Some radioactive decay series
 Some radioactive decay series

Some radioactive decay series
element radioactive isotope final product isotopic abundance (%) halflife (in 10^{9} years)
uranium U235 Pb207 0.72 0.7
U238 Pb206 99.28 4.5
thorium Th232 Pb208 100.0 14.0
potassium 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:
* * *
Universalium.
2010.
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