The aim of this study is to develop a new technique for reducing high radon level in indoor air bymethod of membrane permeation using a hollow fiber module. The experiment has been carried outfor MERASILOX-S module of fine hollow fibers of silicon rubber that has high permeability constantand MHF hollow fiber module made of thin segment polyurethane membrane. The radon permeabilityconstants of hollow fiber membranes have been estimated from the decrease rate of radonconcentration in a radon permeation system.
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