Rubidium 87 radiometric dating
Instead, Rb is a dispersed element in trace amounts in other minerals. 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. 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. Yet much research effort remains to be done to make further inroads into not only uncovering the flaws intrinsic to these long-age dating methods, but towards a robust understanding of radioisotopes and their decay during the earth’s history within a biblical creationist framework. One crucial area the RATE project did not touch on was the issue of how reliable have been the determinations of the radioisotope decay rates, which are so crucial for calibrating these dating “clocks.” Accurate radioisotope age determinations depend on accurate determinations of the decay constants or half-lives of the respective parent isotopes. 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).
However, further study is warranted to explore any potential significance in this discrepancy in half-lives and decay constants between earth materials, and meteorites and lunar 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. Because the decay energy is divided between the β-particles and the anti-neutrinos, the β-particles have a smooth distribution of kinetic energy from the total energy down to zero. When attempting to determine the decay constant by direct counting the low-energy β-particles cause great problems because they may be absorbed by surrounding Rb atoms before they ever reach the detector.