A complex of equipment was designed for taking xenon samples from the ambient air, measuring concentrations of radioactive xenon isotopes ( 131 m Xe, 133 m Xe, 133 Xe, and 135 Xe), and transmitting results in the automatic mode. Xenon is extracted from the air stream using low-temperature adsorption on activated charcoal. Radiochemical purification of the adsorbed xenon is based on thermal desorption in a helium stream and the passage of gases liberated by the adsorber through a system of traps. The radionuclide concentrations in xenon samples are determined using the βγ coincidence method. When processing air samples of volume 12 m 3 and measuring their spectra over 10 h, the minimum detectable concentration of the prevailing radionuclide ( 133 Xe) in the air is no greater than 0.5 mBq/m 3 . The complex is designed for radiation monitoring under the Comprehensive Test Ban Treaty.

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