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  • SPACE SCIENCES  (16)
  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • 1
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    Evidence for solar flare rare gases in the Khor Temiki aubrite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It has been found by studying a number of gas-rich meteorites, including Khor Temiki that there is a correlation between the abundance of 'track-rich' grains and the concentration of trapped rare gases. The amount of solar flare gas in Khor Temiki is examined. It is pointed out that the Khor Temiki enstatite is an ideal sample in which to look for evidence of solar flare gases because there has been little or no diffusion loss of solar wind gases.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 244; Aug. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Fossil particle tracks and uranium distributions in minerals of the vaca muerta meteorite. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-24
    Description: Radiochemical measurements of fossil charged particle tracks and uranium distribution in Vaca Muerta meteorite
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 3
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    Energy straggling eliminated as a limitation to charge resolution of transmission detectors (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is pointed out that detectors of the energy loss of penetrating charged particles are widely used for particle identification. These measurements are hampered, however, by fluctuations in the amount of energy deposited within the detector. It is shown that this limitation can be overcome with a new nuclear track detector, CR-39(DOP), and that the charge resolution of this detector exceeds that of any other, including semiconductor diodes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nature; 293; Oct. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Plutonium-244 fission tracks - Evidence in a lunar rock 3.95 billion years old. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Tracks attributed to the spontaneous fission of plutonium-244 and of uranium-238 were detected in a large whitlockite crystal in the lunar breccia 14321 from the Fra Mauro formation. For a track-retention age of 3.95 b.y., the number of plutonium tracks relative to the number of uranium tracks is 0.51 plus or minus 0.15, provided that the rock was not heavily neutron-irradiated 3.95 b.y. ago.
    Keywords: SPACE SCIENCES
    Type: Science; 176; May 26
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    NASA TECHNICAL REPORTS
  • 5
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    Extreme radiation damage in soil from Mare Fecunditatis. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-voltage electron microscopy has been used to compare radiation effects in micron-size soil grains from the Luna 16 site (Mare Fecunditatis) and the four Apollo landing sites. Radiation damage by heavy solar particles is strikingly greater in the Luna 16 sample than in the other four samples. It is suggested that less movement of the soil at Mare Fecunditatis has taken place, perhaps because of its proximity to the limb and consequent lower exposure to energetic electrons in the earth's magnetospheric tail, which would cause electrostatic agitation of fine particles.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 13; Jan. 197
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    NASA TECHNICAL REPORTS
  • 6
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    Gas-rich meteorites - Possible evidence for origin on a regolith (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The asymmetry of irradiation features of grains in the Kapoeta and Fayetteville meteorites suggests irradiation on a regolith before meteorite formation. Chondrules and broken grains require approximately 10,000 years of irradiation time between formation or fracturing and compaction into the meteorite. Shock erasure of tracks from irradiated Kapoeta feldspars requires a severe shock event during or after meteorite formation.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Jan. 11
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    NASA TECHNICAL REPORTS
  • 7
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    Nuclear tracks in lunar samples (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An attempt is made to relate the appearance of an etched tract to the atomic number and velocity of the ion that left it using 10 MeV/nucleon Kr beams and 6 MeV/nucleon Zn beams. It was found that the etching rate along a tract in minerals and glass is a monototonic function of ionization rate thus, making particle identification possible. Results show the following were present in lunar samples: superheavy elements, cosmic rays with z greater than 26, and solar flare particles in Surveyor glass.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-115266
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Ages of Darwin glass, Macedon glass, and Far Eastern tektites. (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Darwin and Macedon impact glasses related to Far Eastern tektites through age determination by fission track technique
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES|CORNING GLASS WORKS AND SMITHSONIAN INSTITUTION, INTERNATIONAL TEKTITE SYMPOSIUM; Apr 16, 1969 - Apr 18, 1969; CORNING, NY
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    NASA TECHNICAL REPORTS
  • 9
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    Sonic spark chambers for cosmic-ray experiments (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The sonic spark chamber provides an attractive high resolution hodoscope for low flux cosmic ray experiments. Spark position is determined by measurement of the time of flight of the sonic shock front from the spark position to a number of piezoelectric transducers placed at the periphery of the chamber. For each spark, four quantities must be determined: the spark coordinates, the sound velocity, and the spark 'size'. By over-determining the four parameters, high accuracy is possible. With eight sonic transducers, air-gap spark positions were measured with an error of less than 100 microns everywhere over a 1 sq m region.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
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    NASA TECHNICAL REPORTS
  • 10
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    Extralunar dust in Apollo cores (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Nuclear tracks high density in Apollo core small silicate crystals, discussing extralunar dust and photospheric iron-hydrogen ratio
    Keywords: SPACE SCIENCES
    Type: ; 63 (
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