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Therefore, a radiocarbon year would not correspond to an actual year.As explained in recent measurements show that the ratio of carbon-14 to carbon-12 has been building up in the atmosphere.Outside the range of recorded history, calibration of the 14 clock is not possible.
The helium still locked in the samples was studied as well as the rate at which the helium diffused from the rock.
Until recent years, scientists who believe in creation haven't had the necessary resources to explore radiometric dating in detail.
A 10 gram sample of U-238Now that has changed, and some important discoveries are being made.
When granite rock hardens, it freezes radioactive elements in place.
The most common radioactive element in granite is Uranium-238.The key questions then are: Has the atmospheric ratio of carbon-14 to carbon-12 changed in the past, and if so, why and how much?The assumption usually made, but rarely acknowledged, is that the ratio of carbon-14 to carbon-12 in the atmosphere before the industrial revolution has always been the sameabout one in a trillion.However, for the last 3,500 years, the increase in the ratio has been extremely slight.