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Krypton-81 is useful in determining how old the water beneath the ground is. [10] 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.
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 ).
Cosmogenic nuclides (or cosmogenic isotopes) are rare nuclides created ... krypton: 81: 229,000: groundwater tracer Use in geochronology
81 Br: 81m Kr synth 13.10 s: IT: 81 Kr ... Main isotopes of krypton; Main isotopes [1] Decay; abundance half-life (t 1/2) mode product; 78 Kr 0.360% 9.2 ...
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.
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81 Br: 81m Kr synth 13.10 s: IT: 81 Kr ... Main isotopes of krypton; Main isotopes [10] Decay; abundance half-life (t 1/2) mode product; 78 Kr 0.360% 9.2 ...