What is the Largest Single Source of Radiation Exposure for the Average

Question

What is the largest single source of radiation exposure for the average person in the U.S.?
A) radon
B) medical X-rays
C) cosmic
D) nuclear medicine
E) consumer products

Accepted Answer

Radon gas, which is a naturally occurring radioactive gas that comes from the decay of uranium in the soil, is the largest single source of radiation exposure for the average person in the U.S. It can accumulate in buildings, especially in confined areas like basements and is harmful when inhaled over long periods.