The production of noble gas isotopes by interactions of high-energy cosmic ray particles with rocks was first recognized half a century ago when Paneth et al. (1952) showed that the high 3He/4He ratios in iron meteorites must be due to cosmic ray interactions and provide information about their ages. Other investigations in the late 1950s and the 1960s revealed the presence of a whole spectrum of cosmic-ray-produced noble gases in meteorites, showing characteristic isotopic abundances deviating substantially from those of all other known noble gas reservoirs (e.g., Marti et al. 1966). Likewise, a number of radionuclides...

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