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Method of Technecium 99 determination in urine through liquid scintillation. Technetiuh 99 is a long-life fission product; when enriched uranium is burnt, its amount is rather small but cannot be overlooked. Studies about reprocessing of this waste are being carried out by the CEA. They will lead to possible exposure to 99Tc of research workers. So it seems necessary to develop a close radiotoxicological watch suited to the situation. The proposed method enables an early detection of 99Tc in urine through liquid scintillation, owing to the fact that 10% of the contamination by inhalation is found in the 48 first hours urine after intake. This method is quick (60 min) and rather sensitive (detection is possible from 0.06 Bq ml-', that corresponds to an incorporation of 8.4 x 10-5 LAI or 1.7 x 103 Bq of qc).

Méthode de dosage du technétium 99 dans les urines par scintillation liquide