Radiation

Radioactivity Is Everywhere

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Chances are, there's something radioactive in your home! Learn just how common radioactive items are, then visit the most radioactive places on the planet.

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Key Facts In This Video

  1. Bananas are high in potassium, and thus high in the radioactive isotope potassium 40. 00:17

  2. Emergency exit signs are radioactive, because they contain tritium. 01:24

  3. We are bombarded with radiation from the sun at all times. 02:02

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Key Facts In This Video

  1. If the human body is exposed to more than two sieverts of ionizing radiation at once, it will die. 00:50

  2. As an airplane gains altitude, the level of radiation inside the plane increases. 05:07

  3. The lungs of smokers are exposed to more ionizing radiation than people living near Fukushima, radiation workers, and astronauts. 09:57

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Key Facts In This Video

  1. Airplane passengers are the people most likely to be exposed to dark lightning. 00:22

  2. Dark lightning is an invisible spray of x-rays and gamma rays that can occur at the same time as visible lightning. 00:49

  3. There's approximately one dark lightning flash for every thousand visible lightning flashes. 01:54

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