الفهرس 
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Abstract
Chapter one: this chapter comprises the introduction which contains a brief account on the iodine radioisotopes and application of iodine-131 in nuclear medicine, chemistry and radiochemistry of iodine and tellurium. Production of iodine-131 from fission product and/or neutrons activation of tellurium targets and equations for the calculation of specific activity of iodine-131 from irradiated tellurium target. Separation methods of iodine-131 from irradiated tellurium target, including, dry, melting and/or wet distillation method.
Chapter two: this chapter includes chemical and solutions, apparatus for separation of iodine-131 from irradiated tellurium target based on wet distillation method. Chemical processing including the factors which may affect the separation of iodine-131from tellurite solution such as, kind of acid and concentration, catalyst, type of oxidant and concentration, chemical impurities, carrier gas, order of addition of H2SO4/H2O2 and sulphuric acid filter. Quality control investigations of the product I-131 radionuclide ( including separation factor, recovery yield, radionuclidic, radiochemical, chemical purities and pH-value )
Chapter three: results and discussion. The tellurium dioxide, TeO2 target material with natural isotopic abundance (130Te =33.8%) were irradiated in ETRR-2 Research Reactor-Egypt for 8 h at thermal neutron flux of 1 x 1014 n.cm-2.s-1. thereafter, they were cooled for ≤ 2 d before dissolution in 20% NaOH solution; the obtained Te(IV) solution was submitted to gamma-ray spectrometric analysis. The obtained spectra were identified and quantified according to the characteristic gamma-ray photopeaks of the corresponding radionuclides. The tellurite (IV) solution were radiochemically processed by wet distillation from sulphuric acid media of controlled chemical composition for separation of molecular iodine-131. In preliminary experiments, 1.9 g TeO2 tagged with 0.1 g of the irradiated TeO2 were dissolved in 10 ml 20% NaOH, then 16 ml H2O distilled water was added, followed by carefully adding 12 ml concentrated H2SO4 and 2 ml H2O2 30 % solution to obtain 40 ml Te (VI) solution in 8N H2SO4 acid and boiled. The volatilized molecular iodine was carried out of the still with a flowing air current. Thereafter, the radioiodine gas was passed through 10 ml 0.5N H2SO4 acid filter. Finally, molecular iodine was collected in the form of sodium iodide by passing through two successive receivers containing each 10 ml mixture solution of 0.1 M NaOH + 0.01M Na2S2O3 (9:1 v/v). The distillation time was studied by measurement of the 131I radioactivity in the distillation medium before (i.e., 0.0 time) and after boiling for predetermined time intervals;1,2, and 3 hour.