At CIRAM, we put our dating expertise at the service of archaeology, to establish the age of terracotta objects using the thermoluminescence (TL) method.
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Thermoluminescence is a scientific dating technique used to determine the last firing of a ceramic, brick, or terracotta object. It applies to crystalline materials heated to high temperatures (above 400°C), whose luminescent signal was reset during firing.
Used to datearchaeologicalartifacts and sites where organic matter is absent or insufficient, this method makes it possible to obtain the absolute age of the firing of objects, whether they are utilitarian, architectural, or funerary.
At CIRAM, we support you in the thermoluminescence dating of your ceramics, tiles, bricks, statuettes or other fired artifacts, from sampling to interpretation of the results.
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Thermoluminescence dating is based on measuring the energy trapped in minerals. This energy is released as light when the sample is heated in the laboratory. The intensity of the luminescent signal is proportional to the time elapsed since the last firing.
At CIRAM, we carry out:
Our equipment is calibrated to ensure highly reliable results, even on old, eroded or fragmentary objects.
Find out more about TL datingOur TL dating process includes:
Together, we define your objectives and the objects to be dated.
Depending on the nature of the object, a sample can be taken by you, with our assistance. We provide a precise protocol to avoid contamination.
Our specialists process samples under rigorously controlled conditions.
Analysis of TL signals, calculation of equivalent dose and annual dose.
You receive a full report with dating, method used, uncertainties and background information.
By calling on CIRAM, you benefit from:
All archaeological terracotta (ceramics, bricks, tiles, statuettes, kilns) and heated minerals (hearthstones, flints, etc.).
Yes, provided you have an authentic, unconsolidated fragment. It is sometimes necessary to harvest from a non-visible part.
In general, 2 to 3 cm³ of clay is sufficient. We'll work with you to ensure precise, minimum sampling.
TL is reliable for objects fired between 200 and 300,000 years ago. It is particularly used for prehistoric and ancient periods.
The average lead time is 3 to 4 months, depending on the number of samples and the complexity of the context.
The margin of error varies according to the object and storage conditions, but is generally around ±5%.
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