Ams dating technique
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.
The tree ring sequence adjacent to the slab's bark matched the sequence near Methuselah's core.
"Dendrochronologists [scientists who study tree rings] have built sequences for a number of tree species, including German, Irish and Polish oaks, Patagonian cypresses, Lebanese cedars, pine, yew, spruce, and chestnut.
This pushed the calibration back beyond recorded history almost to 10,000 BP (years before the present.) One valuable source of samples of various ages came from a bristlecone pine tree called "Methuselah" in the White-Inyo mountain range of California.
Samples from the tree were able to generate calibration points back to that date. It is narrow or broad, depending upon whether the weather during that year was dry or wet, and whether the tree was exposed to various stressors.
He found an irregular slab from a bristlecone pine that spanned the years 3050 BCE to 2700 BCE.
Thermoluminescence was first clearly described in a paper presented to the Royal Society (of Britain) in 1663, by Robert Boyle, who described the effect in a diamond which had been warmed to body temperature.