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He understood that archaeological artifacts were readily available.After all, this what the archeologist guessed in their published books.
Recently, however, new research has revealed that the decay rates may have been drastically different in the unobservable past. Certain crystals called zircons, obtained from drilling into very deep granites, contain uranium which has partly decayed into lead.
So when you hear of a date of 30,000 years for a carbon date we believe it to be early after creation and only about 7,000 years old.
If something carbon dates at 7,000 years we believe 5,000 is probably closer to reality (just before the flood).
In this case, U238 is the “parent” and Pb206 is the “daughter.” Scientists begin by measuring how long it takes for a parent isotope to decay into a daughter isotope.
In this particular case, it takes 4,460,000,000 years for half of a sample of U238 to decay into Pb206.