cesium 137

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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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of cesium 137

  • It was established that strontium-90 and cesium-137, important in fallout on land, enter the marine cycles only in minute amounts.