Author(s): Condomines M, Rihs S, Lloret E, Seidel JL, Condomines M, Rihs S, Lloret E, Seidel JL, Condomines M, Rihs S, Lloret E, Seidel JL, Condomines M, Rihs S, Lloret E, Seidel JL
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Abstract Our method for the simultaneous determination of the four natural Ra isotopes ((226)Ra, (228)Ra, (224)Ra and (223)Ra) in thermal waters involves a separation of Ra on a selective filter (3M EMPORE Radium Rad disk), and a single counting using a broad-energy HPGe detector (BE Ge manufactured by CANBERRA). The calculation of (223)Ra and (228)Ra activities requires interference and cascade summing corrections. The (226)Ra activities in CO(2)-rich thermal waters of the Lodève Basin (South of France) range from 530 to 2240mBq/l. The low ((228)Ra/(226)Ra) activity ratios (0.19-0.29) suggest that Ra is mostly derived from the aquifer carbonates. The short-lived (224)Ra and (223)Ra are probably added to the water through recoil or desorption processes from Th-enriched coatings on the fracture walls. Copyright (c) 2009 Elsevier Ltd. All rights reserved.
This article was published in Appl Radiat Isot
and referenced in Hydrology: Current Research