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Year : 2011  |  Volume : 34  |  Issue : 1  |  Page : 44-46

Response of CR-39 based personnel neutron dosemeter in terms of directional dose equivalent, in free air and on phantom

Radiological Physics and Advisory Division, BARC, Mumbai, India

Correspondence Address:
Rupali R Pal
Radiological Physics and Advisory Division, BARC, Mumbai
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Source of Support: None, Conflict of Interest: None

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CR-39 is the most sensitive of nuclear track detectors for protons and is recommended as an effective neutron dosimeter because of it's low threshold energy of 100 keV neutrons. The fraction of protons that gives detectable tracks in CR-39 depends on the energy of the proton angle of incidence and etching conditions. As a consequence the registration efficiency of neutrons in the CR-39 plastics used for neutron personnel monitoring is strongly influenced by the direction of radiation incidence. This paper presents the relative response of CR-39 at varying neutron incident angles, for 241 Am-Be neutron source spectra in free air and on ISO phantom, in terms of operational quantities. It is observed that the angular dependence of CR-39 for irradiations in air and on phantom is essentially the same indicating that the phantom does not affect the directional response of CR-39.

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