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  • LUNAR AND PLANETARY EXPLORATION  (8)
  • 1975-1979  (8)
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Year
  • 1
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    Unknown
    Surface chemistry of selected lunar regions (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A completely new analysis has been carried out on the data from the Apollo 15 and 16 gamma ray spectrometer experiments. The components of the continuum background have been estimated. The elements Th, K, Fe and Mg give useful results; results for Ti are significant only for a few high Ti regions. Errors are given, and the results are checked by other methods. Concentrations are reported for about sixty lunar regions; the ground track has been subdivided in various ways. The borders of the maria seem well-defined chemically, while the distribution of KREEP is broad. This wide distribution requires emplacement of KREEP before the era of mare formation. Its high concentration in western mare soils seems to require major vertical mixing.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-X-71157 , X-682-76-149
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Predicted versus observed cosmic-ray-produced noble gases in lunar samples - Improved Kr production ratios (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: New sets of cross sections for the production of krypton isotopes from targets of Rb, Sr, Y, and Zr have been constructed primarily on the bases of experimental excitation functions for Kr production from Y. These cross sections were used to calculate galactic-cosmic-ray and solar-proton production rates for Kr isotopes in the moon. The paper reports spallation Kr data obtained from ilmenite separates of rocks 10017 and 10047. Production rates and isotopic ratios for cosmogenic Kr observed in ten well-documented lunar samples and in ilmenite separates and bulk samples from several lunar rocks with long but unknown irradiation histories were compared with predicted rates and ratios. The agreements were generally quite good.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: CONF-790381-2 , LA-UR-79-1582 , Lunar and Planetary Science Conference; Mar 19, 1979 - Mar 23, 1979; Houston, TX
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Computer-generated maps of lunar composition from gamma-ray data (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Processing of some of the gamma-ray data obtained by Apollo 15 and 16 has been accomplished by analyzing count rates in three energy bands. The count rate variations in the three energy bands are due in various degrees to thorium, uranium, potassium, iron and titanium. The mapping which results from the gamma-ray count rates has an effective resolution of about two degrees. Regions of high titanium content in certain maria, the low values of iron in a zone of the central equatorial highland and the relatively low value of iron near Archimedes are noted.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: CONF-770322-5 , LA-UR-77-1487 , Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Surface chemistry of selected lunar regions (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A completely new analysis has been carried out on the data from the Apollo 15 and 16 gamma ray spectrometer experiments. The components of the continuum background have been estimated. The elements Th, K, Fe and Mg give useful results; results for Ti are significant only for a few high Ti regions. Errors are given, and the results are checked by other methods. Concentrations are reported for about sixty lunar regions; the ground track has been subdivided in various ways. The borders of the maria seem well-defined chemically, while the distribution of KREEP is broad. This wide distribution requires emplacement of KREEP before the era of mare formation. Its high concentration in western mare soils seems to require major vertical mixing.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-X-74611 , LA-UR-76-972 , CONF-760323-4 , Lunar Sci. Conf. on Util. of Lunar Mater. and Expertise for Large Scale Operations in Space; Mar 15, 1976 - Mar 19, 1976; Houston, TX; United States
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  • 5
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    Planetary gamma-ray spectroscopy (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The measured intensities of certain gamma rays of specific energies escaping from a planetary surface can be used to determine the abundances of a number of elements. The fluxes of the more intense gamma ray lines emitted from 32 elements have been calculated using current nuclear data and existing models for the source processes. The fluxes emitted from a surface of average lunar composition are reported for 292 gamma ray lines. Detection sensitivities for various elements are examined and applications of gamma ray spectroscopy for future orbiters to Mars and other solar system objects are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
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    NASA TECHNICAL REPORTS
  • 6
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    Unknown
    Comparisons between observed and predicted cosmogenic noble gases in lunar samples (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Comparisons are made between cosmogenic production rates and isotopic ratios predicted on the basis of nuclear systematics with those observed in well-documented lunar samples. Although some significant differences are found, the agreement in general is surprisingly good. The predicted production rates for Ar-38 and Xe-126 agree reasonably well with observation but the predicted rate for Ne-21 appears to be too high; in most cases the predicted rate for Kr-83 agrees to within 50%, although some larger differences are apparent. There are some prominent cases in which predicted isotopic compositons differ from observation: Kr-78/Kr-83 trends in the wrong sense with the Zr/Sr ratio; Xe-124/Xe-126 is too large by about 13%; Xe-128/Xe-126 is too small by about 6%; Xe-130/Xe-126 is too low by 30-40%.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
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    NASA TECHNICAL REPORTS
  • 7
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    Unknown
    Surface chemistry of selected lunar regions (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A completely new analysis has been carried out on the data from the Apollo 15 and 16 gamma-ray spectrometer experiments. The components of the continuum background have been estimated. The elements Th, K, Fe, and Mg give useful results; for Ti are significant only for a few high-Ti regions. Errors are given, and the results are checked by other methods. Concentrations are reported for about 60 lunar regions; the ground track has been subdivided in various ways. The borders of the maria seem well-defined chemically, while the distribution of KREEP is broad. This wide distribution requires emplacement of KREEP before the era of mare formation. Its high concentration in western mare soils seems to require major vertical mixing.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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    NASA TECHNICAL REPORTS
  • 8
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    Unknown
    The reaction Mg/n, alpha/Ne at 14.1 and 14.7 MeV - Cross sections and implications for meteorites (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Mass spectroscopic analysis of neutron-irradiated targets of natural magnesium yields cross sections of 59 + or - 14, 160 + or - 8, and 11.0 + or - 3.3 mb for Ne-20, Ne-21 and Ne-22, respectively, at 14.1 MeV and of 94 + or - 8, 152 or - 12, and 13.0 + or - 2.0 mb at 14.7 Mev. Using these cross sections, calculations modeling cosmic ray interactions in stony meteoroids of radii 20 and 26 cm predict that between the surface and the center the Ne-22/Ne-21 ratio falls more than 10% while the Ne-21 production rate rises about 30%. Calculations are compared with published neon measurements for the Keyes and St. Severin meteorites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 44; 2, Au; Aug. 197
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