Determination of kerma factors of A-150 plastic and carbon at neutron energies between 45 and 66 MeV

Kerma factors of carbon and A-150 tissue-equivalent plastic have been measured in nearly monoenergetic 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. (author)