Application of individually calibrated solid LiF:Mg,Ti (MTS-N) detectors in clinical dosimetry

The applicability of individually calibrated solid LiF:Mg,Ti detectors (MTS-N, Institute of Nuclear Physics, Krakow, Poland) in clinical dosimetry was investigated. By attending to repeatability and stability of annealing and readout parameters, it was possible to select from a group of about 100 MTS detectors calibrated in external Co-60 Or 9 MV photon beams a subgroup of at least 70% of these detectors whose individual response factors (IRFs) did not vary by more than 2.5% (SD) from the mean value over six cycles of annealing 1 Gy exposure and readout. A 3-step readout of detectors was found to be at least as accurate and more convenient than linear readout. MTS-N detectors were applied in in vivo dosemeter assemblies and in intercalibration measurements of Co-60 beams.