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What makes this fact useful is that they occur at different rates, as expressed in their half-lives (the time it takes for half the atoms to decay).

The 235U–207Pb cascade has a half-life of 704 million years and the 238U–206Pb cascade is considerably slower, with a half-life of 4.47 billion years.

In whole rock isochron methods that make use of the rubidium–strontium or samarium–neodymium decay schemes (see below), a series of rocks or minerals are...

...dating, for example, because most minerals do not take argon into their structures initially.

For most dating requirements it has been superseded by uranium-lead dating (U-Pb dating), but in certain specialized situations (such as dating meteorites and the age of the Earth) it is more important than U-Pb dating. As evident by the equation, initial Pb isotope ratios, as well as the age of the system are the two factors which determine the present day Pb isotope compositions.

If the sample behaved as a closed system then graphing the difference between the present and initial ratios of Pb should produce a straight line.

lead uranium dating-84

Uranium-Lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock.

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.

Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable.

If nothing disturbs the grain to release any of this radiogenic lead, dating it is straightforward in concept.

Lead-lead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite.

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