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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 ...
One strontium unit is equal to one picocurie from strontium-90 per gram of calcium (37 becquerels per kilogram) in the subject's skeleton. The United States National Academy of Sciences holds that the maximum safe measure of strontium-90 in a person is one hundred strontium units (3700 Bq/kg).
Strontium is a chemical element; it has symbol Sr and atomic number 38. ... but long enough that it can take hundreds of years to decay to safe levels.
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 ...
However, radiation affected the environment over a much wider scale than this 30 km radius encloses. According to reports from Soviet scientists, 28,000 square kilometers (km 2 , or 10,800 square miles, mi 2 ) were contaminated by caesium-137 to levels greater than 185 kBq per square meter. 830,000 people lived in this area.
Zirconium-90 mostly forms by successive beta decays out of Strontium-90. A nonradioactive Zirconium sample can be extracted from spent fuel by extracting Strontium-90 and allowing enough of it to decay (e.g. In an RTG). The Zirconium can then be separated from the remaining strontium leaving a very isotopically pure Zr-90 sample.
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