Abstract
The beta energy absorbed in the thermoluminescent (TL) phosphor was determined directly from the difference in the pulse height spectrum between incident and transmitted beta particles to and from the phosphor, in order to examine the sensitivity of commercially available powdered phosphors, LiF (TLD-100) and CaF2:Dy (TLD-200), to beta particles. A beta ray spectrometer equipped with plastic scintillator and GM tube was used, instead of an extrapolation chamber. The TL sensitivity of LiF powder to the beta particles emitted from sources of 45Ca, 204Tl, 90Sr/90Y, and 32P was found to be 0.18-0.22 Gy.µJ-1 per 5 mg of phosphor expressed in equivalent air kerma of 60Co gamma rays. The sensivity of CaF2:Dy powder to beta rays was approximately 8 times that of LiF. It is suggested that a beta dosemeter capable of estimating the beta energy or a two-element or multi-element dosemeter is necessary for measurement of beta dose in a deep skin.
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