Phototransferred Thermoluminescence from Obsidian Using Ultraviolet Radiation

Abstract

The behavior of TL and PTTL under UV stimulation in gamma-irradiated obsidian was investigated. The noticeable change of the shape of the main TL peak after thermal or optical stimulation clearly shows that this peak is related to at least two traps. The PTTL curves recorded after preheating up to a given increased end temperatures are described by two processes. The first one is associated to the decay of the traps responsible for the main TL peak. The second is related with the phototransfer from the deep to the main trap. Fading studies over a period of 14 days show that the PTTL faded by 5% when exposed to 50Gy.The results further predict the potential of obsidian as a phosphor in TL dating, accident and industrial dosimetry.

Keywords: Obsidian, Phototransfer, Phosphor, Fading.