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These example sentences are selected automatically from various online news sources to reflect current usage of the word 'chronometric.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors.
Thermoluminescence dating (TL) is the determination, by means of measuring the accumulated radiation dose, of the time elapsed since material containing crystalline minerals was either heated (lava, ceramics) or exposed to sunlight (sediments).
Relative age is the age of a rock layer (or the fossils it contains) compared to other layers.
For example, the element Uranium exists as one of several isotopes, some of which are unstable.
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Remember that a radioisotope has unstable nuclei that does not have enough binding energy to hold the nucleus together.
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. Radioactive elements give off particles and energy which causes the elements to decay.
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Most Radioactive dating is a method of dating rocks and minerals using radioactive isotopes.