Preparation method of radioactive methyl iodide

Abstract

The invention belongs to the field of a nuclear air cleaning technology and relates to a novel preparation method of radioactive methyl iodide for detecting active carbon performances and iodine absorber efficiency of a nuclear air cleaning system. The preparation method utilizes an alcohol-water mixed solution of nonradioactive iodomethane as a reagent and comprises the following steps of mixing a prepared nonradioactive iodomethane reactive liquid and a radioactive sodium iodide solution to obtain a radioactive methyl iodide generation liquid, standing the generation liquid for some time so that iodine isotopic exchange is finished and radioactive iodomethane is obtained, putting the radioactive iodomethane generation liquid into a methyl iodide generator, carrying out radioactive iodomethane generation, and injecting the product into a test loop for detecting iodine absorber efficiency. The preparation method prevents a risk caused by use and operation of a large amount of dimethyl sulphate as a highly toxic product, reduces radioactive methyl iodide generator pipe corrosion caused by a test reagent and instability of generator operation caused by corrosion, reduces maintenance frequency of the methyl iodide generator and prolongs a service life of the methyl iodide generator.

Description

technical field [0001] The invention belongs to nuclear air purification technology, and in particular relates to a new method for preparing radioactive methyl iodide which can be used for checking the performance of activated carbon in a nuclear air purification system and the efficiency of an iodine adsorber. Background technique [0002] In the nuclear field, the nuclear air purification system is a very important radiation protection measure for the normal operation, accidental operation or decommissioning of nuclear facilities. It can protect the occupational personnel, the public and the environment from a large degree of radiation hazards. An important component in the nuclear air purification system is the iodine adsorber, which can absorb and retain the radioactive iodine in the air or process gas in the activated carbon inside it, so as to avoid the radiation hazard caused by it. In order to ensure the reliability of the operation of the iodine adsorber system in n...

AI Technical Summary

Problems solved by technology

Dimethyl sulfate, the reagent used in the radioactive methyl iodide method, is highly toxic, and its toxicity is similar to that of mustard gas. The safety and environmental protection requirements during transportation, storage and use are very high, and it has high experimental risks.