Abstract
ABSTRACT This paper describes the optimal conditions of temperature, reaction rate, drying and sintering to obtain high purity TeO2 crystals where the retention of I-131 produced by Te-131 radioactive decay is efficient. The chemical reaction used is oxidation of metallic Te with concentrated HNO3 in presence of an airflow with heat applied to the reaction chamber. After drying and purifying by further healing, TeO2 is sintered, i.e., is heated to its melting point and held for a few minutes. This creates cavities inside the crystalline structure, where gaseous I-131 produced by Te-131 radioactive decay must be adsorbed, after the sintered TeO2 has been bombarded with thermal neutrons in a nuclear reactor. The general procedure of I-131 production is also described. This includes melting of radioactive sintered TeO2 in a hermetic box, pumping out and retention of I-131 in an alkaline solution keeping the necessary safety conditions
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