Radon-222 is a radioactive gas that forms naturally from the decay of radium. It is found in soil and rocks, and can seep into buildings through cracks and openings, making it a potential health hazard. It is also the largest contributor to background radiation, which is the radiation that is always present in the environment. Therefore, option D is the correct answer.

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Radon-222

Question 67

Multiple Choice

Radon-222

A) is a radioactive gas produced from the decay of radium
B) is naturally occurring
C) is the largest contributor to background radiation
D) all of the above

Correct Answer: