I-Xe dating: intercomparisons of neutron irradiations and reproducibility of the Bjurböle standard

Parameters for a number of neutron irradiations are examined and results intercompared for the Bjurböle meteorite; data for the 1967 Valecitos-1 irradiation are presented. Apparent I-Xe ‘formation’ ages are reproducible for three different samples of Bjurböle, suggesting isotopic homogeneity for initial iodine in the bulk material. The systematics of neutron capture in ¹³⁵Xe (produced from ²³⁵U neutron fission) are examined and verified in irradiated BCR-1.