Atomic Weights and Isotopic Compositions for Carbon
Isotope
Relative
Atomic Mass
Isotopic
Composition
Standard
Atomic Weight
Notes
6
C
12
12.0000000(00)
0.9893(8)
[12.0096, 12.0116]
13
13.003 354 835 07(23)
0.0107(8)
14
14.003 241 9884(40)