The analyzer was calibrated using a gas mixture generator Mikrogas-F (Russia), which generated a flow of benzene vapors within a concentration range of 14–1700 mg/m3. The calibration curves for all the studied lamps depicted in Fig. 3 well agree with the results of determination of the differential absorption cross section by magnetic scanning (Fig. 2). As follows from Fig. 2 and Fig. 3, the lamp with the 204Hg isotope provides the highest sensitivity as compared with all other lamps.