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A method for measuring low gamma-ray contamination in a fast neutron field is described by which a single detector is operated sequentially as an ionization chamber and as a proportional counter. The range of collecting voltage for which the apparent gas multiplication is independent of particle type or mode of operation was determined. The method attains high accuracy in the measurement of the ratio of neutron to total dose and has been applied to several neutron sources.
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Slater et al. (1958) studied this question.
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