Browsing IV. Eurasian conference on nuclear science and its application : presentations, 31 October- 3 November 2006. Baku, Azerbaijan. by All Authors "57534"
(Azerbaijan National Academy of Sciences Institute of Radiation Problems ve Turkish Atomic Energy Authority, 2006) Koşal, M.; Atlıhan, M. A.; Meriç, N.; 57534; Bölüm Yok
Atoms and molecules receiving energy from surroundings will be unstable. When these atoms and molecules are stimulated, they return to the ground state. During this process light is emitted from them. This phenomenon is called luminescence. Luminescence resulted from light stimulation is called optically stimulated luminescence (OSL).
Energy is absorbed by a sample from flux of radiation is proportional to luminescence quantity occurring result of stimulation. The absorbed radiation energy is called equivalent dose. The quantity of luminescence due to equivalent dose is known as natural OSL.
There are several techniques to evaluate the equivalent dose. Principally, in evaluating the equivalent dose, the natural OSL from sample is compared with OSL of same or similar sample that is irradiated with a calibrated radioisotope source.
The equivalent dose may be used in dating in archaeological and geological materials. It can be determined that age of historical ruins or occurrence time of still appearing trace of important natural events by dating. In this dating method, our aim is to determine the last time when the material was exposed to light. Optically stimulated luminescence methods have used for dating in archeological and geological samples since 1980’s. The basic process is measurement of natural (absorbed dose in buried duration) and annual (absorbed dose in buried in a year) dose of sample for dating. That is, annual dose represents yearly dose rate is absorbed from the flux of nuclear radiation provided thorium-232, uranium-238 and potassium-40 in material as well as by cosmic rays. Besides annual dose is assumed to be constant. It can be determined by measuring amount of radioactive elements in sample. The age can be calculated from the ratio of natural dose to annual dose.
In this study, the potential of OSL for determination of equivalent dose in archaeological sherds from Turkey (Aksaray, Eskil) was investigated.