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Radiation Protection Dosimetry Advance Access originally published online on July 4, 2007
Radiation Protection Dosimetry 2007 127(1-4):64-67; doi:10.1093/rpd/ncm252
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

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

Sandrine Frelon1,*, Valérie Chazel1, Elie Tourlonias1, Eric Blanchardon2, Patrick Bouisset3, Laurent Pourcelot4 and François Paquet1

1 IRSN/ RPH/SRBE, LRTOX, BP 166, 26702 Pierrelatte Cedex, France
2 IRSN/DRPH/SDI, LEDI, BP 17, 92262 Fontenay Aux Roses Cedex, France
3 IRSN/DEI/STEME, LMRE, Bois des rames, 91400 Orsay, France
4 IRSN/DEI/SESURE, LERCM, BP3, 13 115 St Paul lez Durance Cedex, France

* Corresponding author: sandrine.frelon{at}irsn.fr

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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