Elemental analysis of a comet nucleus by passive gamma ray spectrometry from a penetrator

Details Elemental analysis of a comet nucleus by passive gamma ray spectrometry from a penetrator Elemental analysis of a comet nucleus by passive gamma ray spectrometry from a penetrator

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..525e&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Physics

5

Abundance, Chemical Analysis, Comet Nuclei, Comet Rendezvous Asteroid Flyby Mission, Cosmochemistry, Flyby Missions, Gamma Ray Spectrometers, Chondrites, Isotopes, Rendezvous Spacecraft, Solar System, Thermal Neutrons

Scientific paper

The Comet Rendezvous Asteroid Flyby (CRAF) spacecraft, to be launched in 1991, was designed to study the physical and chemical properties of cometary and asteroid bodies. It is proposed that these properties can be determined by utilizing a penetrator experiment delivery system aboard the CRAF, which would deliver a passive gamma ray spectrometer to the comet and determine the composition of subsurface materials. Results of calculations for a model comet (50 percent CI carbonaceous chrondrite, 50 percent ices) provide data on the expected gamma ray fluxes, the minimum detectable limits, and the detection uncertainties for 35 isotopes. These results confirm that this technique can determine the composition of both the rocky and ice components, and the rock-to-ice ratio in the nucleus. In addition, useful information regarding the formation of the solar system is provided.

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