Short-lived Nuclides Trapped in Meteorites

The discovery of radiogenic 129 Xe in the Richardton meteorite
began a chain of findings of other SN-produced radioactivities

*Boulos found these in the Earth <>
*Alexander and Bennett showed that iron meteorites formed early and trapped as much I-129 as chondrites [Earth Planet. Sci. Lett. 2 (1967) 220-224; ibid. 3 (1967) 95-100]