An accurate dosimetry system using thermoluminescent detectors has been developed for monitoring radiation exposures to individual uranium miners. The system permits the evaluation of cumulative exposures to airborne radon progeny, expressed in units of Working Level Months, as well as the external gamma-ray exposure originating from the ore bodies. Thermoluminescent materials such as LiF, CaF2Dy and CaSO4: Mn have been evaluated as possible alpha-sensitive detectors of radon progeny collected on a filter paper. The most promising TLD utilizes CaF2:Dy, and is sufficiently sensitive to detect the accumulation of 105 MeV of latent alpha energy collected on a filter paper. Proper annealing of the CaF2: Dy crystal provides two response peaks, at 185°C and 265°C, for which fading is negligible for any proposed monitoring period.
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McCurdy et al. (1969) studied this question.