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Rb half-life and decay constant, there is still no consensus on the absolute values.
Even the more accurate determinations of the last 30 years have resulted in discrepancies.
Radioisotope dating of rocks and meteorites is perhaps the most potent claimed proof for the old age of the earth and the solar system.
The absolute ages provided by the radioisotope dating methods provide an apparent aura of certainty to the claimed millions and billions of years for formation of the earth’s rocks.
Determinations based on comparisons of ages of earth minerals and rocks give two different values of the Rb half-life and decay constant to the values using determinations based on comparison of ages of meteorites and lunar rocks. Zum β-zerfall des rubidiums 87: Nachpriifung des zerfallsschemas und neubestimmung der halbwertszeit.
Yet the most recent direct counting and in-growth experimental determinations only agree with the most recent determinations based on comparison of the Rb-Sr ages of earth minerals and rocks with their U-Pb “gold standard” ages.
For example, it occurs in easily detectable amounts in common K-bearing minerals, such as the micas (muscovite, biotite, phlogopite and lepidolite), K-feldspars (orthoclase and microcline), certain clay minerals, and the evaporite (precipitite) minerals sylvite and carnallite. The latter is the time it takes for half of a given number of the parent radionuclide atoms to decay.
The proportional counter has a much lower noise level, so the energy cut-off can be set as low as 0.185 ke V.
Rb films with thicknesses down to 1 µm were measured by Neumann and Huster (1974), and extrapolated to zero thickness by Neumann and Huster (1976) to derive a ).
Both the scientific community and the general public around the world (except perhaps in the USA) thus remain convinced of the earth’s claimed great antiquity.
The 1997–2005 RATE (arth) project successfully made progress in documenting some of the pitfalls in the radioisotope dating methods, and especially in demonstrating that radioisotope decay rates may not have always been constant at today’s measured rates (Vardiman, Snelling, and Chaffin 2000, 2005). At the same time the technology was developed to measure the concentrations of Rb and Sr by isotope dilution, combined with the separation of these elements by cation exchange chromatography.