strontium 90

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a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones
The strontium isotope with mass 90, having a half-life of 28 years, used for its high-energy beta emission in certain nuclear electric power sources and constituting a radiation hazard in fallout
The radioactive isotope of strontium, 9038Sr, that is present in the fallout from nuclear explosions and, being chemically similar to calcium, is accumulated in the bones
strontium 90
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