Concept:Natural background radiation emanates constantly from cosmic rays, radon gas, and trace radioactive elements in soil and food.
Solution:- While global averages vary from 1 to 3 mSv depending on altitude and local geology, a baseline figure of approximately 1 mSv (milliSievert) per year is the universally taught textbook standard for public exposure minimums.
- Because Sieverts (Sv) account for the biological impact of different radiations (Equivalent Dose), it is the correct unit for measuring human health risk over time.
Why other options are incorrect:1 Gy or 1 Sv are massive, catastrophic acute radiation doses that would induce severe radiation sickness. 1 mGy only measures raw energy absorbed, ignoring biological hazard weightings.
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