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Krypton-83 has application in magnetic resonance imaging (MRI) for imaging airways. In particular, it enables the radiologist to distinguish between hydrophobic and hydrophilic surfaces containing an airway. [44]
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.
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.
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]
For example, rubidium-83 (37 protons, 46 neutrons) will decay to krypton-83 (36 protons, 47 neutrons) solely by electron capture (the energy difference, or decay energy, is about 0.9 MeV). History [ edit ]
Additionally, krypton is a lighter ion, so the unit mass per ionization energy is further reduced compared to xenon. However, xenon can be more than ten times as expensive as krypton per kilogram , making krypton a more economical choice for building out satellite constellations like that of SpaceX 's Starlink V1, whose original Hall thrusters ...
Spectral lines of krypton: Other properties; Natural occurrence: primordial: Crystal structure ... 83 Kr 11.5% stable 84 Kr 57.0% stable 85 Kr: trace 11 y:
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