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Updated: Jun 1, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Determination of thoron equilibrium factor from simultaneous long-term thoron and its progeny measurements
Jing Chen1, Deborah Moir, Atsuyuki Sorimachi
1Radiation Protection Bureau, Health Canada, 2720 Riverside Drive, Ottawa, Canada, K1A 0K9. jing.chen@hc-sc.gc.ca
Abstract:
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.
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