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  2. Radon - Wikipedia

    en.wikipedia.org/wiki/Radon

    Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only 222 Rn has a sufficiently long half-life (3.825 days) for it to be released from the soil and rock

  3. Radium and radon in the environment - Wikipedia

    en.wikipedia.org/wiki/Radium_and_radon_in_the...

    In a working mine, the radon level can be controlled by ventilation, sealing off old workings and controlling the water in the mine. The level in a mine can go up when a mine is abandoned; it can reach a level which can cause the skin to become red (a mild radiation burn). The radon levels in some of the mines can reach 400 to 700 kBq m −3. [17]

  4. Officials highlight the dangers of radon - AOL

    www.aol.com/news/officials-highlight-dangers...

    Radon occurs naturally when uranium in soil or rock breaks down to form radium, which then turns into radon gas. ... color or taste, radon is a slow killer. ... the only way to know is to do a ...

  5. Radium - Wikipedia

    en.wikipedia.org/wiki/Radium

    226 Ra is the most stable isotope of radium and is the last isotope in the (4 n + 2) decay chain of uranium-238 with a half-life of over a millennium; it makes up almost all of natural radium. Its immediate decay product is the dense radioactive noble gas radon (specifically the isotope 222 Rn ), which is responsible for much of the danger of ...

  6. Radon-222 - Wikipedia

    en.wikipedia.org/wiki/Radon-222

    Radon-222 (222 Rn, Rn-222, historically radium emanation or radon) is the most stable isotope of radon, with a half-life of approximately 3.8 days. It is transient in the decay chain of primordial uranium-238 and is the immediate decay product of radium-226 .

  7. Luminous paint - Wikipedia

    en.wikipedia.org/wiki/Luminous_paint

    Radioluminescent paint is a self-luminous paint that consists of a small amount of a radioactive isotope (radionuclide) mixed with a radioluminescent phosphor chemical. The radioisotope continually decays, emitting radiation particles which strike molecules of the phosphor, exciting them to emit visible light.

  8. Health effects of radon - Wikipedia

    en.wikipedia.org/wiki/Health_effects_of_radon

    Average radiation doses received in Germany. Radon accounts for half of the background dose; and medical doses reach the same levels as background dose. The largest natural contributor to public radiation dose is radon, a naturally occurring, radioactive gas found in soil and rock, [65] which comprises approximately 55% of the annual background ...

  9. What is the red fire retardant dropped by planes to fight LA ...

    www.aol.com/red-fire-retardant-dropped-planes...

    The red color of the fire retardant is caused by the chemical component iron oxide, commonly known as rust. ... including when a fire threatens "life or property" and "the risk of damage to ...