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  • SPACE SCIENCES  (6)
  • 1985-1989
  • 1970-1974  (6)
Collection
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  • 1985-1989
  • 1970-1974  (6)
Year
  • 1
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    Rare gases from stepwise heating of lunar rock 12013 (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: He, Ne, Ar and Xe from stepwise heating of Apollo 12 lunar rock 12013, discussing radiogenic and spallation components and He 3 and Ne 21 cosmic ray exposure ages
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Argon-40-argon-39 dating of Apollo sample 15555. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An age of 3.33 (plus or minus 0.05) b.y. was obtained for Apollo 15 sample 15555 by argon-40-argon-39 dating. The age of rock 15555, a basalt from the rim of Hadley Rille, establishes an upper limit to the age of the rille. The basalt flows filling the Hadley Rille section of the Imbrium basin postdate the formation of the basin - as measured by the Apollo 14 samples of the Fra Mauro formation - by at least 500 m.y. Therefore, the mare basalts cannot be simple impact melts but rather must result from some igneous activity on the moon.
    Keywords: SPACE SCIENCES
    Type: Science; 175; Jan. 28
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Studies of K-Ar dating and xenon from extinct radioactivities in breccia 14318; implications for early lunar history (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The lunar breccia 14318 is one of three Apollo-14 breccias containing substantial amounts of parentless xenon from the spontaneous fission of extinct Pu-244. The argon and xenon contained in this breccia were studied by stepwise heating of pristine and neutron-irradiated samples. The isotopic composition of xenon from fission, determined by an improved method, is shown to be from Pu-244. Concentrations of this fissiogenic xenon are in substantial excess (15-fold) of what could be produced by spontaneous fission of U-238. The breccia is found to contain abundant trapped argon with an Ar-40/Ar-36 ratio of roughly 14. Otherwise, the argon is radiogenic and gives a convincing K-Ar age of 3.69 plus or minus 0.09 b.y. by the stepwise Ar-40/Ar-39 method, nearly in agreement with ages for other Apollo-14 breccias.
    Keywords: SPACE SCIENCES
    Type: Geochimica et Cosmochimica Acta; 38; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Rare-gas analyses on neutron irradiated Apollo 12 samples. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Argon, krypton, and xenon from stepwise heating of five Apollo 12 rocks that had been irradiated to a neutron fluence of about 10 to the 19th neutrons/sq cm were analyzed mass-spectrometrically. The Ar40-Ar39 ages were determined and range from 3.18 plus or minus 0.06 x 10 to the 9th years to 3.32 plus or minus 0.06 x 10 to the 9th years. Trace elements Ba, Br, I, and U were measured via the neutron-induced reactions that produce isotopes of krypton and xenon. The following concentration ranges were observed: Ba, 46 to 70 ppm; Br, 48 to 146 ppb; I, 16 to 73 ppb; and U, 170 to 247 ppb.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
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    NASA TECHNICAL REPORTS
  • 5
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    Isotopic studies in returned lunar samples (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Analysis of lunar soil samples returned by Apollo 11 and 12 flights are discussed. Isotopic studies of the rare gases from Apollo 11 flight lunar samples are presented. The lunar soil analyses indicated the following: (1) high concentrations of solar wind rare gases, (2) isotopic match between solar wind gases and gas components in gas-rich meteorites, and (3) rare gases attributable to spallation reactions induced in heavier nuclides by cosmic ray particles.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-115305
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Spallogenic Ne, Kr, and Xe from a depth study of 12002 (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Isotopic abundances and concentrations of spallogenic Ne, Kr and Xe in Apollo 12 rock 12002, constructing three stage model of irradiation history
    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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