Some so-called creation scientists have attempted to show that radiometric dating does not work on theoretical grounds (for example, Arndts and Overn 1981; Gill 1996) but such attempts invariably have fatal flaws (see Dalrymple 1984; York and Dalrymple 2000).Other creationists have focused on instances in which radiometric dating seems to yield incorrect results.
I accept he could have rested halfway or swum the first half much faster but if you took enough of these measurements (without seeing the start or even the finish) you would get a reasonable idea of how long it takes to swim 1500 meters. The dating is calibrated against how long the carbon 14 takes to decay in a certain known period.
As I am sure you are aware radioactive carbon 14 is formed by the action of solar radiation on nitrogen in the atmosphere.
water which came from the river through the soil), and so on.
Furthermore, because his skull was found separated from his body, his body had probably not been buried deep beneath the soil, meaning his body was probably originally put in a shallow grave, near the river.
Of course, there are many problems with such dating methods, such as parent or daughter substances entering or leaving the rock, as well as daughter product being present at the beginning.
Radiometric dating of rocks and minerals using naturally occurring, long-lived radioactive isotopes is troublesome for young-earth creationists because the techniques have provided overwhelming evidence of the antiquity of the earth and life.So the concentration of carbon14 is relatively constant.The chemistry of C14 is identical to C12 so all living matter has the same proportion of C14 due to constant exchange of carbon between plants, animals, atmosphere etc.However, scientists totally ignored these items and simply gave a single date as if the skeleton, on the day he died, had been wrapped in plastic, frozen and protected from all kinds of moisture, heat and light.By giving his bones a date of 9,000 years old, they are claiming to prove that Adam and Eve were not placed on this earth about 6,000 years ago, which would be the date a Bible scholar would pick for the creation of Adam and Eve.These long time periods are computed by measuring the ratio of daughter to parent substance in a rock and inferring an age based on this ratio.This age is computed under the assumption that the parent substance (say, uranium) gradually decays to the daughter substance (say, lead), so the higher the ratio of lead to uranium, the older the rock must be.Once the plant or animal dies this exchange is cut off and the proportion of the decaying radioactive carbon 14 begins to decrease.So after about 4000 years there is only about half the the original C14 left and about 4000 years later half again.A swimming race illustrates the simple principles involved in measuring time.This swimmer is competing in a 1,500 metre race and we have an accurate, calibrated wristwatch.