Question 1

What is annual background radiation?

Accepted Answer

About 3 mSv/year average. Varies: radon, altitude, soil, medical procedures. Denver: higher than coast.

Question 2

What contributes to radiation exposure?

Accepted Answer

Radon (42%), medical (36%), cosmic (5%), terrestrial (3%), internal (5%), consumer products (2%).

Question 3

What's the difference between exposure and dose?

Accepted Answer

Exposure (roentgen) measures radiation in air. Absorbed dose (gray/rad) measures energy deposited. Equivalent dose (sievert/rem) accounts for biological effect.

Question 4

What are safe radiation levels?

Accepted Answer

Background radiation: ~3 mSv/year. Occupational limit: 50 mSv/year. Single dose effects start around 250 mSv. Always follow ALARA principle.

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