The suitability of the X-ray microtomographic technique to study the dynamics of vapor adsorption on carbon beds was assessed in this work. This technique was tested using three different systems: CH3I, water vapor and a mixture of water- and organic vapors. Image analysis of the carbon bed cross-sections obtained by X-ray microtomography allows determining the adsorption front progress in the case of organic vapor and mixture of water and organic vapor whereas the existence of this front was not so obvious in the case of water vapor. The tomographic data show flat profile, i.e. a continuous water uptake with time. Experimental results obtained for organic vapors were interpreted on the basis of the Wheeler-Jonas equation: a good agreement was found between experimental and theoretical breakthrough times.