AbstracCA composite thermoluminescent dosimeter (TLD), composed of four, thin TL elements with a high-speed reader, has been developed by employing an optical-heating method. Each TL element, which is 15mg/cm2 thick with a 3 m m dia., is prepared by applying Li2B407:Cu or CaS04:Tm to a plastic substrate 14 mg/cm2 thick. Each element can be heated to 350°C within 0.8sec. by IR radiation from a tungsten lamp. The characteristics of this TLD system include the following: (1) the detection limit of the Li2B407:Cu is 3 mR and the limit for CaS04:Tm is 0.1 mR; (2) the energy-dependence curves are similar to the doseequivalent curve, showing slight under-responses by 15% near 70 keV for Li2B407:Cu, and over-responses by 50% at high energies for CaS04:Tm; (3) despite quick heating, the residual dose is as low as 0.1% of the last exposure signal; (4) responses are very stable for more than 1 ,OOO cycles of repeated exposure readings; (5) no false signal could be detected, even in the cases of sweat or soil contamination; (6) the thin Li2B,07:Cu element can be used for skin dose monitoring; and (7) the processing time of the automatic reader for the composite dosimeter is 3 hr/SOO dosimeters. This TLD system can be applied to personnel dosimetry, gate monitoring and environmental monitoring.

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