Determination of Kerma Factors of A-150 Plastic and Carbon at Neutron Energies Between 45 and 66 MeV

Abstract

Kerma factors of carbon and A-150 tissue-equivalent plastic have been measured in nearly mono-energetic neutron beams at energies between 45 and 66 MeV. The kerma was measured with low pressure proportional counters (PC), the walls consisting either of graphite or A-150 plastic material, and the neutron beam fluence was measured with a proton recoil telescope. The kerma factor corrections were determined from time-of-flight measurements with NE213 scintillation detectors and PCs. At neutron energies of (44.5 ± 2.6) MeV and (66.0 ± 3.0) MeV, the kerma factors were (40.9 ± 4.1) pGy.cm2 and (49.5 ± 8.7) pGy.cm2 for carbon and (80.4 ± 6.3) pGy.cm2 and (80.1 ± 8.2) pGy.cm2 for A-150 plastic.