Equilibrium factor
The ratio of the equilibrium equivalent concentration of radon to the actual radon concentration.
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Previous glossary entries
from ICRP Publication 126, 2014 and ICRP Publication 115, 2010
The ratio of the equilibrium equivalent concentration to the radon gas concentration. In other words the ratio of potential alpha energy concentration for the actual mixture of radon decay product to that which would apply at radioactive equilibrium.