Variability of parameters in retrospective EPR dosimetry with teeth for Ukrainian population

Variability of EPR signal parameters in retrospective dosimetry with teeth has been studied among five different oblasts (regions) of Ukraine. It was found that the native signal in enamel is region-invariant and has peak-to-peak width of 0.85±0.01 mT and intensity of 1.0±0.20 normalized units. Low-frequency background signals in the spectra of enamel,1 expressed in terms of dose were estimated to represent 15–20 mGy. Variability of radiation sensitivity among different teeth (inter-sample variability measured using 100 mg aliquots) was ±4% while among different parts of one tooth (intra-sample variability measured using 5–10 mg aliquots)—±7%.