the best dating sites in canada - Radiometric dating uranium
The reason for stopping at lead is because lead is not radioactive and will not change into a different element.
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Scientists know that there are geological events that can disturb the zircon and release the lead created from the uranium. To try to account for this, a radiometric dater will use many different samples and use the ones that fit the Concordia curve.
If they do not fit, it is assumed that it signifies a large geological event The part of the rock a dater will use to date the rock is normally the zircon in the rock.
For Uranium-Lead dating to work, scientists have to make three assumptions.
These assumptions are that the system being dated is a closed system; at the beginning of the time period, there are no daughter isotopes present; and the rate of radioactive decay stays the same through the whole time period.
The four isotopes are uranium-235, uranium-238, lead-207, and lead-206.
The process of dating finds the two ratios between uranium-235 and lead-207; and uranium-238 and lead-206.
With all radiometric dating processes, the accuracy of uranium-lead dating is called into question.
Some of the classic problems with this kind of dating process include what the process can really date, how far the radiometric process can date accurately, and the assumptions taken so the dating process works.
Assuming a closed system means that nothing on the outside of the rock affected the sample.Tags: Adult Dating, affair dating, sex dating