Determination of uranium in urine by fluorometry

The method to measure natural uranium in urine used in the CIEMAT has been revised, evaluated, and documented. The procedure is based on a direct fluorometric determination in the ashed urine sample. Two factors wich could influence the results have been studied: Ca(II) amounts in the sample, and inorganic waste in fused pellet. The lower limit of detection has been determined from 'blank' urine samples and it has been found in agreement with 'ICRP' recommendations. The method has been shown to be quench independent, rapid, accurate and economical. (Author)