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Creationists attack all radioactive dating with the claim that radioactive decay rates may have been different in the past.
There is absolutely no valid evidence to support this claim.
The creationist argument that the ratio of C-14 to C-12 is not constant is actually based on the assumption of a young earth with an age of 10,000 years, and sudden changes in the amount of carbon dioxide in the atmosphere caused by the assumed catastrophic events of the Genesis flood.
The rate of carbon 14 radioactive decay may have been different in the past.When these organisms die, they no longer ingest C-14 (directly or indirectly) from an atmospheric source.Carbon 14 decays at a particular rate and is not replaced.The possible reason for this, the team believes, could be due to climatic conditions in our distant past.This is because pre-modern carbon 14 chronologies rely on standardised northern and southern hemisphere calibration curves to determine specific dates and are based on the assumption that carbon 14 levels are similar and stable across both hemispheres.
When the plant or animal that consumed the foliage dies, it stops exchanging carbon with the environment and from there on in it is simply a case of measuring how much carbon 14 has been emitted, giving its age.