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Risk assessment after internal exposure to black sans from Camargue: uptake and prospective dose calculation


Congress title : 6th Workshop on Internal Dosimetry of Radionuclides 
Congress town : Montpellier
Congress date :02/10/2006
Journal title : Radiation Protection Dosimetry 127 issue 1-4 Pages : 64-67

Document type > *Congrès/colloque

Keywords >

Research Unit > IRSN/DRPH/SRBE/LRTOX

Authors > BLANCHARDON Eric, BOUISSET Patrick, CHAZEL Valérie, FRELON Sandrine, PAQUET François, POURCELOT Laurent, TOURLONIAS Elie

Publication Date > 01/11/2007

Summary

Some beaches in the south of France present high levels of natural radioactivity mainly due to thorium (Th) and uranium (U) present in the sand. Risk assessment after internal exposure of members of the public by either inhalation or ingestion of black sand of Camargue was performed. This evaluation required some information on the human bioavailability of U and Th from this sand. In vitro assays to determine the solubility of U, Th and their progeny were performed either in simulated lung fluid, with the inhalable fraction of sand, or in both simulated gastric and intestinal fluids with a sample of the whole sand. The experimental data show that the bioavailability of these radionuclides from Camargue sand is low in the conditions of the study. Prospective dose assessment for both routes of intake show low risk after internal exposure to this sand.

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