A method for purifying a crude acetone raw material containing low molecular weight impurities using three columns in sequence is disclosed. Upon administration, the propellant are evaporated from the mixture and the lipid crystals are deposited upon the airliquid interface resident upon epithelial tissue lining air ways and air spaces of said upper respiratory system. When a user inhales on the mouthpiece, the dose is entrained in an airflow and flows out of the blister through the mouthpiece and into the user’s airway. The detection system comprises an image sensor which is stationary with respect to the scanning and which is dimensioned so as to be able to acquire an image of the surface to be imaged by the X-ray radiation from the portion. The inlet header has a lateral dimension less then the lateral dimension of the heat exchange tube.