Due to an increasing risk of terroristic attacks or nuclear accidents potentially some of populations can be exposed to dangerous doses of ionizing radiation. In such cases it is needed to develop an effective method for triage so the individuals with significant risk can be treated immediately with proper medical procedures. The fact that EPR can measure absorbed doses was first reported by Brady et al. in 1968. Nowadays ongoing works on such system which can measure in vivo doses absorbed in human teeth give an opportunity for a quite good estimation. Also results of research on fingernails and teeth ‘biopsies’ using EPR system are forecasting well. Getting smaller detecting system size and solving many technical issues can be made in the next few years which can make EPR technique a great tool for a retrospective dosimetry in case of an emergency and health risk.