Thermoluminescence tl dating dating a single mum
Free electrons can be emptied from traps by exosure to sufficient heat or light.
This article explains the basic process behind TL, and how it is applied to dating.
Any remaining powder is dried and used for radioactivity measurements to complete the dating calculation. When the glue is dry, they are cut into slices 1/4mm thick with a fine diamond blade. Each slice is soaked in acetone after cutting to remove the glue. The remaining core is crushed and used for radioactive analysis to complete the dating calculation.
We have 3 fully automated, computer operated Riso Minisys TL readers for measuring the TL.
curve is from the applied laboratory dose For the genuine vase, the archaeological signal(s) are well above the background and close to the signal from the applied laboratory dose.
For the modern vase the archaeological signal is barely above background and well below the TL signal from the applied laboratory dose.
From these measurements we can calculate the age of the piece.
TL dating is a matter of comparing the energy stored in a crystal to what "ought" to be there, thereby coming up with a date-of-last-heated.
In the same way, more or less, OSL (optically stimulated luminescence) dating measures the last time an object was exposed to sunlight.
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.