EPR dosimetry of tooth enamel: isolation of radiation-induced signal in the EPR spectrum of the enamel with the use of model with allowance for the relationship between shape of spectrum components and microwave power
For the purpose of search of optimum algorithm of mathematical processing of the EPR spectra of irradiated tooth enamel the analysis of efficiency of usage of the analytical model considering change of the form a component of the EPR spectrum at various microwave power is made for definition of the absorbed dose on amplitude of the radiation-induced signal. EPR spectra irradiated with gamma rays in various doses of homogeneous samples of enamel (a mix of enamel from a several teeth), measured at various microwave power, have been processed with model use in which the parameters describing the form a component, established according to preliminary measured dependences on microwave power. Accuracy of mathematical processing estimated on a root-mean-square deviation of certain values of a dose from rating values. It is shown that use of the this model allows to increase accuracy of dose determination in comparison with earlier used model in which the form of the radiation-induced signal was fixed without power dependence, and the form native (background) signal varied in the course of model fitting to an experimental spectrum.