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Naturally occurring strontium is nonradioactive and nontoxic at levels normally found in the environment, but 90 Sr is a radiation hazard. [4] 90 Sr undergoes β − decay with a half-life of 28.79 years and a decay energy of 0.546 MeV distributed to an electron, an antineutrino, and the yttrium isotope 90 Y, which in turn undergoes β − decay with a half-life of 64 hours and a decay energy ...
Tritium is a low-energy beta emitter commonly used as a radiotracer in research and in traser [check spelling] self-powered lightings. The half-life of tritium is 12.3 years. The electrons from beta emission from tritium are so low in energy (average decay energy 5.7 keV) that a Geiger counter cannot be used to detect them. An advantage of the ...
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. [1]
90 Sr decays into 90 Y which is a beta emitter with a half-life of 2.67 days. 90 Y is sometimes used for medical purposes and can be obtained either by the neutron activation of stable 89 Y or by using a device similar to a technetium cow. As the half lives of the unstable Yttrium isotopes are low (88
The biological half-life of strontium in humans has variously been reported as from 14 to 600 days, [86] [87] 1,000 days, [88] 18 years, [89] 30 years [90] and, at an upper limit, 49 years. [91] The wide-ranging published biological half-life figures are explained by strontium's complex metabolism within the body.
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The longest-lived of these isotopes, and the most relevantly studied, are 90 Sr with a half-life of 28.9 years, 85 Sr with a half-life of 64.853 days, and 89 Sr (89 Sr) with a half-life of 50.57 days. All other strontium isotopes have half-lives shorter than 50 days, most under 100 minutes. Strontium-89 is an artificial radioisotope used in ...
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