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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 ...
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.
Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above. The NUBASE2020 evaluation of nuclear physics properties F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides.
Strontium-90 has a shorter half-life, produces less power, and requires more shielding than plutonium-238, but is cheaper as it is a fission product and is present in a high concentration in nuclear waste and can be relatively easily chemically extracted. Strontium-90 based RTGs have been used to power remote lighthouses. [1]
The produced radionuclides have varying half-lives, and therefore vary in radioactivity. For instance, strontium-89 and strontium-90 are produced in similar quantities in fission, and each nucleus decays by beta emission. But 90 Sr has a 30-year half-life, and 89 Sr a 50.5-day half-life.
Strontium-90 is also called a "bone seeker" because it acts similarly to calcium — accumulating in bones — while increasing the risk of cancer. Concerned about earthquakes, the DOE decided the ...
In 2008 it conducted a study that found radiation, then publicly documented for the first time in 2023 the detection of radiation involving levels of radium-226 and strontium-90.
Half life Windscale Three Mile Island (compared to Windscale) Chernobyl Fukushima Daiichi (atmospheric) Iodine-131: 8.0197 days 740 much less 1,760,000 130,000 Caesium-137: 30.17 years 22 much less 79,500 35,000 Xenon-133: 5.243 days 12,000 6,500,000 17,000,000 Xenon-135: 9.2 hours 25 × Windscale Strontium-90: 28.79 years much less 80,000 ...