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Radionuclide Dosimetric Data Sheets
Yttrium-90m
Summary data
General
Classification
Isotope: Y-90m
Atomic number (Z): 39
Mass number (A): 90
Neutron number (N): 51
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 3.19 [h]
Decay constant: 6.0358e-05 [1/s]
Daughters: Y-90 (100.0%), Zr-90 (0.0018%)
Radioactive daughters: Y-90
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04696 [MeV]
Mean photon energy: 0.63536 [MeV]
Air kerma rate constant, Γ10: 2.506e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.506e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.524e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
7.524e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.018e-13
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Y-90m DPK.csv
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Y-90m Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/Y-90m Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Y-90m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.29808e-06 |
1.507e+00 |
X-ray |
|
1.48403e-02 |
2.056e-02 |
X-ray |
|
1.49185e-02 |
3.940e-02 |
X-ray |
|
2.02530e-01 |
9.725e-01 |
Gamma |
|
4.79510e-01 |
9.074e-01 |
Gamma |
|
2.02946e-05 |
8.385e-01 |
Auger electron |
|
9.45699e-05 |
2.571e-01 |
Auger electron |
|
9.62103e-05 |
1.146e-01 |
Auger electron |
|
1.00525e-04 |
2.352e-02 |
Auger electron |
|
1.66235e-03 |
1.082e-01 |
Auger electron |
|
1.82709e-03 |
1.083e-02 |
Auger electron |
|
1.26657e-02 |
2.115e-02 |
Auger electron |
|
1.85530e-01 |
2.367e-02 |
Conversion electron |
|
4.62510e-01 |
7.569e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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