A new absorption-catalytic method of sample preparation for AMS 14C analysis has been designed. The semi-automatic graphitization equipment consists of catalytic combustion, selective absorption/desorption of CO2 and graphitization zones. Sample combustion followed by CO2 separation takes less than 30 min that allows plenty of samples to be processed in a short time. The average CO2 conversion to graphite turned out to be 75%. Achieved value of background induced by contamination with contemporary carbon is about 1.2 pMC. The proposed method is reproducible according to results for the OX-I and OX-II oxalic acid standards measured from 2015 to 2018 and has been successfully used for dating lake sediments. The results agree with the data of other laboratories. The penetration of model aerosol particles inhaled at low dose by mice has been studied by means of the designed method.