strontium-90

listen to the pronunciation of strontium-90
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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
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