One of these assumptions is that nuclear decay rates have always been constant.
Although C decays fairly quickly, heavier isotopes (such as uranium-238) decay much more slowly.
Are these high radiocarbon “ages” a problem for the biblical worldview? First, remember that no detectable should be present within these samples if they really are millions of years old.
Despite this apparent difficulty for the recent-creation view, this is, in fact, a much more serious problem for the old-earth view!
Creation scientists have estimated (based upon the amounts of organic matter thought to be contained within the sedimentary layers) that the carbon in the pre-Flood biosphere may have been 300 to 700 times greater than what is present in today’s world.
C/C ratio was 500 times smaller than today’s value, this would be equivalent to 100 p MC/500 = 0.2 p MC.
Second, such large calculated ages are based on the C/C ratio has remained unchanged for tens of thousands of years.
A global flood like the one described in the Bible would invalidate this assumption.This value of 0.2 p MC is very close to the value of 0.195 p MC found within Figure 1.About nine half-lives would have to elapse for a starting value of 100 p MC to decrease to 0.2 p MC.Yet this assumption leads to a contradiction: If these organic samples really are many millions of years old, then they should be radiocarbon “dead.” But they aren’t! Evolutionists have attempted to blame these surprising results on a number of mechanisms. Furthermore, laboratories take great pains to keep contamination to a minimum, and researchers have found that, provided a sufficiently large testing sample is used (in the ballpark of 100 milligrams or so), the amount of such possible lab contamination is negligible compared to the C already present within the specimen.Finally, although contamination can sometimes occur, it should not be assumed in a particular instance unless there are good reasons to believe that it has.In principle, this decay rate may be used to “date” the time since an organism’s death.