Abstract
The purpose of this work was obtaining information about the interaction of γ- ray with CR-39 track detector by using the UV-Vis spectrometry and FTIR which can be used in concerning sensor for gamma irradiation. CR-39 samples irradiated by radioactive source Co-60 at different doses are (0, 100, 200, 300, 400, and 500 kGy). The UV-Vis spectroscopy show transitions electronic in the visible region from ground state to excited state, by increasing gamma doses, and the absorbance spectrum for all samples take the same behavior with slightly shift. This shift due to decrease in the optical band gap energy E<sub>g</sub>. The FTIR spectra show for all samples there are increases in the intensity of the characteristic peaks with increasing gamma ray, at 3234, 2367 and 1817 cm<sup>-1</sup>, this increase may be related to more oxidation process that, in turn was produced on the polymer chains by increase gamma doses, and the number of peaks at 1817, 2367, 2645 and 3234 cm<sup>-1</sup> is belong to carbonate group C=O stretching vibration, O=C=O asymmetric by stretching, C-H Stretching, H<sub>2</sub>O free stretching vibration, respectively. By increase gamma ray did not observed changes in the CR-39 groups but observed change in the intensities of peaks, then CR-39 detector can be used properly in the field of radiation dosimetery.
Highlights
Solid state nuclear track detector CR-39 has a chemical formula (C12H18O7) and it advantages by perfect structural stability and it has high resistance to most of the solvent, chemicals and different environmental factors
The poly-ally chain connected by di-ethylene glycol dicarbonate link form structure for CR-39 polymer
This structure containing three main functional groups: ally group, carbonyl group and ether group, which are responsible for the improvements in physicochemical properties after radiation exposure, so the presence of allyl group in the CR-39 structure makes it more sensitive for any type of radiation [2,3,4,5,6,7,8,9]
Summary
Solid state nuclear track detector CR-39 has a chemical formula (C12H18O7) and it advantages by perfect structural stability and it has high resistance to most of the solvent, chemicals and different environmental factors. CR-39 is clear in the visible range and almost entirely no transparent in the electromagnetic range [1] It has the track registration property because of high detection efficiency, high sensitivity, and short etching time. CR-39 plastic detector is one of the most commonly used for radiation detection, because its high sensitivity to protons and alpha particles These particles do not caused tracks but can make weighty and sometimes intense effect on the properties of track [3,4]. The primary configuration of solid-state nuclear track detectors (SSNTD) Such as CR-39 polymer destroys by the interaction of radiation with it, as well as heavy chemical variations take place in polymers under the effect of ionizing radiations (Xrays, gamma rays, fast and slow neutrons, fast electrons, alpha particles, protons, and other products of nuclear reactions) [5]. The target of the present work is to produce the response of CR-39 polymer to different gamma doses from (0 – 500 kGy), and study the optical and chemical properties of CR-39 polymer under these gamma doses
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