Radioisotopes have found wide use in chemistry because of their distinctive qualities. The case with which a radioisotope is detected and the precision, with which it can be measured, even in minute quantities, leads to not only its use as analytical tool of great versatility but the phenomenon like co-precipitation, solvent extraction, chromatographic and ion exchange methods, surface absorption, mechanism of inorganic and organic reactions, structural confirmations, all can be investigated. At present there are up to 200 radioisotopes used on a regular basis, and most must be produced...