Proton-recoil Neutron Dosimeter for Personnel Monitoring

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Abstract
A personnel neutron dosimeter based on a CR-39 plastic tract detector registering recoil protons was developed. The sensitivity, energy response, angular dependence and fading characteristics were measured. The sensitivity to AmBe neutrons is 22.7 tracks cm-2 mrem-1. The energy response was investigated both experimentally and theoretically. Neutrons having energies as low as 144 keV can be detected. The energy response curve (tracks cm-2 mrem-1) is uniform to within 30% between 0.2-20 MeV. At energies outside this interval, considerably larger departures from uniformity exist. The in-air sensitivity decreases as the neutron direction changes from perpendicular to glancing incidence. The sensitivity at glancing incidence is less than 5% of that at perpendicular incidence. Fading studies show that the dosimeter is stable at room temperature over periods of months. Background distribution studies show that the lower limit of detection is .apprx. 10 mrem for a spectrum of AmBe neutrons.

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