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  • 1
    Electronic Resource
    Electronic Resource
    How old is the Cambrian System? (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 769-770 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has been known for a long time that loss of radiogenic argon can occur to a variable extent in some minerals which show no apparent alteration, notably potassium felspar. Thus Prof. Davidson's interpretation of the Russian argon/potassium age values is not-justified. This variable loss is often ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183769a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Geological Time-Scale (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 212-214 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE sequence of geological events in many parts of the world since the pre-Cambrian has been well established by palseontological studies. The relative duration of each of the various periods into which it is customary to divide post-Cambrian time has also been estimated from a comparison of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183212a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Production by Cosmic Rays of Helium-3 in Meteorites (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 200-201 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These results were considered as proving the cosmic ray origin, in the meteorites richest in helium, of the helrum-3 and most of the helium-4 ; but various questions concerning the mechanism of the helium formation by cosmic rays and the relative amounts of the two helium isotopes thus created ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172200a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cosmic Radiation Effects in Meteorites (1955)
    [s.l.] : Nature Publishing Group
    Nature 176 (1955), S. 733-734 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] RECENT studies of meteorites1 showed that they contain an appreciable amount of helium-3 produced by cosmic rays. The interactions of high-energy cosmic-ray particles with the meteoritic matter will produce effects which are propagated to great depths by secondary particles as well as primaries. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/176733a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The Ages and Origin of Meteorites (1955)
    [s.l.] : Nature Publishing Group
    Nature 176 (1955), S. 186-188 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE geological ages of meteorites have been discussed recently by several authors1"3. Paneth's classical helium method based on analyses for helium, uranium and thorium, now taking into account the helium generated also by cosmic rays4'5, is being supplemented by the argon-potassium method6"8. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/176186a0
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  • 6
    Electronic Resource
    Electronic Resource
    Cosmic-Ray Production of Helium in Meteorites and their Ages (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 1168-1169 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has recently been proved that a major part of the helium found in iron meteorites is due to the influence of cosmic rays1. This interaction should produce helium-3, helium-4 and tritium (see, for example, ref. 2), and the tritium will have decayed in geological time to helium-3. Helium-3 has ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1721168a0
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    Paper (German National Licenses)
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