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Likewise, the conditions that must be met to make the calculated age precise and meaningful are in themselves simple: 1. Different schemes have been developed to deal with the critical assumptions stated above.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.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.

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The same is true regarding gravitational, magnetic, and electric fields, as well as the chemical state in which the atom resides.The results are then tested for the internal consistency that can validate the assumptions.In all cases, it is the obligation of the investigator making the determinations to include enough tests to indicate that the absolute age quoted is valid within the limits stated.isotope is converted into another specific atom or isotope at a constant and known rate.Most elements exist in different atomic forms that are identical in their chemical properties but differ in the number of neutral particles— neutrons—in the nucleus.

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