The diffusion of 222Rn through different types of membrane has been studied using
activated charcoal technique. The permeability constant and the relative radon permeability
for 16 different types of materials (aluminized polymers, polymers, papers, glass) have been
measured. The results are in good agreement with previously reported data for a similar
membrane. The effect of membrane thickness on the permeability constant of Bisphenol-A
polycarbonate and Polyethylene has been discussed.