At CIRAM, we put our expertise in archaeometry to archaeologists, museums and institutions for reliable luminescence dating (OSL) adapted to the study of sedimentary deposits.
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The optically stimulated luminescence (OSL) dating (OSL) is an essential method for dating the last exposure of sediments to light. It enables us to reconstruct the chronology of events linked to burial, such as the occupation of a site, the digging of a ditch, the formation of a dune or the use of a burial mound.
Unlike radiocarbon dating which applies to organic material, OSL dates minerals (quartz or feldspar) contained in sands or silts. It can therefore be used 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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To date sediments by OSL, we implement a controlled analytical chain:
Our facilities are specifically equipped to guarantee reliable results, with red-light handling devices, protected analysis chambers and advanced calculation software.
Find out more about OSL datingCIRAM's OSL analysis process follows 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, documented report.
When you call on CIRAM to date your sediments, you benefit 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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