yttrium

yttrium /yt·tri·um/ (i´tre-um) chemical element, at. no. 39, symbol Y. The radioisotope 90Y emits high energy beta particles, localizes predominantly in bone, and has been used in radiotherapy.

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yt·tri·um (tr-m)

n. Symbol Y

A silvery, ductile, rare-earth element used in various alloys. Atomic number 39.

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yttrium (Y) (it´rēm),

n a scaly, grayish metallic element with an atomic number of 39 and an atomic weight of 88.9059. Radioactive isotopes of yttrium have been used in cancer therapy.

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yttrium

a chemical element, atomic number 39, atomic weight 88.905, symbol Y. See Table 6.

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yttrium An ultrarare metalic element–atomic number, 39; atomic weight, 88.9–named after Ytterby in southern Sweden, which may be used in nuclear medicine scans