cesium 137

noun

, Chemistry.

1. 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.

Example Sentences

Of particular concern: cesium-137 in the pool, at levels Alvarez estimates at 20 million to 50 million curies.

From The Daily Beast

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

From Project Gutenberg