Does radioactive dating work for gases
The naturally occurring ratio of C-14/C-12 is about 10^-12 (0.000000000001).When a sample is dated, the ratio of C-14/C-12 is measured and compared to this.
The body cannot tell them apart, so they maintain approximately the same relative abundance in living tissue as it does in the atmosphere.It cannot be used to date volcanic rocks, for example.The rate of decay of N in 5,730 years (plus or minus 40 years).If we discover a rock with 75% K-40 and 25% Ar-40, we know it has been solid for 0.625 billion years (half of a half-life).Similarly, If we discover a rock with 50% K-40 and 50% Ar-40, we know it has been solid for 1.25 billion years. Note that we do not need to know how much material was present originally, only the ratios that are present today. There are three naturally occurring isotopes of carbon in the environment: carbon-12, carbon-13, and carbon-14.