Efficiency of lead aprons in blocking radiation −
2016-5-1 · The maximum exposure allowed to the general public (i.e. unprotected individuals) from controllable sources is recommended by the Health Physics Society to not exceed 1 mSv annually above the annual natural background radiation (which is 3.1 mSv), with an effective dose up to 5 mSv per year in special (infrequent) …
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