C-14/C-12  search
BTisotopes
 .radioactive isotopes
 ..C-14/C-12
BTisotopes
 .stable isotopes
 ..C-14/C-12
BTcarbon
 .C-14/C-12
RTC-14
 isotope ratios
 C-12
SNAs of 1993, not to be used for absolute age. This term has multiple hierarchies.