Effect of thulium on promotion of dose-response behaviour of yttria based rods by Electron Paramagnetic Resonance

Abstract

Radiation dosimetry demands a continuos innovation in materials development. Yttria (Y2O3) exhibits intrinsic lattice features that enable doping with other rare-earth ions, resulting in improvement of its solid state characteristics. This work aims to evaluate thulium (Tm) effect on promotion of dose-response behaviour of yttria (YTm) rods by Electron Paramagnetic Resonance (EPR). YTm rods were irradiated with gamma ( 60Co) doses from 0.001 to 150 kGy and evaluated by EPR, with an X-band EPR, and at room temperature. According to results, YTm rods exhibited a linear dose-response behaviour in a range of dose from 0.001 to 1 kGy. In addition, the fading of EPR signal during 288 h was achieved up to 88 %. These findings indicate that thulium-yttria is a promising material for radiation dosimetry.