Yttrium, Radioactive

Radiation Limits / Potential

Half-life: 48 min /Yttrium-86m/
Half-life: 14.74 hrs /Yttrium-86/
Half-life: 3.24 hrs /Yttrium-90m/
Half-life: 2.67 days /Yttrium-90/
Half-life: 49.7 min /Yttrium-91m/
Half-life: 58.5 days /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
QUANTITIES OF NRC LICENSED MATERIAL REQUIRING LABELING
RADIONUCLIDE QUANTITY (uCi)
Yttrium-86 100
Yttrium-86m 1,000
Yttrium-87 100
Yttrium-88 10
Yttrium-90m 1,000
Yttrium-91m 1,000
Yttrium-91 10
Yttrium-92 100
Yttrium-93 100
Yttrium-94 1,000
Yttrium-95 1,000
ALI values have been established for individual radionuclides and are presented in Table 1 in Appendix B to PART 20.1001-20.2401. The ALI values for inhalation, presented in Column 2 in Table 1, correspond to a committed effective dose equivalent of 5 rems (0.05 Sv) or a committed dose equivalent of 50 rems (0.5 Sv) to any individual organ or tissue, whichever is more limiting. If the ALI value presented in Table 1 is limited by the 50-rem committed dose equivalent, the controlling organ is listed directly below the ALI value, and the stochastic ALI value based on the 5-rem committed effective dose equivalent is listed ... directly below the organ name. If a stochastic ALI is listed ... , that value should be used to calculate the committed effective dose equivalent.
OCCUPATIONAL VALUES FOR YTTRIUM-86
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 1E+3 3E+3 1E-6
Y, oxides and hydroxides - 3E+3 1E-6
OCCUPATIONAL VALUES FOR YTTRIUM-86m
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 2E+4 6E+4 2E-5
Y, oxides and hydroxides - 5E+4 8E-8
OCCUPATIONAL VALUES FOR YTTRIUM-87
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 2E+3 3E+3 1E-6
Y, oxides and hydroxides - 3E+3 1E-6
OCCUPATIONAL VALUES FOR YTTRIUM-88
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 1E+3 3E+2 1E-7
Y, oxides and hydroxides - 2E+2 1E-7
OCCUPATIONAL VALUES FOR YTTRIUM-90
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 4E+2 (Lower large intestine LLI) wall) 5E+2 7E+2 3E-7
Y, oxides and hydroxides - 6E+2 3E-7
OCCUPATIONAL VALUES FOR YTTRIUM-90m
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 8E+3 1E+4 5E-6
Y, oxides and hydroxides - 1E+4 5E-6
OCCUPATIONAL VALUES FOR YTTRIUM-91
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 5E+2 (LLI wall) 6E+2 2E+2 7E-8
Y, oxides and hydroxides - 1E+2 5E-8
OCCUPATIONAL VALUES FOR YTTRIUM-91m
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 1E+5 2E+5 1E-4
Y, oxides and hydroxides - 2E+5 7E-5
OCCUPATIONAL VALUES FOR YTTRIUM-92
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 3E+3 9E+3 4E-6
Y, oxides and hydroxides - 8E+3 3E-6
OCCUPATIONAL VALUES FOR YTTRIUM-93
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 1E+3 3E+3 1E-6
Y, oxides and hydroxides - 2E+3 1E-6
OCCUPATIONAL VALUES FOR YTTRIUM-94
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 2E+4 (Stomach wall) 3E+4 8E+4 3E-5
Y, oxides and hydroxides - 8E+4 3E-5
OCCUPATIONAL VALUES FOR YTTRIUM-95
CLASS ORAL Ingestion ALI (uCi) INHALATION ALI (uCi) INHALATION DAC (uCi/mL)
Y, all compounds except those given for Y 4E+4 (Stomach wall) 5E+4 2E+5 6E-5
Y, oxides and hydroxides - 1E+5 6E-5
EFFLUENT CONCENTRATIONS ESTABLISHED BY THE NRC FOR SOME YTTRIUM COMPOUNDS
RADIONUCLIDE CLASS EFFLUENT CONCENTRATIONS: Air (uCi/mL) EFFLUENT CONCENTRATIONS: Water (uCi/mL)
Yttrium-86m W, all compounds except those given for Y 8E-8 3E-4
Y, oxides and hydroxides 8E-8 -
Yttrium-86 w 5E-9 2E-5
Y 5E-9 -
Yttrium-87 W 5E-9 3E-5
Y 5E-9 -
Yttrium-88 W 3E-10 1E-5
Y 3E-10 -
Yttrium-90 W 9E-10 7E-6
Y 9E-10 -
Yttrium-90m W 2E-8 1E-4
Y 2E-8 -
Yttrium-91 W 2E-10 8E-6
Y 2E-10 -
Yttrium-91m W 3E-7 2E-3
Y 2E-7 -
Yttrium-92 W 1E-8 4E-5
Y 1E-8 -
Yttrium-93 W 4E-9 2E-5
Y 3E-9 -
Yttrium-94 W 1E-7 4E-4
Y 1E-7 -
Yttrium-95 W 2E-7 7E-4
Y 2E-7 -
Find more information on this substance at: Hazardous Substances Data Bank , TOXNET , PubMed