A Comparison of TLD and Film for Personnel Dosimetry

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Abstract
The film badge is today the most widely used personnel monitoring device for want of a more reliable and accurate system. Recent evaluations of the performance of the available commercial film badge services report a wide variation in both the accuracy and consistency of the reported exposures. The best accuracy that one can obtain for gamma and X-radiation appears to be −50 to +200 per cent. This paper reports the feasibility of using the thermoluminescence of single crystals of LiF (TLD-100) to measure exposure levels of gamma and X-radiation encountered in the personnel dosimetry range. LiF single crystals in lucite capsules were attached to film badge holders and given known test exposures from gamma and X-ray sources and mixtures of these radiations. The performance of the TLD system is compared with the measured values reported by the film badge suppliers. The overall accuracy of the TLD system is about ±30 per cent for gamma and X-ray energies above 25 keV effective.

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