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Heating the mineral (or exposure to light) releases electrons, and produces a flash of light, setting the clock to 0 (maybe only partial).

Thereafter, luminescence accumulation is proportional to age.

The concentration of uranium can be determined by the induced fission of U 235 by neutron irradiation of the sample.

Since the ratio of U 235 to U 238 is known, and is constant, a comparison of the number of tracks from natural fission and the number from induced fission will give the age of the sample.

Obsidian breaks with a and is easily chipped into precise and delicate forms.

Two dating methods have been applied to obsidian: it generally went out of favor for everyday purposes (perhaps as a result of competition from metal tools) but it continued to be used for prestige objects in some areas, especially by the Minoans and Mycenaeans.

Obsidian has been quarried and traded by western Melanesians since at least 19,000 bp, with the earliest-used and most important source being that at Talasea on SYNONYMS OR RELATED TERMS: obsidian hydration layer dating, obsidian dating CATEGORY: technique DEFINITION: A method of dating in which the age of an obsidian artifact is established by measuring the thickness of its (layer of water penetration) and comparing that to a known local hydration rate.

C dating, thermoluminescence is related to radioactive decay.

Thermoluminescence is produced by radioactive decay particles (electrons), trapped in mineral grains.

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