This I have demonstrated both by visual inspection before and after prolonged immersion of the crystals into an aqueous dye solution before proceeding with either peeling the biotite with scotch tape, or mechanically with a sharp blade. Either of these procedures can induce cleavage separations, but it is a non sequitur to imply - as Wise implicitly does - that these experimentally-induced separations are the norm for the original unstressed crystals.
Clearly, an investigator can always choose perfect, defect-free crystals to search for halos if he takes care to do so. But Po halos in defect-free areas disprove Wise's claim that it is impossible to get away from cracks in the biotite; this result in itself shows that his speculations about the secondary origin of Po halos in biotite, as described in his section 4, are without any scientific foundation. And there is more.In a 1968 Science report2 I published a definitive study showing that fossil alpha-recoil (α-recoil) analysis of many Po-containing mica specimens revealed no excess of α radioactivity near Po-halo centers. The purpose of the study was to test whether there was any evidence for any migration/movement/diffusion of any hypothetical α-emitting precursors toward the Po centers. Such movement would necessarily have been accompanied by the α decay of such emitters as they moved toward the Po-halo centers along the same cleavage plane containing the centers. Creationism evidence, creationism evidence,theory of creation,creation science,
The recoil nucleus from any α decay produces a tiny recoil pit, or track, which is rendered visible by an HF acid etch of the basal cleavage plane. In my study I measured the fossil alpha recoil density in the basal cleavage planes above, below, and through the Po halo centers. What one observes in these three areas near the Po halo centers is the same α-recoil track density that is common throughout the mica; the background density is due to the α recoils from the parts-per-million (ppm) concentrations of U and Th. I performed about a hundred experiments, which showed that 'excess' α-recoil tracks do not exist near Po-halo centers. In his section 4e, Wise attempts to cast this result in doubt by claiming the absence of excess track density is only apparent. Experiments show this is false. Creationism evidence
The excess is truly absent. It is wrong to say the excess is only apparently absent. Movement of any hypothetical α-emitting precursors toward the Po halo centers would have left an excess of fossil α tracks in their wake. And the excess would have been huge, for well-developed Po halos show coloration corresponding to the decay of five billion Po atoms. These results unequivocally disprove the hypothesis that Po halos in granites originated from secondary radioactivity, showing instead that they originated with primordial Po. (continued...)
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