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Thermoluminescent detectors (TLDs) can provide accurate and precise measurements for both patient and personnel dosimetry in the medical imaging environment. They have the advantages of tissue equivalency, an excellent dynamic range, and dose rate independence. In the work reported here, experiments with planar x-ray, fluoroscopy, and a 57Co source were conducted to test the repeatability and energy dependence of an LiF TL ribbon/automatic reader system and a four-element CaSO2 and Li2B4O7 badge/automatic reader system for diagnostic radiology and nuclear medicine dosimetry. The results indicate the usefulness and appropriateness of the TLD systems tested for both personnel and patient dosimetry in the medical diagnostic environment.

Millions of tonnes of slightly radioactive, scrap iron and steel, stainless steel, and copper are likely to become available as nuclear and other facilities and equipment are withdrawn from service. Disposition of this material is an international policy issue under consideration currently. The major alternatives for managing this material are to either develop a regulatory process for decontamination and recycling that will safeguard human health or to hspose of the scrap and replace the metal stccks. To evaluate the alternatives, we estimate quantities of scrap arising from nuclear power plant decommissioning, evaluate potential price impacts of recycling on regional markets, and assess the health and environmental impacts of the management alternatives. We conclude that decontaminating and recycling the scrap is the superior alternative.'

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