/Docs/OTF/org/iaea/GSR3/Footnote/57.md
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Footnote 57
On the assumption of an equilibrium factor for 222Rn of 0.4 and an annual occupancy of 2000 h, the value of activity concentration due to 222Rn of 1000 Bq/m3 corresponds to an annual effective dose of the order of 10 mSv.