https://en.wikipedia.org/wiki/Background_radiation
Natural background: 2.40 mSv/year (world average)
Atmospheric testing: "peak of 0.11 mSv in 1963"
https://en.wikipedia.org/wiki/Background_radiation
Natural background: 2.40 mSv/year (world average)
Atmospheric testing: "peak of 0.11 mSv in 1963"