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Definition of Yttrium-90
1. Noun. (isotope) An isotope of yttrium, (nuclide 90 39 Y), that is used in radiotherapy ¹
¹ Source: wiktionary.com
Medical Definition of Yttrium-90
1. An artificial radioactive isotope with a physical half-life of 2.67 days which decays with the emission of a 2.282 Mev b particle; used as an implant in pituitary ablation. (05 Mar 2000)