Determination of the four natural Ra isotopes in thermal waters by gamma-ray spectrometry |
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| Authors: | M Condomines S Rihs E Lloret JL Seidel |
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| Institution: | 1. Géosciences Montpellier, Université Montpellier 2 et CNRS, place Eugène Bataillon, 34095 Montpellier cedex 05, France;2. Laboratoire d’Hydrologie et Géochimie de Strasbourg, Université de Strasbourg et CNRS, 1 rue Blessig, 67084 Strasbourg cedex, France;3. HydroSciences Montpellier, Université Montpellier 2 et CNRS, place Eugène Bataillon, 34095 Montpellier cedex 05, France;1. Physics Department, McDaniel College, Westminster, MD 21157, USA;2. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Physics Department, McDaniel College, Westminster, MD 21157, USA;2. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;2. Physics Department, McDaniel College, Westminster, MD 21157, USA |
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| Abstract: | Our method for the simultaneous determination of the four natural Ra isotopes (226Ra, 228Ra, 224Ra and 223Ra) in thermal waters involves a separation of Ra on a selective filter (3 M EMPORE? Radium Rad disk), and a single counting using a broad-energy HPGe detector (BE Ge manufactured by CANBERRA?). The calculation of 223Ra and 228Ra activities requires interference and cascade summing corrections. The 226Ra activities in CO2-rich thermal waters of the Lodève Basin (South of France) range from 530 to 2240 mBq/l. The low (228Ra/226Ra) activity ratios (0.19–0.29) suggest that Ra is mostly derived from the aquifer carbonates. The short-lived 224Ra and 223Ra are probably added to the water through recoil or desorption processes from Th-enriched coatings on the fracture walls. |
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