90Y undergoes β− decay to zirconium-90 with a half-life of 64 hours and a decay energy of 2.28 MeV. It also produces 0.01% 1.7 MeV photons along the way. Interaction of the emitted electrons with matter can lead to Bremsstrahlung radiation, as used in SPECT imaging.
Yttrium-90 is a decay product of strontium-90 which makes up about 5% of the nuclear daughter isotopes when uranium is fissioned.[not in citation given] Yttrium-90 is produced by chemical high-purity separation from strontium-90, a fission product of uranium in nuclear reactors.
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