[en] Experimental measurements have been made on the breakthrough behaviour of (non-radioactive) methyl iodide in a fixed bed of activated charcoal. The system is of interest since radioactive methyl iodide is present in the circulating gas in a nuclear reactor and charcoal beds are installed to adsorb volatile radioactive compounds in case the circulating gas has to be released to the atmosphere in an emergency. A mathematical model has been developed which, using the parameters obtained in the preceding paper, gives a good prediction of the breakthrough curves for particle sizes up to 8.6 x 10^-4m. Theory and experiment can be reconciled for larger particle sizes by allowing for their lack of sphericity through a shape factor. (author)