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

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...

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Bibliographic Details
Main Authors: Lavielle, B., Gilabert, E., Thomas, B.
Other Authors: RAEN, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Format: Conference Object
Language:English
Published: HAL CCSD 2011
Subjects:
[CHIM.ANAL]Chemical Sciences/Analytical chemistry
ice core
Online Access:https://hal.in2p3.fr/in2p3-00663814
Description
Summary: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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