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Radioactive krypton-81 is the product of spallation reactions with cosmic rays striking gases present in the Earth atmosphere, along with the six stable or nearly stable krypton isotopes. [11] Krypton-81 has a half-life of about 229,000 years. Krypton-81 is used for dating ancient (50,000- to 800,000-year-old) groundwater and to determine their ...
Pages in category "Isotopes of krypton" The following 48 pages are in this category, out of 48 total. This list may not reflect recent changes. ...
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
This page uses the meta infobox {{Infobox isotopes (meta)}} for the element isotopes infobox. This infobox contains the table of § Main isotopes, and the § Standard atomic weight. For example, {{Infobox uranium isotopes}}, as used on page Isotopes of uranium. The main isotopes table is reused in the regular Infobox: {{Infobox uranium}}.
Pages in category "Lists of isotopes by element" The following 122 pages are in this category, out of 122 total. ... Isotopes of krypton; L. Isotopes of lanthanum;
Naturally occurring krypton in Earth's atmosphere is composed of five stable isotopes, plus one isotope (78 Kr) with such a long half-life (9.2×10 21 years) that it can be considered stable. (This isotope has the third-longest known half-life among all isotopes for which decay has been observed; it undergoes double electron capture to 78 Se ).
Krypton has several isotopes, with 78, 80, 82 Kr being primordial, while 83,84, 86 Kr results from spontaneous fission of 244 Pu and radiogenic decay of 238 U. [113] [97] Krypton's isotopes geochemical signature in mantle reservoirs resembling the modern atmosphere. preserves the solar-like primordial signature. [114]
Of the 26 "monoisotopic" elements that have only a single stable isotope, all but one have an odd atomic number—the single exception being beryllium. In addition, no odd-numbered element has more than two stable isotopes, while every even-numbered element with stable isotopes, except for helium, beryllium, and carbon, has at least three.