Physics – Geophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36...44y&link_type=abstract
Earth and Planetary Science Letters, vol. 36, no. 1, Aug. 1977, p. 44-50.
Physics
Geophysics
10
Cosmic Rays, High Altitude Tests, Nuclear Transformations, Radiation Effects, Sodium 22, Sodium 24, Aluminum, Geophysics, Magnesium, Radioactive Isotopes, Rates (Per Time), Scintillation Counters
Scientific paper
Production by cosmic ray action of Na-22 and Na-24 from aluminum and magnesium samples exposed to altitudes of 4600, 3840 and 2070 m was studied, with the aim of investigating the presence of cosmogenic radionuclides in terrestrial rocks. Rates of production of the sodium isotopes were calculated using a three-step cascade model to account for the interaction of galactic cosmic rays and the metal samples. For Na-22 production from Al, rates of 2.4, 1.7 and 0.6 atoms per minute per kg were determined for the three altitudes; these values compared well with the experimentally measured rates of 2.3 plus or minus 0.5, 1.8 plus or minus 0.3 and 0.77 plus or minus 0.18 atoms per minute per kg. Production of radionuclides such as H-3, Be-10, Ar-39, Mn-53 and Fe-55 at various altitudes, atmospheric depths and geomagnetic latitudes is also discussed.
Guichard Francois
Reyss Jean Louis
Yokoyama Yfji
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