Chemical dosimeters for electron beam dosimetry of microtron accelerator

Abstract

The variable energy microtron at Mangalore University has been used to study the effect of radiation on different materials and biological systems. While studying the effects of radiation, it is essential to have complete knowledge of absorbed dose. In the present study the dose due to 8 MeV electron beam from microtron accelerator has been calculated using chemical dosimeters. The uniformity of dose distribution at various points of the irradiation area also has been calibrated. From the dosimetry studies it is observed that there is a linear relation between dose and electron numbers over a wide range of absorbed doses. It is evaluated that the electron counts of about 1.15 9 10 14 corresponds to an absorbed dose of 100 Gy and a field size of about 4 9 4 cm is available at 30 cm distance from the beam exit window over which the dose distribution is uniform.

Relative Biological Effectiveness Studies Using 3 MeV Proton Beam from Folded Tandem Ion Accelerator: An Experimental and Theoretical Approach

“…Cell Inactivation Studies: The survival response of Saccharomyces cerevisiae D7 strain after irradiation with proton and gamma radiation is presented in Figure 2.It is clear from Figure 3 that dose response with proton beam is linear, whereas with gamma radiation it is sigmoid. The sigmoid dose response is due to the multi-track hit processes combined with dose rate dependent molecular repair processes [9][10][11]. The linear dose-response is due to the lethal damage which leads to cell death even at lower doses.…”