This is extrapolation using mostly conjecture, making a concrete statement about a variable doesn't prove anything it just sounds authoritative, if you have an open mind then you are open to the variables, but it is obvious that we are preceeding from multiple directions, so try not to make confident assertions about variables and I will too.Polonium halos are better explained as radon halos, which is an inert gas that can migrate away from their uranium source. The decay energy of radon is nearly equal to that of polonium and therefore their halos are indistinguishable from each other.
Secondly, I already discussed why an accelerated decay cannot explain uranium halos. If you change the decay rate, you change the decay energy. If you change the decay energy, you change the distance the damage occurs in the mineral. The radius we observe in uranium halos is consistent with the decay energy we observe with uranium decay, which means it must have taken millions of years to create the halos and that the rate of that decay must have been constant over that time.
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