Radiometric dating problem set
This is highly significant, as it means that the initial conditions are known to a high level of confidence.The other point that Justin made was that the dating for Uranium/Lead can be derived from 3 sources: U238 decay, U235 decay and the lead isotope ratio.Where the bottom part intersects the Concordia curve is said to be the ‘age’ of the metamorphic event.However, this only works if there is one metamorphic event.
I submit that there is no such independently and unarguably known age—unless one is prepared to accept the age that is derived from the Bible, that was provided to us by God, an eyewitness, and some reliable scribes.
I did not discuss this technique because it seems a pretty straightforward combination of various parent-daughter relationships.
The Wikipedia article that you reference would seem to confirm this.
If there is more than one metamorphic event, and for almost every situation there would be many, the intersection of the line with the Concordia is meaningless.” I note that in the Wikipedia article that you identify, in the 0.1–1 percent range” (my emphasis) for this technique, confirming the point I made in my article that the uncertainties quoted for radiometric ages (and indeed all other quantities) are a measure of precision (or repeatability) of the .
I also note that the last sentence in the lead-in section identifies someone as “having used it [this technique] to obtain one of the earliest accurate estimates of the age of the Earth.” However, I would question how it is known that the age estimate is accurate.