 Some radioactive decay series

▪ TableSome radioactive decay serieselement radioactive isotope final product isotopic abundance (%) halflife (in 10^{9} years)uranium U235 Pb207 0.72 0.7U238 Pb206 99.28 4.5thorium Th232 Pb208 100.0 14.0potassium K40 (89%) Ca40 0.01 1.4*(11%) Argon40 11.9*rubidium Rb87 Sr87 27.8 48.8*halflife for K40 as a whole is 1.25(10^{9}) years.See as table:
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