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Editor’s note: We’ve received a wide range of responses to Dr.Vernon Cupps’ recent radioactive dating Impact articles.When they do occur in rock samples, they are usually in such small amounts that they cannot be seen without a microscope (see Figure 1).Therefore, separating the element from the rock sample is difficult.The potassium-argon dating method—once heralded as a solid scientific method—has proven to be unreliable.
From 1964 through 2012, seven attempts were made to directly measure the half-life of Rb.
In any case, there is some uncertainty in one of the critical parameters used by isochron dating models of Rb decay.
A little-advertised characteristic of rubidium-containing minerals is that they are moderately rare in nature.
The results of these measurements have varied from 4.77 ± 0.10 x 10 and is the current value recommended by the Union of Geological Sciences.
Whether this decrease is real or simply due to better measurement techniques remains uncertain.