Abstract
Radiochemical procedures for assay of Pa 233 following neutron activation of Th 232 in stone meteorites are described in detail. Eight analyses of five chondrites yielded an average concentration of (3.96 ± 0.20) × 10 −8 g Th/g which, with proper assumptions, leads to a cosmic atomic abundance of 0.026 for thorium (per 10 6 Si atoms). The thorium concentrations in two achondrites were found to differ by nearly two orders of magnitude. On comparison with uranium concentrations in stones determined by neutron activation analysis, the Th/U ratio in chondrites and achondrites agrees to nearly 5 per cent, yielding an average weight ratio of about 3.6.
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