One way this is done in many radioactive dating techniques is to use an isochron. April 7, at We are only interested in tallying the original C still present in the sample, the surviving "parent" isotope. C dates show that Stonehenge was gradually built over the period from BC to BC, long before the Druids, who claimed Stonehenge as their creation, came to England. April 3, at 1: Wednesday, 09 September, , 7:
Why are some of those differences really, really large? Of course, when we reach the upper limit of the method, around 40, years for the standard techniques, we should allow for much greater uncertainty as the small amounts of C remaining are much harder to measure. This idea [that the fluctuating magnetic field affects influx of cosmic rays, which in turn affects C formation rates] has been taken up by the Czech geophysicist, V. Wile, I was waiting for you to comment on this, because I wanted to ask if you think this problem can be extrapolated to other isotopes such as lead and argon.
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