Radiometric dating diamonds
In other words, the magnitude of the radius of a pleochroic halo in a particular crystal depends on the half-life of the decay responsible for the alpha particle emission. the radii of pleochroic haloes corresponding to a definite decay in a particular mineral are ...
(the same) size, then it can be safely assumed that the half-life of that decay is a constant.
The third assumption is that the sample has remained in a closed system.
This is necessary due to outside influences such as heat and groundwater that can seriously alter the original material.
Another problem that calls into question the credibility of radiometric dating is heat contamination.
For example, In 1973, in Alberta, Canada (near the town of Grand Prairie) a high voltage line fell which caused nearby tree roots to fossilize almost instantly.
However, not as well known is the fact that such methods have serious flaws which are often glossed over, or ignored when writing on, or discussing this subject in public. that (the) half-lives (of uranium-thorium-lead) are not constant but vary with time. comes from the study of pleochroic haloes which form in a rock in the following way.
They did this because it is almost certain that these lead isotopes were all present in large quantities when the earth was created.When scientists at the University of Regina, Saskatchewan were asked what the results would be if these roots were dated by Potassium Argon method.Their response was that the results: Two well-documented examples of "heat contamination" are the 18 eruptions from two Hawaiian volcanoes.For Uranium/Lead dating this means that some of the uranium that was initially present would be "leached" out of the rock.Leaching can also cause uranium to be leached into rocks that have little or no uranium in them.