The Chandrayaan-1 X-ray Spectrometer: First results

Weider, S. Z.; Kellett, B. J.; Swinyard, Bruce; Crawford, Ian; Joy, K. H.; Grandé, M.; Howe, C.; Huovelin, J.; Narendranath, S.; Alha, L.; Anand, M.; Athiray, P. S.; Bhandari, N.; Carter, J.A.; Cook, A. C.; d’Uston, L.; Fernandes, V. A.; Gasnault, O.; Goswami, J. N.; Gow, Jason; Holland, Andrew D.; Koschny, D.; Lawrence, D. J.; Maddison, B. J.; Maurice, S.; McKay, DJ; Okada, T.; Pieters, C. M.; Rothery, David A.; Russell, S. S.; Shrivastava, Anurag; Smith, David R.; Wieczorek, M. A.

doi:10.1016/j.pss.2011.08.014

Cited by 28 publications

(18 citation statements)

References 64 publications

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“…Weider et al . [] concluded that the LP‐derived Mg abundances are incorrect, primarily based on the strong agreement between the C1XS results and the corresponding A14 lunar sample compositions. However, a comparison of the Prettyman et al .…”

Section: Sensitivity Of High‐energy Gamma Rays To Elemental Compositionmentioning

confidence: 89%

“…Additional evidence that the HEGR‐derived abundance map is inadequate in some mare regions comes from regional measurements of Mg abundances from X‐ray spectroscopy measurements, including from the Apollo X‐Ray Spectrometer experiments (AXRS) [ Adler et al ., ] and the Chandrayaan‐1 X‐ray Spectrometer (C1XS) [ Weider et al ., ]. A preliminary examination of AXRS results from the northern portion of Mare Nubium (Mg/Si = 0.20 ± 0.05) and the southern portion of Mare Tranquilitatis (Mg/Si = 0.23 ± 0.05) do not agree with the corresponding values from HEGR‐derived Mg/Si abundances values (0.34 ± 0.04 and 0.41 ± 0.04; as calculated from the Mg abundance map of Figure a using a lunar average Si abundance value of 21 ± 2 wt%).…”

Section: Sensitivity Of High‐energy Gamma Rays To Elemental Compositionmentioning

confidence: 99%

“…Weider et al . [] note that the LP Mg abundances systematically overestimate Mg by ~5 wt%, and that the SiO 2 abundances tend to be lower than the corresponding Apollo soil compositions. They suggest that normalizing the LP Mg abundances instead to a global SiO 2 abundance can improve, but not eliminate, the discrepancies between the LP and C1XS Mg abundance ratios.…”

Section: Sensitivity Of High‐energy Gamma Rays To Elemental Compositionmentioning

confidence: 99%

“…[33] Additional evidence that the HEGR-derived abundance map is inadequate in some mare regions comes from regional measurements of Mg abundances from X-ray spectroscopy measurements, including from the Apollo X-Ray Spectrometer experiments (AXRS) [Adler et al, 1973] and the Chandrayaan-1 X-ray Spectrometer (C1XS) [Weider et al, 2012]. A preliminary examination of AXRS results from the [34] Since the HEGR-derived Mg abundances for these regions are generally higher than those of Prettyman et al [2006], the CIXS results also disagree with the HEGRderived Mg abundances.…”

Section: Mg Abundances Derived From High-energy Gamma Raysmentioning

confidence: 99%

“…A preliminary examination of AXRS results from the [34] Since the HEGR-derived Mg abundances for these regions are generally higher than those of Prettyman et al [2006], the CIXS results also disagree with the HEGRderived Mg abundances. Weider et al [2012] concluded that the LP-derived Mg abundances are incorrect, primarily based on the strong agreement between the C1XS results and the corresponding A14 lunar sample compositions. However, a comparison of the Prettyman et al [2006] Mg abundances at the SRB sample sites to the respective SRB Mg abundances (see Table 1) also yields a good correlation coefficient (0.73), bringing into question any conclusions based on a single sample site comparison.…”

Section: Mg Abundances Derived From High-energy Gamma Raysmentioning

confidence: 99%

See 4 more Smart Citations

New insights into the global composition of the lunar surface from high‐energy gamma rays measured by Lunar Prospector

Peplowski

Lawrence

2013

JGR Planets

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[1] An analysis of the lunar gamma-ray spectrum as measured by the Lunar Prospector Gamma-Ray Spectrometer has revealed that 8-8.9 MeV gamma rays contain information about the elemental composition of near-surface materials. These high-energy gamma rays are found to be primarily sensitive to the total Fe and Mg content of the surface, although other elements also contribute. This information has been used to identify several regions with unique compositions, including the Hertzsprung and Orientale basins. A method for deriving global Mg abundances from high-energy gamma-ray measurements is presented. The physical mechanism for high-energy gamma-ray production is proposed to be radiation produced during the decay of galactic cosmic ray produced pions within the lunar surface. Laboratory measurements of pion production cross sections are found to be consistent with the empirically derived relationship between the lunar Fe, Mg, and Ti abundances and the measured high-energy gamma-ray count rates.Citation: Peplowski, P. N., and D. J. Lawrence (2013), New insights into the global composition of the lunar surface from high-energy gamma rays measured by Lunar Prospector,

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Section: Sensitivity Of High‐energy Gamma Rays To Elemental Compositionmentioning

confidence: 89%

Section: Sensitivity Of High‐energy Gamma Rays To Elemental Compositionmentioning

confidence: 99%

Section: Sensitivity Of High‐energy Gamma Rays To Elemental Compositionmentioning

confidence: 99%

Section: Mg Abundances Derived From High-energy Gamma Raysmentioning

confidence: 99%