How is carbon 14 dating used
Measuring the intensity of the luminescence can determine how much time has passed since the last time the object was heated.The light is proportional to the amount of radiation absorbed since the material was last heated.Samples should be placed in a polyethylene bag and sealed with electrical tape.To test the date we need to measure the sample’s thermoluminescence light which is then correlated to the accumulated dose of ionizing radiation.This usually occurs when the items are heated to 350 degrees Celsius.Therefore, in archaeology, thermoluminescence dating works best for ceramics, cooking hearths, incidentally fire-cracked rocks, and deliberately fire-treated rocks, such as flint or chert.Then we need to correlate thermoluminescence light to radiation dose rate per year which the sample has received since its last clock resetting event.Eventually, we will follow this formula to found out how many years old the sample is: Age (year) = accumulated dose / dose rate per year Thermoluminescence dating can be performed only in a specialized laboratory which will have a chemical section for the treatment of the samples with reagents and a radiation hazard restricted area.
TL is based on the fact that almost all natural minerals are thermoluminescent.
A sample of the earth also needs to be collected so environmental radiation can be tested.
The wetness of the soil and the sample should also be recorded.
Instead, a less sophisticated method that would deceive TL testing is to reuse original broken and unmarketable pieces.
Forgers commonly use the bottom of an original broken vessel, which has no commercial value, and make a new fake vessel on top of it.