cesium 137

cesium 137

noun Chemistry.
the radioactive cesium isotope with mass number 137 and a half-life of 33 years: used for gamma irradiation of certain foods and for radiation therapy.
Also called radiocesium.
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Cesium 137 is always a great word to know.
So is oxide. Does it mean:
noting compounds that readily decompose or change into other compounds
a compound in which oxygen is bonded to one or more electropositive atoms
WordNet
cesium 137

noun
a radioactive isotope of cesium used in radiation therapy 
WordNet® 3.0, © 2006 by Princeton University.
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