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Description
Electron paramagnetic resonance (EPR) is a highly sensitive technique used in retrospective dosimetry for dose assessment after radiation exposure, particularly in radiological and nuclear emergency scenarios. Tooth enamel is considered the most suitable human tissue for EPR-based dose reconstruction due to its high radiation sensitivity and long-term signal stability. However, the EPR spectrum of enamel contains, besides the radiation-induced signal, a complex superposition of background components that significantly contribute to dose uncertainty and limit the minimum detectable dose.
This work focuses on improving the understanding of the EPR spectrum of tooth enamel in order to enhance the accuracy and sensitivity of retrospective dose estimation. Measurements were performed at Q-band frequency and combined with sample annealing, numerical simulations, and spectral data analysis together with complementary experimental methods. The study aims to identify and separate individual spectral components affecting dose evaluation. The results indicate that low-temperature measurements improve spectral resolution and signal discrimination, leading to reduced uncertainty and improved detection limits. These findings demonstrate a promising approach for further enhancement of EPR enamel dosimetry in emergency and retrospective applications.