Abstract: Application of three methods for performance tests of iodine adsorbers and iodine removal efficiency test of nuclear ventilation systems was studied. Generation rates of methyl iodide, toxicity of reagents and residuals, reliability of test, and stability of equipment were evaluated. Results of this study indicated that the application of dimethyl sulfate method was limited due to its toxicity, trimethyl chlorosilane trimethyl phosphonoacetate method could satisfy the regulatory requirements of nuclear power plants but need to be improved on its corrosion to equipment; while isotope exchange method could be advantageous due to its low toxicity, high generation rate of radioactive methyl iodide, simple and stable operation, and low risk for the application in nuclear power plants.

Key words: iodomethane, dimethyl sulfate, isotope exchange, stability