Uranium decay dating
In order to obtain a young age from their calculations, young-Earthers handwave away mechanisms by which helium can escape.For example, Henry Morris says: He lead to similar results, i.e., a rate virtually identical to the estimated production flux.
The actual underlying assumption is that, if those requirements have not been met, there is no reason for the data points to fall on a line.This value is derived from several different lines of evidence.Unfortunately, the age cannot be computed directly from material that is solely from the Earth.This involves measurement of three isotopes of lead (Pb-206, Pb-207, and either Pb-208 or Pb-204).A plot is constructed of Pb-206/Pb-204 versus Pb-207/Pb-204.
Search for uranium decay dating:
The current level of helium in the atmosphere would accumulate in less than two hundred thousand years, therefore the Earth is young.