What was the total average annual effective dose from natural background and human-made radiations combined as of 2006?

Name: What was the total average annual effective dose from natural background and human-made radiations combined as of 2006?
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As of 2006, the total average annual effective dose from natural background and human-made radiations combined was estimated to be 6.3 mSv according to the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR).

What Was the Total Average Annual Effective Dose from Natural