Measurements of Some Physical Properties for Solid State Radiation Detectors

Abstract

Polymers have emerged as the most promising materials in the modern era by virtue of their outstanding inherent properties with a possibility to modify these to the desired extent through various means like chemical doping, irradiation, and implantation. It is well documented that the polymers with the improved properties find extensive applications in various fields such as electronic and opto-electronic devices (solar cells, LEDs, LCDs, optical switches, optical waveguides etc), automobile parts, aerospace technologies, and medical applications. Gamma irradiation attracts special attention in improving the bulk properties of the polymers. Irradiation induces bond breaking, main chain scission, creation of unsaturated bonds, intermolecular cross linking, radical formation and loss of volatile fragments. All these processes are responsible for the modification of structural, electrical, optical and surface properties of polymers leading to their applications in different scientific and technological fields. It is obvious from literature survey that a systematic study of the effects of irradiation on the properties of polymeric Abstract XIV materials is needed to check the role of radiation agents in the modification process. At the same time, the actual physico-chemical changes taking place inside the polymers are yet to be ascertained with specific and definite accuracy by using different techniques. The aim of this research work is to study the effects of gamma rays irradiation with a wide range of doses on structural, optical, electrical and Surface wettability properties of two polymers belong to polycarbonate (PC) polymers, and for further exploring their applications in different fields. The polymers namely Bayfol CR 1-4 and Makrofol DE 7-2 were selected and irradiated with different doses of gamma rays from 20 up to 1000 kGy. The UV–Vis spectra of irradiated samples show that the absorption edge is shifted towards longer wavelength comparing to pristine sample spectrum for both polymers. This behavior indicates that there is a decrease in the band gap after irradiation. The XRD patterns of amorphous halo of pristine and irradiated samples show a fluctuation of integrated intensity of amorphous halo for Bayfol polymer, the same trend is happen in sharp peaks of pristine and irradiated samples of crystalline Makrofol polymer. This indicates a change in the