Accuracy of radiometric dating methods

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We have gold appearing pure at times, silver pure at times, etc. Each dating mechanism deals with this problem in its own way. At any rate, there will be some effects of this nature that will produce some kinds of changes in concentration of uranium and thorium relative to lead from the top to the bottom of a magma chamber.

This converts the only stable isotope of iodine 127I into 128Xe via neutron capture followed by beta decay of 128I. I now give a more natural three-source mixing scenario that can produce an arbitrary isochron, which could not be detected by a mixing test. To verify the accuracy of the method, several artefacts that were datable by other techniques were tested; the results of the testing were in reasonable agreement with the true ages of the objects. If I have a rock X with lots of uranium and lead daughter isotope, and rock Y with less of both relative to non-radiogenic lead , then one will get an isochron with a positive slope.

Choose country - It seems to me that a single lava flow might not mix well, and thus the age obtained would be that of the magma and not the time of the flow.