Kerma Factor of Carbon for 14.1-MeV Neutrons

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Abstract
Using microdosimetric techniques, a direct measurement was made of the kerma factor of carbon for 14.1-MeV neutrons. Kerma was inferred from charged particle energy depositions measured with a small graphite-walled proportional counter. Measurements with an ionization chamber and a proportional counter, both constructed with A150 plastic walls, as well as induced 24Na activity from the 27Al(n,.alpha.) reaction, determined the neutron fluence. The resulting carbon kerma factor was 0.178 .+-. 0.11 .times. 10-8 cGy [centi Gray] .cntdot. cm-2 which is lower than published tabulations but in agreement with recent microscopic cross-section measurements.

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