The prefix radio as in radiometric dating means dating two girls in persona 4
Ongoing research continues to make further inroads into not only uncovering the flaws intrinsic to these long-age dating methods, but towards a thorough understanding of radioisotopes and their decay during the earth’s history within a biblical creationist framework. “Chemical Effects of α-Decay in Uranium Minerals.” Radiochimica Acta 47 (4): 177–185.
One area the RATE project did not get to investigate was the issue of how reliable are the determinations of the radioisotope decay rates, which are so crucial for calibrating these dating “clocks.” Thus, as follow-on to the RATE effort, in a recent series of papers Snelling (2014a, 2014b, 2015a, 2015b, 2016, 2017a) reviewed how the half-lives of the parent radioisotopes used in long-age geological dating have been determined and collated all the determinations of them reported in the literature to discuss the accuracy of their currently accepted values.
Ultimately, the Sm decay half-life whose accepted value has not changed since it was calibrated against the U-Pb dating of two meteorites in the 1970s, in spite of the fact that more recent thorough physical direct counting experiments suggest a higher value.
However, confidence in U-Pb radioisotope dating as the “gold standard” is very questionable, as there are now known measured variations in the U decay rate values (Boehnke and Harrison 2014; Mattinson 2010; Schoene et al. “Inventory and Assessment of Palaeoarchaean Gneiss Terrains and Detrital Zircons in Southern West Greenland.” Precambrian Research 135 (4): 281–314.
Also, there is no way of knowing what and how much migration happened in the past.
Thus, even if the outer portions of crystals are removed before isotopic analysis and the U-Pb ages obtained for the cores of crystals are concordant, there can be no certainty that they represent the dates when the crystals formed.
He documented the methodology behind and history of determining the decay constants and half-lives of the parent radioisotopes U which are used as the basis for the Rb-Sr, Lu-Hf, Re-Os, Sm-Nd, K-Ar, Ar-Ar, U-Pb, and Pb-Pb long-age dating methods respectively.
Nevertheless, accurate radioisotope age determinations not only depend on accurate determinations of the decay constants or half-lives of the respective parent radioisotopes, but on the reliability of the three assumptions these supposed absolute dating methods rely on. Ironically it is the slow decay rates of isotopes such as Sm used for deep time dating that makes precise measurements of their decay rates so difficult. Thus, it could be argued that direct measurements of their decay rates should be the only acceptable experimental evidence, especially because measurements which are calibrated against other radioisotope systems are already biased by the currently accepted methodology employed by the secular community in their rock dating methods. Minerals such as zircon are routinely used by geochronologists to confidently provide the U-Pb and Pb-Pb ages which underpin the conventional multi-millions-of-years’ timescale. These dating methods and the underlying assumptions are reviewed. “Brittle-Ductile Microfabrics in Naturally Deformed Zircon: Deformation Mechanisms and Consequences for U-Pb Dating.” American Mineralogist 97 (10): 1544–1563.