The determination of trace amounts of natural 133Xe in gas under high radon activity concentration levels

Dynamic adsorption of Xe on a fixed-bed adsorber at 77 K

“…Together with the flow rate, gas concentration, fixed packed bed capacity, and adsorbent mass, the dynamic adsorption coefficients allow adsorbed quantities to be calculated, generating information that is important during the design of a fixed bed adsorber. According to the literature, the dynamic adsorption coefficients may be expressed by equations (1)…”

“…and XESPM-II techniques (C. Zhou et al, 2013). The adsorption materials used in these systems include carbon-based molecular sieves, granular-activated carbons, and zeolite molecular sieves.…”

“…Because of their high fission yields, suitable half-lives and low environmental background concentrations, the Xe radionuclides are important with regard to the detection of clandestine nuclear tests as well as in various aspect of radiation safety (C. Zhou et al, 2013). As a result of the typically very low environmental concentrations of these isotopes, they are very difficult to detect unless they are concentrated through separation from other gaseous atmospheric components.…”

“…The most common method of Xe enrichment through separation is physical adsorption, which has been applied in the CTBTO international monitoring systems and on-site inspection processes, including the ARSA (J. I. Zhou et al, 2013). The adsorption materials used in these systems include carbon-based molecular sieves, granular-activated carbons, and zeolite molecular sieves.…”