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<identifier>oai:HAL:hal-01491281v1</identifier>
<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Determination of low-level Radium isotope activities in fresh waters by gamma spectrometry</title>
<creator>Porras, Arnold molina</creator>
<creator>CONDOMINES, Michel</creator>
<creator>Seidel, Jean luc</creator>
<contributor>Hydrosciences Montpellier (HSM) ; Institut de Recherche pour le Développement (IRD) - Université Montpellier 2 - Sciences et Techniques (UM2) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0969-8043</source>
<source>Applied Radiation and Isotopes</source>
<publisher>Elsevier</publisher>
<identifier>hal-01491281</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01491281</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01491281</source>
<source>Applied Radiation and Isotopes, Elsevier, 2017, 120, pp.119-125. 〈10.1016/j.apradiso.2016.12.010〉</source>
<identifier>DOI : 10.1016/j.apradiso.2016.12.010</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.apradiso.2016.12.010</relation>
<language>en</language>
<subject lang=en>Radium isotopes</subject>
<subject lang=en>Mn-fibers</subject>
<subject lang=en>Fresh-waters</subject>
<subject lang=en>Groundwaters</subject>
<subject lang=en>Gamma spectrometry</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>A new portable sampling system was developed to extract Radium isotopes from large volumes (up to 300 L) of fresh surface- and ground-waters of low Ra-activities (<5 mBq/L). Ra is quantitatively adsorbed on a small amount (6.5 g) of MnO2-coated acrylic fibers, which are then dried and burned at 600 °C in the laboratory. The resulting Mn-oxide powder (about 2 cm3 when compacted) is then analyzed through gamma-ray spectrometry which allows measurement of the whole Ra quartet (226Ra, 228Ra, 224Ra and 223Ra) in a single counting of a few days. The usual relative standard combined uncertainties (1σ) are 2–3% for 226Ra, 228Ra and 224Ra; and less than 10% for 223Ra. This method was applied to the analysis of Ra in karstic waters of the Lez aquifer, and surface- and ground-waters of the upper and middle Vidourle watershed (South of France). The analyzed waters have relatively low 226Ra activities (1–4 mBq/L) in both cases, regardless of the contrasted geology (Mesozoic limestone vs crystalline Variscan basement), but clearly distinct (228Ra/226Ra) ratios in agreement with the differences in Th/U ratios of the two drained areas. Short-lived Ra isotopes (224Ra and 223Ra) appear to be mainly influenced by near-surface desorption/recoil processes for most of the sampling sites.</description>
<date>2017-02</date>
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