[en] A number of solid reagents have been shown to react spontaneously with radon and xenon at 25⁰C to form nonvolatile compounds. These appear very promising for such purposes as purifying uranium mine atmospheres, reducing emissions of xenon radioisotopes from nuclear power plants and fuel reprocessing plants, detecting failed fuel elements, and analyzing radon and xenon isotopes in air. Radon can be collected with halogen fluoride-metal fluoride complexes, such as ClF₂SbF₆, BrF₂SbF₆, BrF₄Sb₂F₁₁, and IF₄(SbF₆)₃; with the dioxygenyl salt O₂SbF₆; and with the fluoronitrogen salts N₂SbF₆ and N₂F₃Sb₂F₁₁. Xenon can also be collected with O₂SbF₆ and N₂FSbF₆. All of these compounds are decomposed by water vapor; therefore, they must be used in conjunction with desiccants, such as Drierite, silica gel, or molecular sieve. Methods of preparation of the compounds and reactions of the compounds with radon and xenon are described. Chemical separations of krypton and xenon and laboratory-scale decontamination experiments with samples of air containing radon-222 and xenon-133 are also described. The possibility of finding solid oxidants for krypton (antimony salts, for example, that would be capable of forming the complex KrF⁺Sb₂F₁₁^-, and liquid oxidants for radon, xenon, and krypton that would be suitable for use in spray towers) are discussed