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  • 1
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    Co-60 in lunar samples. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results obtained for Co-60 in lunar soils and rocks of different depths are discussed. These results are compared to a production calculation based on the work of Lingenfelter et al. (1972). The measurement of Co-60 activities can give information about the present-day equilibrium neutron flux in the lunar regolith. The most important quantity which can be derived from these data is the absolute present-day lunar neutron production rate.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 19; 3, Ju; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Depth profile of Mn-53 in the lunar surface (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of cosmic-ray produced Mn-53 are reported for a series of lunar surface samples down to a depth of 416 g/sq cm. These results clearly illustrate the decrease in activity with depth as the incident galactic cosmic rays are absorbed. Below 60 g/sq cm the production rate decreases exponentially with a mean length of about 220 g/sq cm. These results indicate that, at the Apollo 15 site, the lunar regolith has been unmixed, on a meter scale, for the last 5 m.y. The neutron activation technique for Mn-53, which allowed samples smaller than 200 mg to be used for these measurements, is described.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 20; 1, Se; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Cosmogenic nuclides in football-sized rocks. (1972)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The activity of long- and short-lived isotopes in a series of samples from a vertical column through the center of rock 14321 was measured. Rock 14321 is a 9 kg fragmental rock whose orientation was photographically documented on the lunar surface. Also investigated was a sample from the lower portion of rock 14310, where, in order to study target effects, two different density fractions (mineral separates) were analyzed. A few nuclides in a sample from the comprehensive fines 14259 were measured. This material has been collected largely from the top centimeter of the lunar soil. The study of the deep samples of 14321 and 14310 provided values for the activity of isotopes at points where only effects produced by galactic cosmic rays are significant.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Depth variation of cosmogenic nuclides in a lunar surface rock and lunar soil (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Depth profiles of cosmogenic radionuclides in lunar rocks and soil samples from Apollo 11 and 12 flights, considering solar particle flux and spectra
    Keywords: SPACE SCIENCES
    Type: LUNAR SCIENCE CONFERENCE; Jan 11, 1971 - Jan 14, 1971; HOUSTON, TX
    Format: text
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    NASA TECHNICAL REPORTS
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