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To obtain a truly absolute chronology, corrections must be made, provided by measurements on samples of know age.

The most suitable types of sample for radiocarbon dating are charcoal and well-preserved wood, although leather, cloth, paper, peat, shell and bone can also be used.

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.

In dead material, the decayed 14C is not replaced and its concentration in the object decreases slowly.For both pieces: curve (a) is the TL emitted by a sample of powder taken from the object, curve (b) is a laboratory induced glow-curve curve (c) is the background.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.The TL is measured using a sensitive detector called a photomultiplier tube.The total amount of The samples are heated and the data appears as a graph of TL against temperature, called a glow-curve.For the modern vase the archaeological signal is barely above background and well below the TL signal from the applied laboratory dose.