Abstract
A methodology for calculating the total absorbed doses in samples irradiated in nuclear research reactors which enables one to ascertain the contribution by each of the radiation field components (i. e., thermal, epithermal and fast neutrons as well as gamma radiation) has recently been described. The epithermal neutron spectrum has thus far been considered to vary as the inverse of the neutron energy (1/E spectrum), which is only valid as a first approximation. The present work improves that methodology by considering the epithermal neutron spectrum as varying according to 1/E 1+α , where α is the parameter accounting for the deviation from the 1/E law. Average kerma factors are calculated for various elements and nuclides, for values of α between -0.1 and + 0.2, an interval which covers practically all the experimental conditions of interest. The dose rate due to epithermal neutrons is found to decrease as α increases, with the exception of samples containing, mainly, 6 Li, B, N and/or Cl.
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