par Raisbeck, Grant M.;Tran, Tuan Anh;Lunney, David;Gaillard, C.;Goriely, Stéphane ;Waelbroeck, Claire;Yiou, Françoise
Référence Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 259, 1, page (673-676)
Publication Publié, 2007-06
Article révisé par les pairs
Résumé : We describe here the chemical and AMS procedures that we have developed to look for 244Pu in marine sediments. This study was motivated by the report of Knie et al. [K. Knie, G. Korschinek, T. Faestermann, E.A. Dorfi, G. Rugel, A.Wallner, Phys. Rev. Lett. 93 (2004) 171103] for observation of 60Fe in a ferromanganese crust, which they have interpreted as resulting from the explosion of a supernova near the solar system ∼2.8 My ago. A novel aspect of the AMS procedure is the use of various Mo isotopes as "pilot" beams, which allow us to tune the machine for the various Pu isotopes, without the necessity of using enriched Pu standards, thus minimizing the risk of 244Pu contamination. These techniques have been tested on an IAEA marine sediment containing nuclear weapons contaminated 239Pu and then applied to an Indian Ocean sediment over the period 2.4-4.0 My. © 2007 Elsevier B.V. All rights reserved.