Instrument Calibrations and Data Analysis Procedures for the NEAR X-Ray Spectrometer
Abstract: The X-Ray spectrometer onboard the Near Earth Asteroid Rendezvous spacecraft will measure X-rays from the surface of 433 Eros in the energy region 0.7–10 keV. Detection of characteristic Kα line emissions from Mg, Al, Si, Ca, Ti, and Fe will allow the determination of surface abundances of these geologically important elements. Spatial resolution as fine as 3 km will be possible for those elements where counting statistics are not a limiting factor. These measurements will make it possible to relate Eros to known classes of meteorites and reveal geological processes that occurred on Eros. The calibration measurements and analysis procedures presented here are necessary for the reduction and analysis of the X-ray data to be collected during one year of orbital operations at Eros.
Cites background from "Instrument Calibrations and Data An..."
...The XRS instrument owes much of its heritage to the X-ray/gamma-ray spectrometer (XGRS) instrument on the Near Earth Asteroid Rendezvous (NEAR) Shoemaker mission (Starr et al. 2000)....
Cites methods from "Instrument Calibrations and Data An..."
...A “balanced filter” approach (Starr et al., 2000) was therefore employed, in which thin foils of Mg and Al placed in front of two GPCs provide selective absorption at different energies and allow the fluorescent signals from these elements to be deconvolved (Adler et al., 1972; Trombka et al.,…...
"Instrument Calibrations and Data An..." refers background in this paper
...A detailed description of the response of proportional counters can be found in Knoll (1989). The gas proportional counters on NEAR have a chamber diameter of 42 mm and are filled with P-10 gas, a mixture of 90% argon and 10% methane, to an absolute pressure of 1200 mbar....
...A detailed description of the response of proportional counters can be found in Knoll (1989)....
...(See, for example, Knoll, 1989)....
"Instrument Calibrations and Data An..." refers background or methods in this paper
...LIBRATION 509 Detailed discussions of these processes can be found in Clark (1979), Trombka et al. (1979), Yin et al. (1993), and Clark and Trombka (1997)....
...Laboratory and field calibrations, in conjunction with theoretical calculations, are required in order to obtain photon-to-elemental composition conversion factors. eter data is described in Clark (1979) and Clark and Trombka (1997)....
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