Preliminary study of window silicate glass powder for EPR dosimetry with 10-MeV electron beam irradiation

Window silicate glass powder has been evaluated as a possible high dose dosimeter using EPR (Electron Paramagnetic Resonance) technique. In this work window glass powder with maximum dimension of 700 μm was irradiated with 10 MeV electrons with doses ranging from 580 Gy to 46.52 kGy. The EPR response of the irradiated samples showed a linear behavior to applied doses up to 8 kGy. The EPR spectra of NBOHC (Non-Bonding Oxygen Hole Center) was found at g1 = 2.0092 ± 0.0001 and g2 = 2.0042 ± 0.0001. The line widths of all spectra were found to be the same. Finally, the thermal fading of EPR intensity was studied for 70 days and showed a sharp decline on the first day. This fading continued up to almost 15 days and then the slope of the decay-curve tended to gradual changes up to 50 days. Afterwards, it presented a fairly constant value with time and a predictable stability was achieved.