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Wikipedia radiocarbon dating uranium lead dating

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The radiometric dater then uses the half-life of all four isotopes to find an age range the rock should be in.The half-lives of the cascade from uranium-235 to lead-207 has been been extrapolated to about 704 million years and the cascade form uranium-238 to lead-206 has been calculated to about 4.47 billion years.Once all these assumptions are taken, the equation above simplifies to .

This temperature makes the zircon hard to pull out substances out of it.

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.

Most radiometric daters prefer using zircon for these reasons, but it is not the only compound used for uranium-lead dating.

Some other compounds used that have zirconium are zirconolite, and badeleyite.