- USA How is this excess of radium being produced? The carbon dating limit lies around 58, to 62, years. This causes induced fission of U, as opposed to the spontaneous fission of U.
So we have two kinds of processes taking place. So one could argue that any variations in Pb ratios would have to result from radioactive decay. The concentration of Pb is usually so much higher than U, that a 2- to 3-fold increase of U doesn't change the percent composition much e. Any process that is concentrating one isotope of radium will probably concentrate the others as well and invalidate these dating methods, too.
- I think you are asking about radiometric dating rather than specifically carbon dating. Radiometric dating involves measuring the proportion...
- Radiometric dating - Wikipedia
You can supplement and survey the illustrations.
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Further, the silicon content of the melt becomes enriched toward the latter stages of crystallization. This rising body of magma is an open system with respect to the surrounding crustal rocks. Such mixings can produce arbitrary isochrons, so these cannot be detected by any mixing test.
This mechanism was suggested by Jon Covey and others. For this reason, this arrangement of minerals became known as Bowen's reaction series. This is interesting because both radium and lead are daughter products of uranium. - USA