252 fast neutrons, when sufficient lymphocyte nuclei are scored, chromosome aberration clustering can be observed. (C) 2021 by Radiation Research Society
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