Agent Name

Yttrium-90

CAS Number

10098-91-6

Formula

Y

Major Category

Physical/Radiation

Category

Radionuclides

Description

The metal is a gray lustrous powder with a melting point of 1522 degrees C. [Merck Index]

Sources/Uses

The naturally-occurring, stable isotope is Y-89. It is found in the minerals xenotime, fergusonite, samarskite, yttrialite, and gadolinite. The man-made radioactive isotopes are Y-80-88 and Y-90-100. [Merck Index] Yttrium-90 silicate citrate has been used in intra-articular radiotherapy to irradiate diseased synovial tissues giving a dose of about 60-80 Gy to synovium of the knee joint. [Gusev, p. 112] Used in the treatment of cancer and rheumatoid arthritis; [Waltar, p. 281]

Comments

Source: Decay of strontium-90, a product of nuclear fission; Half-Life: 64 hours Effective Half-Life: 64 hours Specific Activity: 550,000 Ci/g Decay Mode: Beta Lung Clearance Half-Time: Years, oxides and hydroxides; Weeks, all other compounds; Critical Organ: Bone Internal Toxicity: High Annual Limit on Intake: 0.4 mCi Radiation Energy (MeV): Beta 2.273 (100%) [See Glossary for references.] See "Yttrium, elemental." ] See "Radiation, ionizing."

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