How is radiactivedating performed
If, on the other hand, it is found that the radii vary, then this is proof that the half-life of that decay is not constant. This was first shown by Joly and Henderson who conducted most of the early studies on pleochroic haloes. We have solid evidence that radioactive decay rates cannot have been constant.
In this regard it should also be pointed out that for the theory of life from non-life, and/or from amoeba to jellyfish, to man to have any chance at all of being true, then the earth must be very old. can be summarized as follows: In other words, something in the past caused a significant amount of helium to build up inside these zircons (such as from a rapid decay episode of uranium), yet, in spite of the fact that helium has been observed to leak out readily from these zircons, it has not done so: simply because it hasn't had enough time to do so -- suggesting that the zircons themselves are only a few thousand years old."There is evidence to show ...
There are at least 67 different uniformitarian (the present is the key to the past) methods of dating the earth other than long-age radiometric dating: each of which yield ages of less than 500 million years.