Abstract: To overcome the defect of being radioactive operation, CH¹²⁷₃I was tentatively used in iodine absorber performance evaluation. The difficulty for the research is about the analytical method for CH¹²⁷₃I. This paper recommends that CH¹²⁷₃I is analyzed by GC. The results show that the limit deterministic concentration is low, the injected CH¹²⁷₃I is only 2% relative to the designed adsorbed capacity. The imported biggest amount of stable CH¹²⁷₃I will not greatly damage the performance of iodine absorbers to absorb radioactive CH¹³¹₃I in nuclear facilities. It is feasible when CH¹²⁷₃I is absorbed by chromatograph-grade ethanol, then analyzed by GC.

Key words: nuclear ventilation system, iodine absorber, gas-chromatograph analysis, methyl iodide