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  2. Isotopes of radon - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_radon

    There are 39 known isotopes of radon (86 Rn), from 193 Rn to 231 Rn; all are radioactive.The most stable isotope is 222 Rn with a half-life of 3.8235 days, which decays into 218 Po

  3. 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 .

  4. Radon - Wikipedia

    en.wikipedia.org/wiki/Radon

    Measurement of radon levels in the first decades of its discovery was mainly done to determine the presence of radium and uranium in geological surveys. In 1956, most likely the first indoor survey of radon decay products was performed in Sweden, [87] with the intent of estimating the public exposure to radon and its decay products. From 1975 ...

  5. Radium and radon in the environment - Wikipedia

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

    Radon is a major cause of cancer; it is estimated to contribute to ~2% of all cancer related deaths in Europe. [1] Radium, like radon, is radioactive and is found in small quantities in nature and is hazardous to life if radiation exceeds 20-50 mSv/year. Radium is a decay product of uranium and thorium. [2]

  6. List of radioactive nuclides by half-life - Wikipedia

    en.wikipedia.org/wiki/List_of_radioactive...

    1.2 radium-215m2: 1.39 bismuth-211m: 1.4 uranium-222: 1.4 radium-217: 1.63 neptunium-223: 2.15 radium-210m: 2.24 radon-215: 2.30 bismuth-217m: 2.70 polonium-211m3: 2.8 radon-209m2: 3.0 bismuth-202m1: 3.04 polonium-213: 3.65 lead-198m1: 4.19 protactinium-221: 4.9 astatine-210m2: 5.66 nobelium-250: 5.7 lead-212m: 6.0 lead-214m: 6.2 bismuth-187m2 ...

  7. Decay chain - Wikipedia

    en.wikipedia.org/wiki/Decay_chain

    For example, the third atom of nihonium-278 synthesised underwent six alpha decays down to mendelevium-254, [2] followed by an electron capture (a form of beta decay) to fermium-254, [2] and then a seventh alpha to californium-250, [2] upon which it would have followed the 4n + 2 chain (radium series) as given in this article.

  8. Naturally occurring radioactive material - Wikipedia

    en.wikipedia.org/wiki/Naturally_occurring...

    Radon gas in the natural gas streams concentrate as NORM in gas processing activities. Radon decays to lead-210, then to bismuth-210, polonium-210 and stabilizes with lead-206. Radon decay elements occur as a shiny film on the inner surface of inlet lines, treating units, pumps and valves associated with propylene, ethane and propane processing ...

  9. Environmental radioactivity - Wikipedia

    en.wikipedia.org/wiki/Environmental_radioactivity

    Radium and radon are in the environment because they are decay products of uranium and thorium. The radon (222 Rn) released into the air decays to 210 Pb and other radioisotopes, and the levels of 210 Pb can be measured. The rate of deposition of this radioisotope is dependent on the weather.