Definition of luminescence dating
The luminescence that clothed Norhala brightened, deepening the darkness.
This is useful for ceramics, as it determines the date of firing, as well as for lava, or even sediments that were exposed to substantial sunlight.
The accumulation of trapped electrons, and the gaps left behind in the spaces they vacated, occurs at a measurable rate proportional to the radiation received from a specimen’s immediate environment.
When a specimen is reheated, the trapped energy is released in the form of light (thermoluminescence) as the electrons escape.
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Heating ceramic in a furnace resets TL accumulated by clay and other materials; from this time on, TL begins growing again as time passes; the more concentrated radioactivity where ceramic is, the quicker TL grows.