> When 13C is selected as a costrains, computed 13C values is almost same comparing with the observed value in radiocarbon calculation by using netpath, but calculated 14C values quite different from observed 14C respectively 6.34 and 0.33. Also examples 5, 6 and 7 in netpath manual, this case is present. I'm not sure what you mean. In example 5, the first model has computed C13 = -13.6, which is substantially different from -6.2. Niel goes on to try different models that are consistent between the computed and measured C13. > Do we have to take in to consideration only calculated and observed values of 13C? For a mole-balance model to be possible, it must have a computed C13 that is consistent with measured values. If the model is not consistent with the C13, it can not be correct. If it is consistent, it may or may not be the correct model. It is possible to have two models that account for C13, but give different C14 ages as seen in the second and fourth models of example 5. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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