Sodium Hydrogen Oxalate and the Gum Arabic: An Electron Spin Resonance Dosimetry Study

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Ghada Faisal Mirghani, Ali
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In this research work we consider the applications of Electron SpinResonance [ESR] technique to radiation dosimetry. Two samples have been selected for this purpose. The sodium hydrogen oxalate single crystals and the gum Arabic. The sodium hydrogen oxalate has been chosen to investigate the effect of the microwave power dependency of the ESR line. Both at low temperature [77K] and at low modulation frequency [1.56KHz]. The study showed that, the ESR signal intensity depends essentially on the microwave power. The microwave power saturation curves were constructed at 77K temperature and at 1.56 KHz. The result showed that maximum ESR signal intensity was achieved at 0.16 mW at 77K, where as it is valueof 0.81 mW at 1.56 KHz modulation frequency. This revealed that a correlation to the ESR signal must be done in order that the signal intensity should be considered for absorbed dose radiation measurements. The relative spin concentrations were obtained, also the corresponding percentage ratios were calculated, these were 21%, 39%, 63% and 83% for the spectra recorded at 77K. The ratios obtained for the spectra at 1.56 KHz were 41%, 51%, 62%, 74%,81% and 91%. The ESR signal intensity of the gum Arabic was plotted at different periods of radiation time. Numbers of relations between the intensity and the radiation time were proposed to fit the data. A linear relation was suited well. Based on the data and the fitting parameters we suggested a relation between the intensity and the time of radiation. The relative spin concentration for the gum Arabic were found to be 0.27%, 0.8% and 27% respectively. These results suggest that the gum arabic can be used as a suitable ESR dosimeter
Sodium,Hydrogen,Oxalate,Gum Arabic