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Extraterrestrial materials examined by mean of nuclear microprobe
Khodja H., Smith T., Engrand C., Herzog G., Raepsaet C.
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms article in press (2012) - http://hal.in2p3.fr/in2p3-00752444
Physique/Astrophysique/Planétologie et astrophysique de la terre
Planète et Univers/Astrophysique/Planétologie et astrophysique de la terre
Extraterrestrial materials examined by mean of nuclear microprobe
H. Khodja1, 2, T. Smith1, 2, C. Engrand3, G. Herzog, C. Raepsaet1, 2
1 :  IRAMIS - Institut Rayonnement Matière de Saclay (ex DRECAM)
http://www-drecam.cea.fr/
CEA : DSM/IRAMIS
91191 Gif-sur-Yvette, France
France
2 :  LEEL - UMR 3299 - Laboratoire d'Etudes des Eléments Légers
http://iramis.cea.fr/sis2m/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=306
CNRS : UMR3299 – CEA : DSM/IRAMIS
LEEL, DSM/IRAMIS, CEA Saclay, 91191 Gif sur Yvette
France
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
CSNSM AS
Comet fragments, micrometeorites, and Interplanetary Dust Particles (IDPs) are small objects (<1 mm) of high scientific interest in cosmochemistry. More particularly, the determination of light element concentrations, such as C and N, in cometary samples is of interest since it gives information on the regions where such materials formed. Analyses of such objects should be performed so as to extract as much information as possible while preserving sample integrity. For this purpose, we need instruments and methods that provide both microanalysis and detailed imaging. In these respects, the nuclear microprobe offers many potential advantages: (i) the spatial resolution, ∼ 1μm is well-matched to the typical object dimensions, (ii) with some reservations, it is non-destructive when carefully conducted, (iii) it is quantitative, and especially sensitive for light elements. At the Saclay nuclear microprobe, we have been performing analyses of extraterrestrial objects for many years. We review some of these studies, emphasizing the specific requirements for successful analyses. We also discuss the potential pitfalls that may be encountered.

Articles dans des revues avec comité de lecture
2012
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms (Nucl. Instr. & Meth. Phys. B)
Publisher Elsevier
ISSN 0168-583X 
article in press

CSNSM AS