Abstract
ABSTRACT The response of CR-39 plastic to monoenergetic neutrons when irradiated behind several different radiators has been studied using conventional pre-etching, followed by electrochemical etching, to reveal tracks as enlarged spots. The effects of varying the electrochemical-etching voltage and pre-etching time were also investigated. It was found that to produce a low-energy neutron response the electrochemical-etching voltage (at 5 kHz) must be greater than about 30 kV cm−1 (r.m.s.). A short pre-etching time was found to give the lowest background. The influence of the radiators can be qualitatively understood in terms of contributions from elastic H(n,n)p collisions and (n,p) and (n,α) reactions in the radiator materials.
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