Coalified Wood; how the 222Rn migration hypothesis accounts for Gentry's observations
Please read my paper in depth, so that you can follow this.
I will try to provide a quick overview here: As we see, for an Uranium(238) halo to exist with all of its rings present, there must be no way that the Radon gas formed in the course of the stepwise decay of the 238U can escape the location where it is being generated. The 'radiocenter' must be completely and tightly enclosed by the mineral crystal in which it is found. (The particle must be, so to speak, "hermetically sealed" into the host mineral.)
Point 1) Gentry states (video; Gentry; 199?) that his coalified wood halos are Uranium halos. (Formerly he claimed they were 210Po.)
Point 2) He assumes that since there is very little Lead (206Pb) in the radiocenters of these halos, they must be much younger than is indicated by the scientific age estimate of the stratum in which the coalified wood is found. (This is standard radiometric dating reasoning: if there is a 238U-bearing particle decaying, its age must be directly related to the amount of the final, stable decay product (206Pb, in this case) which is detectable therein by mass spectrometry.)
Point 3) The entire decay chain must complete decays from 238U to 206Pb in the same location, for there to be a reliably detectable amount of 206Pb remaining in that location. That is, there can be no Lead present unless all of the previous decay steps occurred in the same location; no atoms may leave that location. If they do, the Lead atoms that would have been deposited, are not deposited, for later counting by (Gentry's) mass spectrometer.
Point 4) "Coalified wood" is POROUS. That is, it is not "tight" around —does not "seal in"— any particle of uranium mineral emplaced into it. Gentry suggests/admits that the Uranium mineral particles were likely transported into the wood by groundwater or by hydrothermal fluids at some time (hence if it got in this way, the wood was porous enough to admit micron-sized particles; much larger than atoms).
The Explanation: The amount of Lead(206) in these halos must be less than would otherwise be expected, since by my hypothesis the 222Radon generated in the decay chain LEAVES. It migrates (escapes) out of the area where the Uranium mineral particle is located, thus there can be no (a) outer polonium rings (the 214Po and 218Po rings), just as Gentry finds, and (b) there definitely ought to be less Lead in the remaining particle area than would be there if the Radon(222) had not been able to escape and wander off in the coalified wood's porous structure.
(My hypothesis predicts this effect —the very effect that Gentry sees in his samples.)
Once again, it is seen that while 'Dr.' Gentry does excellent lab work and makes impeccable observations of the actual phenomena in the rocks, he yet comes to the wrong conclusions. This is perhaps because the Radon(222) atom-by-atom-over-time hypothesis is the only explanation which could have brought down his entire religiously-driven creationary "polonium" halo edifice, an unfortunate case of a strong religious prejudice preventing otherwise good science from leading to proper conclusions.
I find it quite scientifically satisfying that my hypothesis, if correct, explains not just _one_ of Gentry's "tiny mysteries," but also explains another one. This is one mark of a good scientific hypothesis --its capacity to explain more than just the one phenomenon in question.