[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7901
Development and Testing of a Thermoluminescent Dosemeter for Mixed
Neutron-Photon-Beta Radiation Fields
Abstract
A new four-element thermoluminescent (TL) dosemeter and dose
evaluation algorithm have been developed and tested to better
characterize personnel exposure in mixed neutron-photon-beta radiation
fields. The prototype dosemeter is based on a commercially available TL
card (with three LiF-7 chips and one LiF-6 chip) and modified
filtration elements. The new algorithm takes advantage of the high
temperature peak characteristics of the LiF-6 element to better quantify
the neutron dose component. The dosementer was tested in various
radiation fields, consisting of mixtures of two radiation types
typically used for dosemeter performance testing, as well as mixtures
of three radiation types to simulate possible exposure conditions. The
new dosemeter gave superior performance, based on the tolerance
levels, when using the new algorithm as compared to a conventional
algorithm that did not use the high temperature peak methodology. The
limitations and further improvements are discussed.
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