|発明の名称||METHOD FOR PRODUCING [11C]CH3X|
PROBLEM TO BE SOLVED: To provide a method for producing 11CH3I, which is promising in the capability of realizing high-ratio radioactivation and can keep high yields.
SOLUTION: In a method comprising directly converting 11C formed by irradiating a nitrogen gas containing a hydrogen gas with protons into [11C] CH4 in an irradiator and reacting it with a halogen gas in a reaction tube to form 11CH3X (wherein X is a halogen atom), the irradiation is performed after removing contaminant non-radioactive carbon by pre-irradiating the atmosphere in the irradiator with protons, and the 11CH3X and the halogen gas are passed through the reaction tube by a single-pass method in which they are not recirculated through the reaction tube. The optimal conditions therefor are also provided.
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