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Etude et validation d'un spectromètre gamma pour la mesure de la composition chimique des surfaces planétaires. Application à une mission vers Mercure.

Abstract : This PhD thesis deals with the design of a gamma-ray spectrometer for the remote analysis of the chemical composition of planetary surfaces and was performed in the frame of a mission scenario to explore the planet Mercury. The research studies consisted first in characterizing the detection performances of a gamma-ray spectrometer using a high-purity germanium crystal cooled actively at cryogenic temperatures. Therafter the studies dealt with the critical issues addressed for the use of such a detector onboard a mission to the inner solar system. The radiation damage caused by solar protons in germanium crystals was investigated by experimental and numerical means. Finally, a numerical thermal model of the instrument as well as some tests on a thermal mockup were performed to validate the thermal design of the instrument.
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Submitted on : Thursday, March 15, 2007 - 10:24:57 AM
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Benoît Pirard. Etude et validation d'un spectromètre gamma pour la mesure de la composition chimique des surfaces planétaires. Application à une mission vers Mercure.. Physique [physics]. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00136703⟩

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