High energy X-γ ray spectrometer on the Chandrayaan-1 mission to the Moon

Goswami, J. N. ; Banerjee, D. ; Bhandari, N. ; Shanmugam, M. ; Acharya, Y. B. ; Subhedar, D. V. ; Sharma, M. R. ; Umapathy, C. N. ; Sreekumar, P. ; Sudhakar, M. ; Abraham, L. ; Agrawal, P C (2005) High energy X-γ ray spectrometer on the Chandrayaan-1 mission to the Moon Journal of Earth System Science, 114 (6). pp. 733-738. ISSN 0253-4126

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Official URL: http://www.ias.ac.in/jess/dec2005/ilc-19.pdf

Related URL: http://dx.doi.org/10.1007/BF02715958


The Chandrayaan-1 mission to the Moon scheduled for launch in late 2007 will include a high energy X-ray spectrometer (HEX) for detection of naturally occurring emissions from the lunar surface due to radioactive decay of the 238U and 232Th series nuclides in the energy region 20-250 keV. The primary science objective is to study the transport of volatiles on the lunar surface by detection of the 46.5 keV line from radioactive 210Pb, a decay product of the gaseous 222Rn, both of which are members of the 238U decay series. Mapping of U and Th concentration over the lunar surface, particularly in the polar and U-Th rich regions will also be attempted through detection of prominent lines from the U and Th decay series in the above energy range. The low signal strengths of these emissions require a detector with high sensitivity and good energy resolution. Pixelated Cadmium-Zinc-Telluride (CZT) array detectors having these characteristics will be used in this experiment. Here we describe the science considerations that led to this experiment, anticipated flux and background (lunar continuum), the choice of detectors, the proposed payload configuration and plans for its realization

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Chemical Composition; Volatile Transport; High Energy X-Rays; Chandrayaan-1; Thorium Distribution On Moon
ID Code:14662
Deposited On:12 Nov 2010 13:52
Last Modified:16 May 2016 23:38

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