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Dose reconstruction of a Brazilian industrial gamma radiography partial-body overexposure case

In May 2000, an operator of a 60Co industrial gamma radiography apparatus, during a routine service, was involved in a partial-body radiological accident, which caused serious injuries to his left hand. Dose reconstruction was started aiming to assess the radiation doses, in order to assist the medical staff in the evaluation and prescription of suitable medical procedures for the patient’s treatment and follow-up. This work presents the dose reconstruction used for assessment of the distribution of doses on the patient’s left hand, which was made using two methods: physical and computational techniques. For the first technique a physical hand simulator was built. The computational method was performed using microcomputer software for external dose calculations, named ‘Visual Monte-Carlo—VMC’, together with a hand voxel simulator. The values obtained through both methods for the distribution of absorbed doses on the operator’s left hand were compared. About half of them were similar within a range of uncertainty of 20%.