Example of carbon dating
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The main limitations of using Carbon14 dating to find the age of something that is carbon base are firstly the possibility that carbon may be absorbed by some things making it more difficult to get an absolutely accurate age and secondly, with Carbon14 only having a half life of 5,568 years the maximum theoretical limit for detection is 100,000 years.
An example of an isotope: carbon, carbon12 is the elemental form, carbon14 is an isotope of Carbon (1) After several times the half-life, the amount of C-14 that remains is so small that it is hard to measure accurately.
First of all, it's predicated upon a set of questionable assumptions.It takes about 5,730 years for half of a sample of radiocarbon to decay back into nitrogen.It takes another 5,730 for half of the remainder to decay, and then another 5,730 for half of what's left then to decay and so on.Precise measurements taken over the last 140 years have shown a steady decay in the strength of the earth's magnetic field.This means there's been a steady increase in radiocarbon production (which would increase the ratio).