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Synchrotron X-Ray irradiation of Stardust interstellar candidates: from ''no'' to ''low'' damage effects

Alexandre Simionovici 1 Carlton Allen 2 Sasa Bajt 3 Ron Bastien 2 H. A. Bechtel 4 Janet Borg 5 Frank Brenker 6 John C. Bridges 7 D.E. Brownlee 8 Mark J. Burchell 9 Manfred Burghammer 10 Anna L. Butterworth 11 P. Cloetens 10 Andy M. Davis 12 Christine Floss 13 George Flynn 14 David Frank 2 Zack Gainsforth 11 Eberhard Grün 15, 16 Philipp R. Heck 17 Jon K. Hillier 18 Peter Hoppe 19 L. Howard 20 Gary R. Huss 20 Joachim Huth 19 Anton T. Kearsley 21 A.J. King 12 Barry Lai 22 Jan Leitner 19 Laurence Lemelle 23 Hugues Leroux 24 Robert Lettieri 11 Will Marchant 11 Larry R. Nittler 25 Ryan Ogliore 26 Frank Postberg 15, 27 S. A. Sandford 28 Juan-Angel Sans Tresseras 10 Tom Schoonjans 29 Sylvia Schmitz 6 G. Silversmit 29 Vicente A. Solé 10 Ralf Srama 30 Thomas Stephan 12 Julien Stodolna 11 Rhonda M. Stroud 31 Steve Sutton 22 Mario Trieloff 27 Peter Tsou 32 Akira Tsuchiyama 33 Tolek Tyliczszak 4 Bart Vekemans 29 Laszlo Vincze 29 Andrew J. Westphal 11 Dan Zevin 11 Michael E. Zolensky 2
Abstract : Although synchrotron radiation X-Ray fluorescence (SR-XRF) is among the least destructive analysis methods applied to rare extraterrestrial grains, we have observed radiation damage effects following high flux synchrotron analyses. Track 30 of the IS collector of the Stardust mission , containing 2 candidates dubbed Orion and Sirius was analyzed at ESRF, France, on beamlines ID13 and ID22NI by nano-XRF/XRD scanning methods. Beam damage effects were noticed on both samples and a quantitative analysis of their irradiation history was established , allowing us to propose new experimental protocols as well as fluence limits, minimizing such effects in the future. The purpose of this study is to present these facts, analyze potential damage mechanisms and offer alternatives.
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Submitted on : Tuesday, April 17, 2012 - 8:46:18 AM
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Alexandre Simionovici, Carlton Allen, Sasa Bajt, Ron Bastien, H. A. Bechtel, et al.. Synchrotron X-Ray irradiation of Stardust interstellar candidates: from ''no'' to ''low'' damage effects. Meteoritics and Planetary Science, Wiley, 2011, 46 (Supplement s1), p.A213. ⟨10.1111/j.1945-5100.2011.01221.x⟩. ⟨insu-00681756⟩



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