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The importance of internal checks as well as interlaboratory comparisons becomes all the more apparent when one realizes that geochronology laboratories are limited in number.Because of the expensive equipment necessary and the combination of geologic, chemical, and laboratory skills required, geochronology is usually carried out by teams of experts.

The rock or mineral must have remained closed to the addition or escape of parent and daughter atoms since the time that the rock or mineral (system) formed. It must be possible to correct for other atoms identical to daughter atoms already present when the rock or mineral formed. In isochron methods that make use of the rubidium–strontium or samarium–neodymium decay schemes (see below), a series of rocks or minerals are chosen that can be assumed to have the same age and identical abundances of their initial isotopic ratios.

Radioactive decay can be observed in the laboratory by either of two means: (1) a radiation counter (parent atoms.

The particles given off during the decay process are part of a profound fundamental change in the nucleus.

Given below is the simple mathematical relationship that allows the time elapsed to be calculated from the measured parent/daughter ratio.

The age calculated is only as good as the existing knowledge of the decay rate and is valid only if this rate is constant over the time that elapsed.

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