Equilibrium Equivalent Concentration


Equilibrium Equivalent Concentration :

The activity concentration of radon or thoron in radioactive equilibrium with its short-lived progeny that would have the same potential alpha energy concentration as the actual (non-equilibrium) mixture. The equilibrium equivalent concentration of radon is given by EEC radon = 0.104 * C(218Po) + 0.514 * C(214Pb) + 0.382 * C(214Bi) where C(x) is the concentration of nuclide x in air. 1 Bq/m3 EEC radon corresponds to 5.56 * 10-6 mJ/m3. The equilibrium equivalent concentration of thoron is given by EEC thoron = 0.913 * C(212Pb) + 0.087 * C(212Bi) where C(x) is the concentration of nuclide x in air. 1 Bq/m3 EEC thoron corresponds to 7.57 * 10-5 mJ/m3

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