5[11]Shimo MA.Flow-Type Ionization Chamber for Measuring Radon Concentration in the Atmospheric Air,in Atmospheric Radon Familiers and Environmental Radioactivity.Okada S ed.Atomic Ennergys Society of Japan Tokyo,1985,137-421
6[12]Michikuni,Shmo,et al.Inercomparison of Different Instruments that Mensure Radon Concentration in Air,In:Radon and it Decay Products Occurrence.Properties and Health Effects,Edited by Philip K.Hope,1987.160-171