Adsorption of Fe (III) on XAD-7 from LiCl, NaCl, KCl, RbCl, CsCl, CaCl2and AlCl3solutions was studied. Fe (III) was quantitatively adsorbed on XAD-7 in high chloride concentrations above 6 M. As an application of such adsorption behavior of Fe (III), determination of trace iron usually present as an impurity in reagent grade metal chlorides was examined. After adsorbing Fe (III) from high chloride concentrations on XAD-7, neutron activation was carried out on the resin. Iron amounts of 0.3 ppm, 1.6 ppm and 1.3 ppm were obtained with LiCl, CaCl2⋅2H2Oand AlCl3⋅6H2O, respectively.
A new method has been developed for imaging the thyroid gland by the use of201Tl radioactive implant induced X-ray emission (RIXE) . The thyroid phantom was made from two cylindrical tubes embedded in plastic neck phantom. Each tube consisted of stable iodine and201Tl radioactive source in 10 ml water solution. Some photopeaks in the energy range from 20 to 200 keV were scanned along a horizontal axis by the collimated Ge detector with high energy resolution. The distribution on the horizontal axis was obtained for the generated I Ka-ray and some primary201Tl radiations. The201Tl RIXE scanning can provide information about the distribution of iodine with201Tl as well as201Tl distribution in the thyroid gland. The effectiveness of the201Tl RIXE technique as a thyroid scanning method is discussed.