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Tissue equivalent proportional counters are frequently used to
measure dose and dose equivalent in mixed radiation fields that
include neutrons; however, detectors simulating sites 1um in
diameter underestimate the quality factor, Q, for low energy
neutrons because the recoil protons do not cross the detectors.
Proportional counters simulating different site-sizes can be used
to get a better neutron dose equivalent measurement since the range
and stopping power of protons generated by neutrons in the
tissue-equivalent walls depend on the energy of the primary
neutrons. The differences in the spectra measured by different size
detectors will provide additional information on the incident
neutron energy.
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