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  2. Uranium in the environment - Wikipedia

    en.wikipedia.org/wiki/Uranium_in_the_environment

    Uranium in the environment is a global health concern, and comes from both natural and man-made sources. Beyond naturally occurring uranium, mining, phosphates in agriculture, weapons manufacturing, and nuclear power are anthropogenic sources of uranium in the environment. [1]

  3. Radioactive waste - Wikipedia

    en.wikipedia.org/wiki/Radioactive_waste

    Thus plutonium may decay and leave uranium-235. However, modern reactors are only moderately enriched with U-235 relative to U-238, so the U-238 continues to serve as a denaturation agent for any U-235 produced by plutonium decay. One solution to this problem is to recycle the plutonium and use it as a fuel e.g. in fast reactors.

  4. Uranium-235 - Wikipedia

    en.wikipedia.org/wiki/Uranium-235

    Uranium-235 (235 U or U-235) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a nuclear chain reaction. It is the only fissile isotope that exists in nature as a primordial nuclide. Uranium-235 has a half-life of 703.8 million years.

  5. 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. Below is a graph of the deposition rate observed in ...

  6. Environmental impact of nuclear power - Wikipedia

    en.wikipedia.org/wiki/Environmental_impact_of...

    Uranium mining is the process of extracting uranium ore from the ground. Kazakhstan, Canada, and Australia are the top three producers and together account for 63% of world uranium production. [30] A prominent use of uranium is as fuel for nuclear power plants. The mining and milling of uranium present significant dangers to the environment. [31]

  7. Long-lived fission product - Wikipedia

    en.wikipedia.org/wiki/Long-lived_fission_product

    The high short-term radioactivity of spent nuclear fuel is primarily from fission products with short half-life.The radioactivity in the fission product mixture is mostly due to short-lived isotopes such as 131 I and 140 Ba, after about four months 141 Ce, 95 Zr/ 95 Nb and 89 Sr constitute the largest contributors, while after about two or three years the largest share is taken by 144 Ce/ 144 ...

  8. Actinides in the environment - Wikipedia

    en.wikipedia.org/wiki/Actinides_in_the_environment

    The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...

  9. Uranium tailings - Wikipedia

    en.wikipedia.org/wiki/Uranium_tailings

    Uranium tailings or uranium tails are a radioactive waste byproduct of conventional uranium mining and uranium enrichment. They contain the radioactive decay products from the uranium decay chains, mainly the U-238 chain, and heavy metals. Long-term storage or disposal of tailings may pose a danger for public health and safety.