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So, such radiocarbon in allegedly older samples could theoretically come from a secondary source like contamination, background noise, or neutron capture. For example, living bacteria might infest a dinosaur bone but the journal reports that this doesn't affect its carbon date because the bacteria doesn't feed on the 14c in the atmosphere but in the bone!
As we mentioned above, the carbon-14 to carbon-12 ratio in the atmosphere remains nearly constant.
If you ever wondered why nuclear tests are now performed underground, this is why.