How to use carbon 14 dating
We find that about 18 such halvings are required for the p MC value to drop below 0.001 (Figures 1 and 2).
(We could “round up” the value of 0.0007 p MC at 17 half-lives to 0.001 p MC, but the 0.00038 p MC at 18 half-lives is definitely below the detection threshold.) Since each half-life is 5,730 years, this means that no C has even been detected in diamonds, which some scientists claim are billions of years old!
In principle, this decay rate may be used to “date” the time since an organism’s death.
But the calculated dates will only be accurate if the assumptions behind the method are correct.
Virtually all fossils found within sedimentary rocks are the remains of creatures that perished during the Genesis Flood about 4,500 years ago.
Yet a skeptic might point out that the amounts of C found in these organic samples are smaller than what one might expect if they are only about 4,500 years old.
And a radiocarbon result that contradicts old-earth dogma is not a good enough reason by itself to invoke contamination!
A global flood like the one described in the Bible would invalidate this assumption.Because the present decay rates of these heavier isotopes are so small, the assumption that these rates have always been constant naturally leads to age estimates of millions and even billions of years.Interestingly, however, some radioisotope methods tend to consistently yield younger age estimates than others, even when the techniques are used on the same rock units.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.