BobRyan
Well-Known Member
It should be noted that when Gentry responds to this he points out the ratios for Po210 to Po218 in the "primordial case" are not at the 67,000 to one ratio "expected" and "observed" with well established coalfied wood examples of the Uranium to lead sequence. In fact you have MORE Po218 than Po210 in the primordial case. And these are shown to be in monolithic contiguous structures without breaks/cracks etc.Helen
Gentry considered the polonium halos he studied to be primordial because there was no precursor or parent element rings to be seen. Gentry's point was that, without evidence of a precursor, and since that type of polonium requires a precursor element, these halos must have been created or formed in situ. Since then, other possibilities have emerged, which can be found in the other literature on the topic.
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Imagine the Earth as a huge clump of gasses - how long does it take for them to consolidate - and for the crust to cool enough to create pressure and density so that Granite can form?
Polonium will let you have all of 5 minutes. Take as much of it as you like.
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Helen
That was from Bob -- Bob, it is not a matter of how fast granite forms.
Even Richard C's web link does seem to make the point that the length of time of the half-life cycle is making the case for the age of the rock.Robert Gentry
On the other hand, this extraordinary large abundance of 210Po halos agrees with what I discovered in the coalified wood specimens.8 Moreover, in examining thousands of secondary Po halos in coalified wood, I have yet to find a clear example of either a 214Po or 218Po halo. To summarize, the reason for this disparity is that the 139-day half life of 210Po enabled a sufficient number of these atoms to survive long enough in the gel-like wood to be collected at the PbSe sites, where they decayed and formed 210Po halos. In contrast, the far more rapidly decaying atoms of 214Po and 218Po - with respective half-lives of 164 microseconds and 3 minutes - largely decayed away before they were collected at these same sites.
Bob