Explain the process of thermoluminescence dating

09-Mar-2017 08:33

The older the pottery, the more radiation it has absorbed and the brighter the pottery sample glows.By measuring the TL, we can calculate how much radiation has been absorbed and use this information to calculate the approximate age of the pottery.The ancient piece : (a) is way above the background (c), and approximately midway between background and (b) The modern piece : (a) is only just above the background (c) and way below (b) Porcelain and certain other types of clay cannot be tested using the fine-grain method. The TL reader is programmed to measure changes in the 110C peak of quartz (the pre-dose peak) in the clay.

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.A non-negligible part of materials which ceramic is usually made of (like quartz and feldspars) is thermoluminescent: those materials have trap states that can capture electrons after interaction with alfa, beta and gamma rays existing in nature.When these materials are heated to several hundreds of Centigrade degrees, electrons are evicted from trap states and energy is emitted in form of light: thermoluminescence (TL).Since measured TL depends on time of exposition to natural radiations but also on the intensity of these radiations, to achieve a precise dating we need information about radioactivity of the area where the object was found.

Mar 8, 2017. Luminescence dating including thermoluminescence and optically stimulated luminescence is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past.… continue reading »

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