cesium 137

noun

: a radioactive isotope of cesium that has the mass number 137 and a half-life of about 12 months and that is a by-product of nuclear fission

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Cite this Entry

“Cesium 137.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cesium%20137. Accessed 21 Nov. 2024.

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