| http://www.w3.org/ns/prov#value | - On the other hand, several reports have indicated the health risks of high-level radon, especially for the lungs and skin [9???11]; however, in radon therapy at Misasa, therapeutic exposure doses within the range of 50???67?????Sv are lower than the average annual amount of natural radiation (2.4???mSv) [12].
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