Neutron radiation with energies of 40 ke V to greater than 35 Me V has a dose measurement range from 20 mrem to 25 rem.In diagnostic imaging the increased sensitivity of the OSL dosimeter makes it ideal for monitoring employees working in low-radiation environments and for pregnant workers.The regenerative dose data are fit with a saturating exponential to generate a luminescence dose-response curve. The De is calculated by the intercept of the natural luminescence signal with the generated curve. G., 2000, Luminescence dating of quartz using an improved signle-aliquot regenerative-dose protocol: Radiation Measurements, v. In archaeology, OSL dating is applied to ceramics: The dated event is the time of their last heating to a high temperature (in excess of 400 °C).Recent OSL dating of stone tools in Arabia pushed the "out-of-Africa" date hypothesis of human migration back 50,000 years and added a possible path of migration from the African continent to the Arabian peninsula instead of through Europe.The signal from the tube is then used to calculate the dose that the material had absorbed.The OSL dosimeter provides a new degree of sensitivity by giving an accurate reading as low as 1 mrem for x-ray and gamma ray photons with energies ranging from 5 ke V to greater than 40 Me V.
It is useful to geologists and archaeologists who want to know when such an event occurred.
Optically-Stimulated Luminescence is a late Quaternary dating technique used to date the last time quartz sediment was exposed to light.
As sediment is transported by wind, water, or ice, it is exposed to sunlight and zeroed of any previous luminescence signal.
Once this sediment is deposited and subsequently buried, it is removed from light and is exposed to low levels of natural radiation in the surrounding sediment.
Through geologic time, quartz minerals accumulate a luminescence signal as ionizing radiation excites electrons within parent nuclei in the crystal lattice.