Stability study of free radicals in 10 MeV electron beam irradiated quartz as an EPR dosimetry method

Many properties of a material, such as physical shape, crystalline or amorphous form, and particle size, may affect the quality of EPR response. The effects of mechanical treatment to a material such as grinding, crushing, and particle size on EPR signal were reported earlier [1, 9]. The EPR technique is a well known and well established method for dose measurement in several fields like radiation processing and retrospective dosimetry [8–13]. Many different materials such as alanine [5, 7, 12, 14], tooth enamel, and bone [2, 6, 12, 13, 15] have been extensively studied for their applications in radiation dosimetry using the EPR technique. It is also reported that the quartz materials have shown a good response to gamma rays in the dose ranges used for radiation processing and retrospective dosimetry, using the EPR techniques [8, 9]. These reasons plus the non-destructive nature of the radiation-induced defects when using the EPR technique, suggest that quartz could be a possible candidate for dose measurements in radiation processing and retrospective dosimetry. The main purpose of this study was to investigate the stability of the EPR response of quartz irradiated at different doses and dose rates with a 10 MeV electron beam. Stability study of free radicals in 10 MeV electron beam irradiated quartz as an EPR dosimetry method Farhood Ziaie, Ahmad Mohammadzadeh, Mohammad Modarresi