THERMOLUMINESCENCE AND STORAGE STABILITY OF TLD-100 DOSIMETER IRRADIATED WITH CO-60 GAMMA-RAYS

Thermoluminescence glow curves of TLD-100 revealed three peaks at 373, 460 and 518 K for all samples irradiated with gamma ray doses of 0.5 to 700 Gy. The total thermoluminescence response and the height of the main peak at 460 K showed similar characteristics to radiation dose. On the other hand, the total area under the glow curve increases continuously with radiation dose up to 1000 Gy. All irradiated samples investigated showed no significant fading over 28 d. Activation energy, E, and escape frequency factor, s, for the main glow peak were calculated by the modified empirical equation, as well as by methods depending on the shape of the glow peak. It was found that E has a value of 1.33 to 1.83 eV and s falls between 5.8 x 10(13) and 3.06 x 10(19) sec-1, depending on the method used.