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Radio halos


The radiohalos found in the biotite mica of granite and other rocks are damage caused the radiation of a-particles. They result mainly from Uranium 238, Thorium 232, and their decay products. The energy of the a-particles different in each isotope and the size of the ring results from the energy of the a-particles, this allows the isotope that produced each ring to be identified. Some are produced by the entire Uranium 238 decay series, while other are produce by Polonium 210, 214, and 218 decay series. still others are produced by the entire Thorium 232 decay series. Some are even unidentified.

Made on from data on page 115-118
Radioisotopes and the age of the Earth II

Most radiohalos are found in rock thought to have formed during the Flood so given the fact that U238 and Th232 halos take 100 millions of years to form at todays decay rates, this requires them to have formed quickly by accelerated decay. The data shows that heat from the flood wiped out all pre Flood radiohalos. Po halos make up a large number of radiohalos. This provides evidence of a world wide heating event. This evidence fits with a Global Flood, provides evidence form the Flood and for accelerated decay during the Flood.This also falsifies Robert Gentry's creation hypothosis, showing that creation hypothosis can be falsified.

Po isotopes have short half lives so they.had to come from the Uranium238 day chain.

The Uranium238 is found in zircons embedded in the biotite. Rn222 is the transport isotope, with a [[half life]] of 3.8. It's dacay produces the Po210, Po214, Po218 that produce the Po halos. Rn222 is not chenicaly active. It defusses out of zircons and desolve in water quickly.

When a Rn222 gets out of a zircon it decays, through the Po isotopes and others, and eventually to Pb206. To form a halo the Po must encounter a sodium or lead deposit since both chemically react with Po. Under the right conditions the Po is concentrated to form a halo.The problem is that left to it self , the Rn222 will go in random directions from the zircon they came from and never reach one place where the Po can be concentrated.

Hydrothermal flows occur in cooling biotite mica as water flows between layers quickly cooling the biotite. Rn222 dissolves in the water and is carried by the flow, carrying all Rn222 produced by a zircon in one direction. This allows the Po to be picked up by a small sodium or lead deposit, concentrating the Po and allowing halo to form.

Radiohalos can only form in biotite mica below 150 degrees C and Po halos can only continues to form as long as the hydrothermal flow is depositing more Po to the site. Because of the short half-lives of Po isotopes, the halo stops forming shortly after hydrothermal flow stops. Since hydrothermal flows cool rocks quickly it has to stops before the rock can stop cooling, as a result, the can not have flowed in these rocks the 100 + million years need for these halos form a normal decay rates, thus providing additional evidence of accelerated decay.

Since accelerated half life would be related to normal half life it is likely that the longer half life isotopes would be accelerated more, thus U238’s rate could be accelerated a billion times, while Rn222 and Po isotopes would be hardly affected.

Based on Rn222's half life of 3.8 days the optimum time for Po halo formation is 7-10 days from showing the the rocks cooled from 300 to 50 degrees C in that time. The darkness of many Po halos show the conditions was near optimum for Po halo formation, when this halos were formed

Further support for this model is the lack of evidence of a-particle tracks from Rn222 between U238 and Po halos. This suggests that much of the Rn222 was transported at temperatures greater than 150 degrees C. Furthermore, the fact that the center of Po halo’s is not radioactive, shows that their formation has stopped. Thus the evidence is consistent with hydrothermal transport and quick cooling.


 

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