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In this article we shall discuss the basis of the U-Pb and Pb-Pb methods, and also fission track dating.

The trails cannot be observed optically, but because they are very reactive, they can be enlarged with chemical etchants to become visible under an optical microscope.

Several different experimental methods are available which attempt to reach this ideal.

Different approaches may be best for different types of sample material.

(1979a), but was effectively the method adopted by the earliest workers (e.g. The term refers to the fact that spontaneous and induced tracks are counted in different splits or sub-populations of material, which are nevertheless assumed to sample the same population.

This depends on the material having a homogeneous distribution of uranium between the two splits.