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Vadim26 [7]
3 years ago
6

What is the source of the radioactivity?

Physics
1 answer:
Nataly_w [17]3 years ago
4 0
The Earth itself is a source of terrestrial radiation. Radioactive materials including uranium, thorium, and radium exist naturally in soil and rock. Essentially all air contains radon<span> , which is responsible for most of the dose that Americans receive each year from natural background sources.</span>
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