Dry distillation absorber for I-131 production

Abstract

The invention discloses a dry distillation absorber for I-131 production. The dry distillation absorber comprises a vertical absorption trough and a horizontal distillation tube, wherein the absorption trough comprises an alkaline liquid tank, a water bath tank and a coiled tube, and one end of the distillation tube is flared. The other end of the distillation tube is fixedly connected with the side wall of the alkaline liquid tank through a sleeve, the water bath tank is placed into the alkaline liquid tank, and the coiled tube is placed into the water bath tank. A pipeline at the upper end of the coiled tube sequentially penetrates the water bath tank, the alkaline liquid tank and the sleeve in an obliquely upward manner, enters the distillation tube and is hermetically and fixedly connected with the water bath tank, the alkaline liquid tank and the distillation tube, and an included angle is formed between the pipeline at the upper end of the coiled tube and a horizontal line. A pipeline at the lower end of the coiled tube vertically goes through the bottom center of the water bath tank and is hermetically and fixedly connected with the water bath tank. The dry distillation absorber can distill and rapidly trap high-temperature I-131 steam distilled off by reactor TeO2, and Na131I production efficiency and safety can be more effectively improved.

Description

technical field [0001] The invention belongs to the technical field of radioisotope preparation, and in particular relates to a dry distillation absorber for I-131 production. Background technique [0002] Na used in the production of radiopharmaceuticals 131 The raw material of I is mainly TeO after irradiation by high temperature (about 750°C) dry distillation reactor. 2 (Tellurium dioxide) and prepared by absorbing the radioactive I(iodine)-131 vapor in the carrier gas with dilute lye (generally NaOH solution with a concentration less than 0.5mol / L). The Institute of Nuclear Physics and Chemistry of the China Academy of Engineering Physics, as well as the domestic China Institute of Atomic Energy and China Nuclear Power Research Institute, have all worked in their Na 131 In the production process, the vacuum pump is used to pump air, and the high-temperature carrier gas in the distillation furnace is directly introduced into the bottom of the absorption bottle for bubbl...

AI Technical Summary

Problems solved by technology

Moreover, the distillation tube and the absorber of the prior art are split, connected by a plastic tube or a rubber tube, and the strong gamma radiation and high temperature of the radioactive iodine-131 in the carrier gas have a greater impact on the service life of the connecting tube. It is prone to aging and cracking in the medium, resulting in the leakage of radioactive iodine-131 vapor, which shortens the service life and increases the risk of more radiation doses for production equipment maintenance and repair personnel, which is not conducive to safe production

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