Analysis of gamma-ray continuum spectra to determine the chemical composition

Thakur, A. N.

doi:10.1007/bf02034461

Cited by 3 publications

(1 citation statement)

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“…These scattered gamma rays add to the continuum at lower energies in the spectrum and decrease the signalto-noise ratio for the discrete lines and are generally not useful for the quantitative analysis of Mars composition. In some special cases, however, this continuum can be used to study or confirm compositional variations among measured spectra (Thakur, 1997). The exponential attenuation coefficients for gamma rays range from about 0.125 cm 2 /g at 0.2 MeV to 0.063 cm 2 /g at 1.0 MeV to 0.024 cm 2 /g at 10 MeV.…”

Section: Transport Of Gamma Raysmentioning

confidence: 99%

The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite

Boynton¹,

Feldman²,

Митрофанов³

et al. 2004

2001 Mars Odyssey

141

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Abstract. The Mars Odyssey Gamma-Ray Spectrometer is a suite of three different instruments, a gamma subsystem (GS), a neutron spectrometer, and a high-energy neutron detector, working together to collect data that will permit the mapping of elemental concentrations on the surface of Mars. The instruments are complimentary in that the neutron instruments have greater sensitivity to low amounts of hydrogen, but their signals saturate as the hydrogen content gets high. The hydrogen signal in the GS, on the other hand, does not saturate at high hydrogen contents and is sensitive to small differences in hydrogen content even when hydrogen is very abundant. The hydrogen signal in the neutron instruments and the GS have a different dependence on depth, and thus by combining both data sets we can infer not only the amount of hydrogen, but constrain its distribution with depth. In addition to hydrogen, the GS determines the abundances of several other elements. The instruments, the basis of the technique, and the data processing requirements are described as are some expected applications of the data to scientific problems.

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Section: Transport Of Gamma Raysmentioning

confidence: 99%