Solid state thermoluminescent dosimetry

My research in the solid state thermoluminescent (TL) dosimetry developed along the following directions:

• In [B7] we proposed a theoretical model describing a heating contact between a heating element and a detector (a tablet of a sample crystal (LiF:Mg,Ti) or a pressed powder of it). The theory was carefully checked experimentally, giving reliable predictions for shifts of the TL curves with respect to changes of a contact "resistance".
• In [B13, B17, B20] the effect of heating conductivity has been applied to measure the beta radiation absorption dose, and detectors with strong dependence of their TL peak positions on the dose have been elaborated and described in [B17]. In [B24] we proposed to use usual TL detectors supplied with filters of different thicknesses to be put on them in a cassette. As a result, a set of different distributions of the absorbed dose in the detectors was obtained which made it possible to calculate the expected doses in mixed beta-gamma radiation fields. Both methods have been extensively tested experimentally.
• The case of the so-called 2nd-order TL kinetics has been studied in [B16, B22]. In [B23, B34] we demonstrated the general method of solving a continuous distribution problem when trap centres in a sample have a continuous distribution of activation energies, capture constants, etc. Usually considered models of samples with a set of discrete electronic levels in a gap represent a particular case. We have shown that in the very general case this problem can be converted into a set of two integral equations containing the continuous distribution functions for electron and hole centres. An appropriate numerical algorithm has been elaborated to calculate the TL curves [B34]. The results obtained demonstrate the correct trends and behaviour of the TL signal with changing of dose, heating rate and parameters of the model. The theory opens up a possibility to formulate and solve correctly the so-called inverse problem, i.e. how the microscopic model of a process can be extracted from experimental TL curves.
• Another model of the kinetic processes in crystals based on the so-called hopping mechanism has been investigated in [B31], where finite jumps of the defect species A toward another species B (which is fixed in space) with subsequent tunnel recombination have been studied.
• Finally, I have participated in the creation of a data-base system for needs of the personal and environmental dosimetry which included the software development work.