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(I believe this argument was originally put forth by Mormon young-Earther Melvin Cook, in a letter to the editor which was published in .) But helium can and does escape from the atmosphere, at rates calculated to be nearly identical to rates of production.In order to obtain a young age from their calculations, young-Earthers handwave away mechanisms by which helium can escape.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.The resulting plot has data points for each of five meteorites that contain varying levels of uranium, a single data point for all meteorites that do not, and one (solid circle) data point for modern terrestrial sediments.A young-Earther would object to all of the "assumptions" listed above.However, the test for these assumptions is the plot of the data itself.For example, Henry Morris says: He lead to similar results, i.e., a rate virtually identical to the estimated production flux.Another possible escape mechanism is direct interaction of the solar wind with the upper atmosphere during the short periods of lower magnetic-field intensity while the field is reversing.
However, they are quite popular in modern creation-"science" literature (even though they should not be!
The most direct means for calculating the Earth's age is a Pb/Pb isochron age, derived from samples of the Earth and meteorites.
This involves measurement of three isotopes of lead (Pb-206, Pb-207, and either Pb-208 or Pb-204).
Unfortunately, the age cannot be computed directly from material that is solely from the Earth.
There is evidence that energy from the Earth's accumulation caused the surface to be molten.