@misc{oai:repo.qst.go.jp:00071241,
 author = {Miroslaw, JANIK and Ishikawa, Tetsuo and Yonehara, Hidenori and ミロソラフ ヤニック and 石川 徹夫 and 米原 英典},
 month = {Sep},
 note = {The new system for measurement of radon diffusion constant in membranes (RADIF) is established at the National Institute of Radiological Sciences (NIRS), Japan.
The RADIF system consists of several components: two AB-5 radiation monitors (uses proven photomultiplier tube (PMT) technology) connected to source and receiver chambers, with volume of 30 and 100 dm3, respectively, ceramic radon source and AlphaGUARD device for radon monitoring outside chambers as well as environmental parameters registration.
The permeability of membranes is measured according to the ISO norm and method entitled "Determining the radon diffusion coefficient under stationary conditions established during ventilation of the receiver container" (ISO/WD 11665-10). 
Under this condition the radon concentration in the source container is stable whereas the radon increases in the receiver container. Finally, the permeability (diffusion coefficient) of the investigated membrane is derived using one-dimensional stationary radon diffusion described by the differential equation.
Moreover, due to relatively large volumes of both containers (source and receiver) the investigation of diffusion process in relation to changeability of environmental parameters (humidity and temperature) is also possible., 7th International Conference on Protection Against Radon at Home and at Work},
 title = {RADIF- NIRS System for Measurement of Radon Diffusion in Membranes},
 year = {2013}
}