Spectrochemical Analysis of Radioactive Solutions (original) (raw)
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Several mdiochemieal separations have been employed at the Radiochemistry Division of the Institute of Nuclear and Energy Research -Brazilian Nuclear Energy Commission, for the analysis of a number of elements in different kinds of matrices. In the present paper some of these separations applied to the analysis of geological samples, geological and biological reference materials and Brazilian foodstuffs are described. The separation procedures utilized are mainly ion exchange, retention in inorganic exchangers like HAP, TDO and HMD and solvent extraction.
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When Periodic Chart of elements is consulted to find natural radioisotopes, one firstly finds tritium, followed by 10 Be, 14 C, 50 V and many others. Before Bi, 12 cosmogenic radioisotopes are listed. They are those continuously produced by nuclear reactions among light elements present in earthly atmosphere and radiations coming from the outside space. Eighteen additional primordial radioisotopes are listed. They were created at the same time that the non-radioactive isotopes composing the 92 natural elements in the periodic table. From Bi on, every isotope is radioactive, up to U. Then follow the artificial elements produced by laboratory nuclear reactions from Np to element with atomic number 118. In this way, from 118 known elements, 64 are radioactive, which amount 55% of all those units forming the chemical compounds. Therefore, the complete understanding of radioactivity should be a suitable tool to advance our knowledge of Universe, and consequent applications to get better living conditions. So, this paper deals with radioisotopes as suitable instruments for chemical analysis.
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