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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) 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.

neutron dosimetry; mixed field dosimetry; thermoluminescence dosimeters; PTTL; TLD-100; TLD-700

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