TL and PTTL of TLD-100 and TLD-700 after irradiation with 14.5 MeV neutrons

In radiation dosimetry, phototransfered thermoluminescence (PTTL) found its use for dose reassessment. After the dose has first been evaluated by a normal thermoluminescence (TL) measurement, the same dosimeter is subjected to the PTTL dose reassessment procedure with the intention of obtaining a new estimation by a completely independent measurement procedure. Recently, some experimental data indicated that PTTL could be used as a tool for dose discrimination in a mixed field using single TL detector. In this work, the short overview of the use of LiF-based TL detectors in mixed field dosimetry is presented. In the experimental part, TL (main dosimetry peak and high-temperature peak (HTP)) and PTTL characteristics for TLD-100 and TLD-700 detectors were investigated for 137Cs gamma rays and neutrons of 14.5 MeV. The results show that it is possible to determine separately gamma and neutron dose components with a single detector due to different sensitivities of TL and subsequent PTTL to neutrons in comparison to gamma rays.