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Development of a new facility for dating old ground waters and ice cores using 81Kr.

B. Lavielle 1 E. Gilabert 1 B. Thomas 1
1 RAEN
CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
Abstract : Krypton-81 is produced by nuclear reactions induced by cosmic rays in atmosphere while Krypton-85 is released from nuclear installations. With respective halflifes of 229 ky and 10.76 y, these isotopes are considered as ideal tracers for dating groundwater or ice core [1-6]. The measurement of 81Kr from a groundwater sample was first demonstrated using several isotopic enrichment steps followed by RISTOF technique [1-3]. Due to the very low abundance of 81Kr in groundwater - 1200 atoms/l in modern water - the dating generally requires sample volumes of at least several hundred liters [5,7]. Since 2003, in a collaborative work with IRIM, CNAB is developing a set of four instruments in order to measure 81Kr in groundwater using reasonable volume of water (20 l). Each instrument is dedicated to perform important steps in the dating process:
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Submitted on : Tuesday, February 14, 2012 - 2:23:17 PM
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B. Lavielle, E. Gilabert, B. Thomas. Development of a new facility for dating old ground waters and ice cores using 81Kr.. Developments in Noble Gas Understanding And Expertise, 2011, Paris, France. ⟨in2p3-00663814⟩

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