caesium-137
caesium-137 (seez-iŭm) n. an artificial radioactive isotope of the metallic element caesium, used rarely in radiotherapy. Symbol: 137Cs. See also teletherapy.
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Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
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During the late 1830s an… Samarium , Samarium (revised)
Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
Overview
Samarium is one of the rare… Essential Element , essential element Any of a number of elements required by living organisms to ensure normal growth, development, and maintenance. Apart from the elem…
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Cs (element)
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Cs (element)