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).
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They all have six protons since they are carbon, and therefore they are identical chemically.
The body cannot tell them apart, so they maintain approximately the same relative abundance in living tissue as it does in the atmosphere.
Using potassium-argon dating as an example, potassium-40 decays into argon-40 with a half-life of 1.25 billion years.
While the material is molten, the argon gas will escape. Thus the rock starts off with 100% K-40 and 0% Ar-40.
Because the time it takes to convert biological materials to fossil fuels is substantially longer than the time it takes for its in the atmosphere, which attained a maximum in 1963 of almost twice what it had been before the testing began.