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With 3-month simultaneous measurements of thoron and its progeny concentrations in the lowest floors of 109 homes, the geometric mean (GM) of thoron equilibrium factor was determined to be 0.019 with a geometric standard deviation (GSD) of 3.63. Combined with the analysis from results obtained from a previous study in 138 homes, the GM of thoron equilibrium factor was determined to be 0.022 with a GSD of 3.02. The results indicate that the  F  value of 0.02 for thoron recommended by UNSCEAR is a reasonable value for those Canadian homes tested.

Determination of thoron equilibrium factor from simultaneous long-term thoron and its progeny measurements