Abstract
Integral determinations of fast neutron kerma factors with low pressure proportional counters usually assume that either neutron interactions with the counting gas do not significantly contribute to the total energy deposited by charged particles in the gas or else that the wall and gas kerma are identical. This condition can be achieved for hydrogenous or graphite walled instruments. For elements with small kerma factors such as Mg, Al, Si, or Fe where the wall and gas kerma are not similar, direct neutron interactions with the gas may contribute a significant fraction of the gas dose. This effect was investigated by bombarding propane-based and argon-carbon dioxide filled Mg and Fe walled 1.27 cm diameter spherical proportional counters at several pressures with 14.8 MeV neutrons. The gas contribution does not affect the results for Mg, but changes the energy deposition spectrum for Fe and must be taken into account in determining the kerma factor.
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