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Just looking at this list, I can see that none of these are actually assumptions used by radioactive dating methods and/or they are known issues and compensated for.

Something that this particular website has none of.

Uranium 235 decay to lead has a half-life of 713 million years, so it is well suited to dating the universe.other isotope pairs cover intermediate time periods between the spans for carbon 14 and uranium.

Some so-called creation scientists have attempted to show that radiometric dating does not work on theoretical grounds (for example, Arndts and Overn 1981; Gill 1996) but such attempts invariably have fatal flaws (see Dalrymple 1984; York and Dalrymple 2000).

And this isn’t really an assumption as the decay rates have been tested in the laboratory for a hundred years or so, we have an example of a natural nuclear reactor where we can measure the various products and determine the decay rates (and the fine structure constant), and we can observe the past by looking deep into the past of the universe.

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    Usually these lies are white lies intended to be polite and /or protect someone’s feelings.

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    It also includes "Bottle Dating Worksheets" (pages 51 to 55) by Rebecca Allen and this author to assist in the systematic dating of an historic bottle based on the information in that dating key as well as other information on the website.