Assertion: osmium's isotope | /r/CreatedBy | decay processes
Facets:
value: in both uranium
type: LOCATION
value: in thorium
type: LOCATION
Source sentences:
text: Given the number of stable isotopes of lead and the fact that radiogenic isotopes of lead are produced by decay processes in both uranium and thorium, it is easy to understand how this method would result in large uncertainties in geological age estimates.