U-238/Pb-204  search
BTisotopes
 .radioactive isotopes
 ..U-238/Pb-204
BTmetals
 .lead
 ..U-238/Pb-204
BTmetals
 .actinides
 ..uranium
 ...U-238/Pb-204
RTHIMU
 Pb-204
 U-238
SNFor isotopic ratio used in age determination, use U/Pb. This term has multiple hierarchies.