At CIRAM, we put our expertise in archaeometry at the service of archaeologists, museums, and institutions for reliable luminescence dating (OSL) adapted to the study of sedimentary deposits.
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Optically stimulated luminescence (OSL) dating is an essential method for dating the last exposure of sediments to light. It allows for the reconstruction of the chronology of burial-related events, such as site occupation, ditch excavation, dune formation, or the use of a burial mound.
Unlike radiocarbon dating which applies to organic materials, OSL dates the minerals (quartz or feldspar)contained in sands or silts. It thus makes it possible to date contexts where organic remains are absent or poorly preserved.
At CIRAM, we're with you every step of the way, from advice on sampling to analysis and interpretation of results, guaranteeing rigorous protocols.
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For dating sediments by OSL, we implement a controlled analytical chain:
Our facilities are specifically equipped to guarantee the reliability of results, with handling devices under red light, protected analysis chambers, and advanced calculation software.
Find out more about OSL datingThe OSL analysis process at CIRAM suit a rigorous protocol:
We work with you to identify the objectives of dating and the specific features of the sedimentary context.
We provide you with a detailed protocol to guarantee unimpaired sampling.
Laboratory processing under controlled conditions.
Analysis of light signals, determination of equivalent dose.
Determination of annual dose.
Calculation of burial age, drafting of a clear and documented report.
Calling on CIRAM to date your sediments means benefiting from:
OSL applies to sands, silts or sediment layers rich in quartz or feldspar. It is used in alluvial, aeolian, colluvial or archaeological contexts.
The method is effective for periods ranging from a few thousand to several hundred thousand years (up to 700,000 years depending on the context).
Approximately 100 to 300 grams of sediment are required. Samples should be taken in opaque tubes, in a dark environment.
Yes, OSL is complementary to carbon 14 or thermoluminescence and enables chronological data to be cross-referenced.
It takes between 3 and 5 months from receipt of the samples to delivery of the report, depending on the age of the samples.
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