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- Isotopes_of_krypton abstract "There are 33 known isotopes of krypton (Kr) with atomic mass numbers from 69 through 101. Naturally occurring krypton is made of six stable isotopes, two of which might theoretically be slightly radioactive, plus traces of radioisotopes that are produced by cosmic rays in the atmosphere.The spectral signature of krypton can be observed to have several very sharp lines. When krypton is placed into an electric discharge tube, it emits visible light with a distinctive orange-red color.Krypton-86 was formerly used to define the meter from 1960 until 1983, when the definition of the meter was the wavelength of the 605 nm (orange) spectral line of a krypton-86 atom.Radioactive krypton-81 is the product of reactions with cosmic rays that strike the atmosphere, along with some of the other isotopes of krypton. Krypton-81 has a half-life of about 229,000 years.Krypton-81 has been used for dating old (50,000- to 800,000-year-old) groundwater.Krypton-85 is a radioisotope of krypton that has a half-life of about 10.75 years. This isotope is produced by the nuclear fission of uranium and plutonium in nuclear weapons testing and in nuclear reactors, as well as by cosmic rays. An important goal of the Limited Nuclear Test Ban Treaty of 1963 was to eliminate the release of such radioisotopes into the atmosphere, and since 1963 much of that krypton-85 has had time to decay. However, it is inevitable that krypton-85 is released during the reprocessing of fuel rods from nuclear reactors.The atmospheric concentration of krypton-85 around the North Pole is about 30 percent higher than that at the Amundsen–Scott South Pole Station at the South Pole because nearly all of the world's nuclear reactors and all of its major nuclear reprocessing plants are located in the Northern Hemisphere, and also well-north of the equator.To be more specific, those nuclear reprocessing plants with significant capacities are located in the United States, the United Kingdom, the French Republic, the Russian Federation, Mainland China (PRC), Japan, India, and Pakistan. See the article on nuclear reprocessing for more information.All of the other radioisotopes of krypton have half-lives of less than one day, except for krypton-79, which has a half-life of about 35.0 hours. This isotope decays by the emission of positrons and thus becoming bromine.Relative atomic mass: 83.798.".
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- Isotopes_of_krypton wikiPageWikiLink Amundsen–Scott_South_Pole_Station.
- Isotopes_of_krypton wikiPageWikiLink Atmosphere.
- Isotopes_of_krypton wikiPageWikiLink Beta_decay.
- Isotopes_of_krypton wikiPageWikiLink Bromine.
- Isotopes_of_krypton wikiPageWikiLink Brookhaven_National_Laboratory.
- Isotopes_of_krypton wikiPageWikiLink CRC_Handbook_of_Chemistry_and_Physics.
- Isotopes_of_krypton wikiPageWikiLink CRC_Press.
- Isotopes_of_krypton wikiPageWikiLink Category:Isotopes_of_krypton.
- Isotopes_of_krypton wikiPageWikiLink Category:Krypton.
- Isotopes_of_krypton wikiPageWikiLink Category:Lists_of_isotopes_by_element.
- Isotopes_of_krypton wikiPageWikiLink China.
- Isotopes_of_krypton wikiPageWikiLink Cosmic_ray.
- Isotopes_of_krypton wikiPageWikiLink Electron_capture.
- Isotopes_of_krypton wikiPageWikiLink Equator.
- Isotopes_of_krypton wikiPageWikiLink France.
- Isotopes_of_krypton wikiPageWikiLink Gas-filled_tube.
- Isotopes_of_krypton wikiPageWikiLink Groundwater.
- Isotopes_of_krypton wikiPageWikiLink Half-life.
- Isotopes_of_krypton wikiPageWikiLink History_of_the_metre.
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- Isotopes_of_krypton wikiPageWikiLink Isotope.
- Isotopes_of_krypton wikiPageWikiLink Japan.
- Isotopes_of_krypton wikiPageWikiLink Krypton.
- Isotopes_of_krypton wikiPageWikiLink Krypton-85.
- Isotopes_of_krypton wikiPageWikiLink Light.
- Isotopes_of_krypton wikiPageWikiLink Mass_number.
- Isotopes_of_krypton wikiPageWikiLink National_Nuclear_Data_Center.
- Isotopes_of_krypton wikiPageWikiLink Neutron.
- Isotopes_of_krypton wikiPageWikiLink Neutron_emission.
- Isotopes_of_krypton wikiPageWikiLink North_Pole.
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- Isotopes_of_krypton wikiPageWikiLink Nuclear_Physics_(journal).
- Isotopes_of_krypton wikiPageWikiLink Nuclear_fission.
- Isotopes_of_krypton wikiPageWikiLink Nuclear_fuel.
- Isotopes_of_krypton wikiPageWikiLink Nuclear_isomer.
- Isotopes_of_krypton wikiPageWikiLink Nuclear_reactor.
- Isotopes_of_krypton wikiPageWikiLink Nuclear_reprocessing.
- Isotopes_of_krypton wikiPageWikiLink Nuclear_weapons_testing.
- Isotopes_of_krypton wikiPageWikiLink Pakistan.
- Isotopes_of_krypton wikiPageWikiLink Partial_Nuclear_Test_Ban_Treaty.
- Isotopes_of_krypton wikiPageWikiLink Plutonium.
- Isotopes_of_krypton wikiPageWikiLink Positron.
- Isotopes_of_krypton wikiPageWikiLink Proton.
- Isotopes_of_krypton wikiPageWikiLink Proton_emission.
- Isotopes_of_krypton wikiPageWikiLink Pure_and_Applied_Chemistry.
- Isotopes_of_krypton wikiPageWikiLink Radioactive_decay.
- Isotopes_of_krypton wikiPageWikiLink Radionuclide.
- Isotopes_of_krypton wikiPageWikiLink Relative_atomic_mass.
- Isotopes_of_krypton wikiPageWikiLink Russia.
- Isotopes_of_krypton wikiPageWikiLink South_Pole.
- Isotopes_of_krypton wikiPageWikiLink Stable_isotope_ratio.
- Isotopes_of_krypton wikiPageWikiLink Stable_nuclide.
- Isotopes_of_krypton wikiPageWikiLink United_Kingdom.
- Isotopes_of_krypton wikiPageWikiLink United_States.
- Isotopes_of_krypton wikiPageWikiLink Uranium.
- Isotopes_of_krypton wikiPageWikiLink Talk:Isotopes_of_krypton.
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