Depending on your requirements we can travel to do TL sampling in other areas, please get in touch. You can send your items to us for TL sampling from anywhere in the world or we have TL sampling agents in:. TL testing is a dating method for archaeological items which can distinguish between genuine and fake antiquities. Working with Auction houses Antique dealers worldwide Private collectors Individuals Major museums International foundations.
Optically Stimulated Luminescence (OSL) Dating Lab
TL (Thermoluminescence) testing process - Oxford Authentication
Luminescence dating including thermoluminescence and optically stimulated luminescence is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past. The method is a direct dating technique , meaning that the amount of energy emitted is a direct result of the event being measured. Better still, unlike radiocarbon dating , the effect luminescence dating measures increases with time. As a result, there is no upper date limit set by the sensitivity of the method itself, although other factors may limit the method's feasibility. To put it simply, certain minerals quartz, feldspar, and calcite , store energy from the sun at a known rate. This energy is lodged in the imperfect lattices of the mineral's crystals. Heating these crystals such as when a pottery vessel is fired or when rocks are heated empties the stored energy, after which time the mineral begins absorbing energy again.
Our lab in Oxfordshire
All you need to build your Thermoluminescence Laboratory: from design to installation, from testing to technical support. Since many years IPSES manufactures and supplies complete laboratories for thermoluminescence analysis for universities and research institutes both in Italy and abroad, providing not only all the necessary equipment but also advice and training to guide in choosing the best solutions and using the equipment. Download - [ The alpha particle counting system Calph is a stand-alone low-level alpha counter used for accurate alpha dose measurements. It is specially conceived for dating application in thermoluminescence analyses.
Thermoluminescence tests are an important factor when dealers and collectors judge authenticity. But TL has its limitations. First, in order to insure profitability, commercial labs often limit the number of samples they take from terra cottas for analysis, generally drawing them from only two parts of a piece. Scientists who run the labs say this number is insufficient in view of the con game now taking place with terra cottas. Then there is the matter of who takes the samples.