You should find 14C in dinosaur bones even if they are millions of years old. It is nearly impossible to prevent low level contamination of any sample. There can even be in situ 14C production within the fossil itself due to background radiation. The carbonization process used to prepare the samples also introduces low levels of 14C. The instruments that measure 14C content will have noise and carryover which results in spurious detection low levels of 14C.
Those sources of contamination are all very present!
And considering that the C14 level in the atmosphere is on the close order of 1 part per trillion to start with, and that level declines per the half life, it doesn't take much to introduce some contamination. This is particularly true with a sample, such as dinosaur "bone" that has no C14 left.
Creationist "scientists" are pretty good at getting "accidental" contamination it seems and then making grand claims. But then, that's creation "science" for you.
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