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Abstract
Since 1962 a Radioisotopes Methodology Course is given annually at the School of Pharmacy and Biochemistry, Buenos Aires University, Argentina, where usually professionals of the biomedical area assists. The current program has 222 hours of training: 122 hours devoted to theoretical aspects and 100 hours to intensive practical work. The training in radioprotection include subjects as: definitions, dosimetrical magnitudes and units, dose rate, equivalent dose, effective dose, exposition, dosimetry of internal and external sources, shielding, classification of working conditions and areas, transportation of radioactive materials, instrumentation associated to radioprotection and many application excersises. A total of 1085 professionals have passed their examination. Percentage distribution according to different professions can be resumed as follows: 16.1 physicians, 65.1 biochemists, 0.7 engineers, 2.0 biologist and 16.1 from others professions such pharmacists, etc. The training in radioprotection throughout the whole program is oriented to consolidate the general knowledge on the subject, independently from the previous universitary formation. We stress also the importance and differentiate the applications to biochemistry, principally those concerning the use of 125-I, as well as to nuclear medicine fundamentally through the utilisation of 99m-Tc generators.
Abstract
A photocolorimetric microtechnique is described, by which it is possible to determine the real amount of iodine in carrier-free solutions of131INa. The method is conceptually based on the well-known effect of iodine, by which the rate of reduction of ceric sulfate by arsenious acid in sulfuric acid solutions is proportional to the iodide concentration. The tittration and the preparation of its corresponding calibration graph require approximately 90 min; thus, it seems possible to use this technique as a routine analysis. Under the stated conditions of temperature and reaction time, it is possible to determine samples of iodine with concentrations ranging between 20 and 160 ng/ml. The standard error between different determinations is less than ±5%. The application of the method in production control and utilization of carrier-free131I solutions, free from reducing agent, are discussed.
Abstract
A methodology of comparison is presented as a way to determine the origin of ceramic fragments proceeding from clays and archaeological sites of the 9th Region of Chile, analyzed through X-ray fluorescence (XRF) spectroscopy. Net areas of peak of sample spectra, are analysed using the graphic polygonal method, developed previously.1,2 Criterions of comparison have been defined as a way to determine similarity degrees and proceeding places. Polygonal representations used are triangles, squares, pentagons and hexagons; the similarity grading among samples is defined. Results are compared with clay samples and sand removing effects on fragments are also defined.
