An image of a smoke detector.

Ionization smoke detectors use a small amount of radioactive material, americium-241, to detect smoke.. Click to close content box.

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Tritium is a naturally-occurring radioactive isotope of hydrogen that is often used to light up a sign without batteries or electricity . Click to close content box.

An image of radioactive tracers being used to image the brain.

Discover how iodine-131 is used as a medical tracer and where to learn more. Click to close content box.

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When radium was discovered in the early 1900s, people were fascinated by its mysterious glow and it was added to many everyday products, including paints. Click to close content box.

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Radon is a natural, radioactive gas that you can't see or smell. Click to close content box.

An image of uranium ore.

Uranium is a naturally-occurring radioactive element that is primarily used as fuel for nuclear reactors that make electricity. Click to close content box.

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Discover how phosphorus is used - additional text needed here.. Click to close content box.