For the YECers to be right, the errors would have to be greater than 90%. For example, the art dated to 40,000 BC would have to be redated to less than 4,000 BC, about an 86% error.
I'd consider that to be a 700 percent error. The creationist would claim that the true age of the artifact is 6000 years and would argue that you have measured the age to be 7 times greater than that (42000 years).
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