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radiosodium

[rey-dee-oh-soh-dee-uh m] /ˌreɪ di oʊˈsoʊ di əm/
noun, Chemistry
1.
the radioactive isotope of sodium having an atomic mass of 24 and a half-life of 14.9 hours: used as a tracer in biochemistry.
Origin
1930-1935
1930-35; radio- + sodium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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