Scientists at Brookhaven National Laboratory and the Physikalish-Technische-Bundesandstalt in Germany have reported "unexplained periodic fluctuations in the [nuclear] decay rates of Si-32 and Ra-226...strongly correlated in time, not only with each other, but also with the distance between the Earth and the Sun." It is likely that similar discrepancies and fluctuations occur with other nuclear decay rates, such as that of Many people believe that carbon dating has proved that the Earth is millions or billions of years old, much older than the biblically derived date of around 6,000 years.An animal that ingested plants with relatively low C-14 proportions would be dated older than their true age." Dating laboratories do not make any allowance for the change in atmospheric levels that would have occurred as a result of Noah's Flood.This means that radio-carbon dates cannot be used to prove that the Flood did not occur, because it assumes that it did not occur.Carbon dating, or carbon-14 dating, is a method for comparing the ages of organic materials such as bones or artifacts made from anything that once lived.Unlike many other radiometric dating methods, carbon dating has been calibrated for historical periods and within that range can give reliable results.If the ratio is a quarter of what it should be (one in every four trillion) we can assume the creature has been dead for 11,460 year (two half-lives).After about 10 half-lives, the amount of radiocarbon left becomes too miniscule to measure and so this technique isn't useful for dating specimens which died more than 60,000 years ago.
They further argue that dating much older items will result in anomalous dates, which might fall within the range that carbon dating can measure.
These include the starting conditions, the constancy of the rate of decay, and that no material has left or entered the sample.
Unlike other radiometric dating techniques where it is not possible to calibrate the method against historically-known dates, limited calibration is possible for carbon dating.
This problem is especially severe in shellfish or anything that eats shellfish; it is not unusual for freshly-killed seals to be dated as several thousand years old.
...various plants have differing abilities to exclude significant proportions of the C-14 in their intake. The varying rates at which C-14 is excluded in plants also means that the apparent age of a living animal may be affected by an animal's diet.