Factors Affecting Radon Transport and the Concentration of Radon in Mines.
Chap 154 in "Radiation Hazards in Mining: Control Measure and Med Aspects" PP 1022-1028 :1022-1028
Basic to solving the problem of the role of radon transport on radon concentrations in mines is to establish whether it occurs primarily as diffusion in force flow through porous rock or through fissures in the rock. The laboratory experiments performed involved measurements of diffusion and emanation coefficients, porosity, and permeability of representative rock samples. Significant differences have been found when comparing the results of the laboratory permeability determinations to those of the mine determinations. Considerations of underlying principles, however, suggest that the diffusion and emanation coefficients are the same in laboratory and mine. It was also found that moisture content plays a dominant role in radon transport through rock. Using these concepts and findings, some conclusions about the radon concentrations in mines have been drawn.
Chap. 154 in "Radiation Hazards in Mining: Control, Measure., and Med. Aspects", PP. 1022-1028