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  2. Rubidium - Wikipedia

    en.wikipedia.org/wiki/Rubidium

    Although rubidium is monoisotopic, rubidium in the Earth's crust is composed of two isotopes: the stable 85 Rb (72.2%) and the radioactive 87 Rb (27.8%). [23] Natural rubidium is radioactive, with specific activity of about 670 Bq/g, enough to significantly expose a photographic film in 110 days.

  3. Solid solution - Wikipedia

    en.wikipedia.org/wiki/Solid_solution

    The propensity for any two substances to form a solid solution is a complicated matter involving the chemical, crystallographic, and quantum properties of the substances in question. Substitutional solid solutions, in accordance with the Hume-Rothery rules, may form if the solute and solvent have: Similar atomic radii (15% or less difference)

  4. Radiochemistry - Wikipedia

    en.wikipedia.org/wiki/Radiochemistry

    Radiochemistry is the chemistry of radioactive materials, where radioactive isotopes of elements are used to study the properties and chemical reactions of non-radioactive isotopes (often within radiochemistry the absence of radioactivity leads to a substance being described as being inactive as the isotopes are stable).

  5. Radiation - Wikipedia

    en.wikipedia.org/wiki/Radiation

    Similarly, using other radioactive elements, the age of rocks and other geological features (even some man-made objects) can be determined; this is called Radiometric dating. Environmental scientists use radioactive atoms, known as tracer atoms, to identify the pathways taken by pollutants through the environment.

  6. Fission products (by element) - Wikipedia

    en.wikipedia.org/wiki/Fission_products_(by_element)

    Krypton-85, with a half-life 10.76 years, is formed by the fission process with a fission yield of about 0.3%. Only 20% of the fission products of mass 85 become 85 Kr itself; the rest passes through a short-lived nuclear isomer and then to stable 85 Rb. If irradiated reactor fuel is reprocessed, this radioactive krypton may be released into ...

  7. Promethium - Wikipedia

    en.wikipedia.org/wiki/Promethium

    The production methods for different isotopes vary, and only those for promethium-147 are given because it is the only isotope with industrial applications. Promethium-147 is produced in large quantities (compared to other isotopes) by bombarding uranium-235 with thermal neutrons. The output is relatively high, at 2.6% of the total product. [56]

  8. Sodium - Wikipedia

    en.wikipedia.org/wiki/Sodium

    Two radioactive, cosmogenic isotopes are the byproduct of cosmic ray spallation: 22 Na has a half-life of 2.6 years and 24 Na, a half-life of 15 hours; all other isotopes have a half-life of less than one minute. [17] Two nuclear isomers have been discovered, the longer-lived one being 24m Na with a half-life

  9. Radon - Wikipedia

    en.wikipedia.org/wiki/Radon

    The gas mixture extracted from the solutions contains H 2, O 2, He, Rn, CO 2, H 2 O and hydrocarbons. The mixture is purified by passing it over copper at 993 K (720 °C; 1,328 °F) to remove the H 2 and the O 2, and then KOH and P 2 O 5 are used to remove the acids and moisture by sorption.