Home > Palladium
5 Isotopes
Naturally-occurring palladium is composed of six isotopes. The most stable radioisotopes are Pd-107 with a half-life of 6.5 million years, Pd-103 with a half-life of 17 days, and Pd-100 with a half-life of 3.63 days. Eighteen other radioisotopes have been characterized with atomic weights ranging from 92.936 u (Pd-93) to 119.924 u (Pd-120). Most of these have half-lifes that are less than a half an hour except Pd-101 (half-life: 8.47 hours), Pd-109 (half-life: 13.7 hours), and Pd-112 (half-life: 21 hours).
The primary decay mode before the most abundant stable isotope, Pd-106, is electron capture and the primary mode after is beta decay. The primary decay product before Pd-106 is rhodium and the primary product after is silver.
Radiogenic Ag-107 is a decay product of Pd-107 and was first discovered in the Santa Clara, California meteorite of 1978. The discoverers suggest that the coalescence and differentiation of iron-cored small planets may have occurred 10 million years after a nucleosynthetic event. Pd-107 versus Ag correlations observed in bodies, which have clearly been melted since accretion of the solar system, must reflect the presence of short-lived nuclides in the early solar system.
6 References
7 External links
Chemical elements
Metals
