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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 ...
Project GABRIEL was an investigation to gauge the impact of nuclear fallout resulting from nuclear warfare.The United States Atomic Energy Commission surmised that the radioactive isotope strontium-90 (Sr-90) presented the greatest hazard to life globally, [1] which resulted in the commissioning of Project SUNSHINE: which sought to examine the levels of Sr-90 in human tissues and bones (with a ...
In a 1957 article, Dr. Whitlock, director of Health Education in the National Dairy Council, Chicago, Illinois, discussed the impact of strontium-90 in the cow milk consumed by humans, concluding that the effects of Sr-90 would not be detectably harmful to the general populace of the US. "From the foregoing information, it would seem we have a ...
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.
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.
While some radioisotopes, such as strontium-90 (90 Sr) and technetium-99 (99 Tc), are only found on Earth as a result of human activity, and some, like potassium-40 (40 K), are only present due to natural processes, a few isotopes, such as tritium (3 H), result from both natural processes and human activities.
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.
People who sit at a desk all day face a greater risk for heart disease, according to a new study published in the Journal of the American College of Cardiology.. Even if those desk dwellers do ...