Abstract
Production cross-sections for tritium have been measured in cyclotron targets and have been quoted as 53, 62 and 130 millibarns. These are compared with values deduced from cosmic-ray bombardment of iron meteorites, where a direct tritium measurement leads to 280 mb, while He 3:He 4 ratio measurements lead to at least 215 mb, possible as high as 410 nib. Hence application of cyclotron cross-sections may lead to too high values for the cosmic-ray ages of meteorites.
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