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8) When the specimen is dug up and prepared for analysis, it is not contaminated by foreign sources of carbon.
Since my background is biological, I thought that discipline would be the obvious place to start—in particular, something about microbes doing interesting things under the surface of the Earth. It was one of the first posters in the aisle, so prominent to the casual passerby: Dinosaur bones and diamonds!
The argument is usually boiled down into the following points: 1) Accurate radioactive dating assumes that the decay rate of a radioactive material has not changed over time and is the same today as long in the past. (Although, consider the presence of C-14 in diamonds thought to be millions or billions of years old: https://answersingenesis.org/geology/carbon-14/carbon-14-in-fossils-and-diamonds/ ) (Also, there are restrictions. Sea creatures and animals that eat sea creatures are excluded, since the amount of C-14 in the ocean is much different than the atmosphere.) 4) Dating using Carbon-14 assumes that the fraction of C-14 in the atmosphere had reached a steady state value long ago and has not changed appreciably since then.
2) Dating of objects less than about 50,000 years old is done using Carbon-14, not other isotopes that have much longer half-lives, such as potassium-argon, uranium-lead, rubidium-strontium, etc. (C-14 is assumed to be created by cosmic rays hitting Nitrogen in the atmosphere.) 5) C-14 is absorbed into organisms via respiration or consuming plants that contain it.
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