The facility is used to measure concentrations of fission-product xenon nuclides ( 131m Xe, 133m Xe, 133 Xe, and 135 Xe) in the air (the subsoil gas) under field conditions. It is composed of two independently functioning parts—a portable sampler and a unit comprising sample-preparation and measuring modules. A method of low-temperature adsorption on activated charcoal by means of a coolant is used to extract xenon from air streams. To obtain xenon devoid of detectable amounts of radon, gases liberated from the adsorber by thermal desorption are passed through a system of traps. The β-γ coincidence method is used to measure the radionuclide concentrations in xenon samples. When processing air (or subsoil gas) samples with a volume of 6 m 3 and measuring their spectra over 18 h, the minimum detectable concentration of the dominating radionuclide ( 133 Xe) is 0.9 mBq/m 3 . The complex of equipment can be housed in a minivan and is intended to detect radioxenon anomalies at presumed places of clandestine nuclear explosions.
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Prelovskii et al. (2007) studied this question.
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