Yttrium, Radioactive

Other Properties

There are 44 isotopes yttrium that are recognized(1). Yttrium-89 is naturally occurring and is stable(2). Yttrium-76 through 88 and yttrium-90 through 107 are artificially produced and are radioactive(2).
Half-life: 48 min; decay mode: isomeric transition (99+ MeV), gamma energy intensity: positron annihilation radiation (511.006 keV); beta(+), gamma energy intensity: 0.0102 (isomeric transition) MeV%; electron capture, gamma energy intensity: 0.2080 MeV% /Yttrium-86m/
Half-life: 14.74 hrs; decay mode: beta(+) particle (5.24 MeV), gamma energy intensity: positron annihilation radiation (511.006 keV); electron capture, gamma energy intensity: 0.3070 MeV% /Yttrium-86/
Half-life: 3.24 hrs; decay mode: isomeric transition (99+ MeV), gamma energy intensity: 0.205 MeV%; beta(-) (0.002 MeV), gamma energy intensity: 0.4794 MeV% /Yttrium-90m/
Half-life: 49.7 min; decay mode: isomeric transition (0.555 MeV), gamma energy intensity: 0.5556 (isomeric transition) MeV% /Yttrium-91m/
Half-life: 58.5 days; decay mode: beta(-) particle (1.544 MeV), gamma energy intensity: 1.208 MeV% /Yttrium-91/
DECAY PATHWAY: Yttrium-86, half-life 14.74 hours, decays via electron capture (5.240 MeV) to strontium-86, half-life stable
DECAY PATHWAY: Yttrium-86m, half-life 48 minutes, decays via isomeric transition (99.31% 0.218 MeV) and electron capture (0.70%, 5.458 MeV) to strontium-86, half-life stable
DECAY PATHWAY: Yttrium-90, half-life 64.10 hours, decays via beta (-) emission (99.9989%, 2280 keV maximum, 933.7 keV average energy) to zirconium-90, half-life stable
DECAY PATHWAY: Yttrium-90m, half-life 3.19 hours, decays via isomeric transition (gamma emission (abs intensities): 97.3% 202.5 keV; 90.7% 479.5 keV) to zirconium-90, half-life stable
DECAY PATHWAY: Yttrium-91, half-life 58.51 days, decays via beta(-) emission (1.544 MeV) to zirconium-91, half-life stable
DECAY PATHWAY: Yttrium-91m, half-life 4.35 micro-seconds, decays via isomeric transition (3.167 Mev) to zirconium-91, half-life stable
Find more information on this substance at: Hazardous Substances Data Bank , TOXNET , PubMed