Recovery of thermoluminescence sensitivity in CaF2:Mn (TLD-400) dosimeter under heating process

In order to recovery the thermoluminescence (TL) sensitivity of CaF2:Mn (TLD-400) thermoluminescent dosimeter it was exposed to high gamma radiation dose of 10kGy, then by applying standard annealing followed by irradiation to 1Gy gamma dose, the TL signal was recorded . The TL response reduced due to the damage effect of high dose irradiation in comparison with control dosimeter with received dose of 1Gy. By applying different thermal treatment and variation of annealing time, the appropriate annealing time for recovery of sensitivity was determined.