/Docs/G/Org-IAEA-Safety-GSR3-CmA/Footnote/55.md
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Footnote 55
On the assumption of an equilibrium factor for ²²²Rn of 0.4 and an annual occupancy of 7000 h, the value of activity concentration due to ²²²Rn of 300 Bq/m³ corresponds to an annual effective dose of the order of 10 mSv.