Kerma factors far carbon and A-150 tissue equivalent plastic were determined in two nearly manoenergetic neutron beams. Kerma was measured with law pressure proportional counters (KS) with walls made of graphite and A-I50 plastic. The neutron Auence was measured with a proton recoil telescope. The CorrectionS for the kerma contributions from law energy neutrons in the beams were determined by time-of-flight measurements with an NE213 scintillation detector and with the KS. For neutron energies of (26.3+2.9) MeV and (37.8+2.5) MeV the kerma factors for carbon were (35.5+ 3.0) pGycm' and (42.6zt3.9) pGy cm', respectively, and for A-150 they were (75.6+ 5.4) pGy cm2 and (79.0+5.6) pGy cm2. At these energies the kerma factor ratio far ICRU muscle tissue to A-I50 calculated an the basis of the new kerma factors, is 0.93.
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