About nonlinear response of SS/EPR dosimetry in high dose region (20–80 kGy)

Abstract

It has been study the EPR dose-response curve of gamma irradiated alanine and sucrose dosimeters. It is well known that the EPR signals increased linear with the absorbed dose radiation for low radiation doses and begins “saturation” at higher doses. In the present study some investigations about the problems of the nonlinear response of cylindrical alanine or sugar solid state /Electron Paramagnetic Resonance (SS/EPR) dosimeters in high dose region (20–80 kGy) are presented. It has been supposed that in result of gamma irradiation dielectric losses in radiation sensitive materials increase with the dose and thus EPR response decrease. This effect can be avoided with so called “self-calibrated” EPR dosimeters. In them in addition to radiation sensitive and binding materials an “internal” standard which is not dependent on the radiation, is added and the dose estimation is calculated via the standard. In the “self-calibrated” dosimeters because this effect is applied both on the radiation sensitive material and the standard, is provided linear dose response in wide dose region (1–80 kGy).