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Thermoluminescence dating

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Thermoluminescence Dating Thermoluminescence can be used to date materials containing crystalline minerals to a specific heating event.

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.

Each time the sample is irradiated and then heated, the pre-dose peak increases. The first increase is due to the natural dose which the piece has absorbed over its life-time.

The sample is then given a laboratory irradiation and a second increase is measured.

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.

When we receive your sample we must first prepare it for measurement.

The complex history of radioactive force on a sample can be difficult to estimate.

By comparing the glow-curves we can calculate the dose of radiation absorbed by the piece during its lifetime.Powder samples (from pottery and bronze cores) are mixed with acetone and allowed to settle, so that fine grains, approximately 1/100mm. These grains are deposited and dried onto aluminium discs (for fine-grain analysis) or rhodium (for pre-dose analysis).Any remaining powder is dried and used for radioactivity measurements to complete the dating calculation. When the glue is dry, they are cut into slices 1/4mm thick with a fine diamond blade. Each slice is soaked in acetone after cutting to remove the glue. The remaining core is crushed and used for radioactive analysis to complete the dating calculation.Radioactive measurements on the clay tells us how much radiation the piece is receiving each year.This enables us to calculate the approximate age of the piece.Sources: “Dating In Exposed and Surface Contexts”, ed.: Beck, Charlotte.