ЭПР-исследование кинетики распада свободных радикалов облученной сахарозы

Abstract

Electron paramagnetic resonance (EPR) spectrometry makes it possible to study the formation of free radicals during the transfer of energy to the object. The decay kinetics of free radicals is an integral part of the study since this phenomenon directly interferes with the goals of accurate identification of the irradiation fact and dosimetry using EPR spectrometry. In this work, we have studied the time dependence of the intensity and characteristics of the EPR signal of analytical sucrose irradiated with gamma rays at doses from 0.3 to 9 kGy. It has been shown that irradiated sucrose gives a stable EPR peak after 60 days. A change in the spectral characteristics of the signal was recorded in the first 23 hours after irradiation. The signal intensity tends to increase in the first 72 hours after irradiation for a sample with an irradiation dose of 300 Gy and 48 hours for 1000 Gy. The dependence of the signal intensity on the absorbed dose is linear in the range of studied doses. The g-factor value at the intersection point of the derivative contour with the zero line is 2.013. Based on the data obtained, it can be assumed that sucrose (sugar) is one of the best candidates among solid radiation-sensitive materials for identifying the fact of irradiation using EPR spectrometry