Advanced Physics for Brachytherapy 2018

TLD: influence factors

• TLD response is not significantly affected from environmental conditions (normal room temperatures, moderate exposure to light). BUT Traps are not stable @ room temperatures and annealing @ 400 0 C for 1 h is required to ensure trap stability. Fading can affect low T peaks. This can be mitigated by eliminating corresponding traps (annealing @ 80 0 C for 24 h pre-irradiation) or emptying them before readout (annealing @ 100 0 C for 2 h pre-irradiation and 10 min post-irradiation)

• background correction is necessary for PM dark current and TL non-related to D (the latter is reduced with N 2 gas purging during readout)

• TLD response is dose rate independent