July Thermoluminescence[ edit ] Thermoluminescence testing also dates items to the last time they were heated. Unsourced material may be challenged and removed. Dendrochronology or tree-ring dating is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings. The amount of luminescence released is used to calculate the equivalent dose De that the sediment has acquired since deposition, which can be used in combination with the dose rate Dr to calculate the age. Careful sampling under dark conditions allows the sediment to be exposed to artificial light in the laboratory which releases the OSL signal. Currently, the maximum for fully anchored chronologies is a little over 11, years from present. This light can be measured to determine the last time the item was heated.
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