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Pb and cs dating

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Helium is not light enough to escape the Earth's gravity (unlike hydrogen), and it will therefore accumulate over time.The current level of helium in the atmosphere would accumulate in less than two hundred thousand years, therefore the Earth is young.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.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).And from the slope of the line we can compute the amount of time which has passed since the pool of matter became separated into individual objects.

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If the source of the solar system was also uniformly distributed with respect to uranium isotope ratios, then the data points will always fall on a single line.

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.

(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.