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Radionuclide Dosimetric Data Sheets
Yttrium-87m
Summary data
General
Classification
Isotope: Y-87m
Atomic number (Z): 39
Mass number (A): 87
Neutron number (N): 48
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 13.37 [h]
Decay constant: 1.4401e-05 [1/s]
Daughters: Y-87 (98.4%), Sr-87 (1.57%)
Radioactive daughters: Y-87
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.07941 [MeV]
Mean photon energy: 0.30719 [MeV]
Air kerma rate constant, Γ10: 1.434e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.463e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.272e-14 [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-:
1.272e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.922e-14
[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-87m 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-87m 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-87m 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-87m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.29808e-06 |
2.633e+00 |
X-ray |
|
2.09354e-05 |
6.833e-02 |
X-ray |
|
1.48403e-02 |
3.538e-02 |
X-ray |
|
1.49185e-02 |
6.778e-02 |
X-ray |
|
1.67001e-02 |
1.023e-02 |
X-ray |
|
3.80790e-01 |
7.815e-01 |
Gamma |
|
5.11000e-01 |
1.500e-02 |
Annihilation photon |
|
1.36397e-05 |
1.904e-02 |
Auger electron |
|
2.02944e-05 |
1.465e+00 |
Auger electron |
|
7.49565e-05 |
1.899e-02 |
Auger electron |
|
9.45763e-05 |
4.490e-01 |
Auger electron |
|
9.61884e-05 |
2.003e-01 |
Auger electron |
|
1.00664e-04 |
4.142e-02 |
Auger electron |
|
1.31719e-04 |
1.652e-02 |
Auger electron |
|
1.66240e-03 |
1.888e-01 |
Auger electron |
|
1.82718e-03 |
1.890e-02 |
Auger electron |
|
1.26657e-02 |
3.639e-02 |
Auger electron |
|
1.45497e-02 |
1.265e-02 |
Auger electron |
|
3.63790e-01 |
1.711e-01 |
Conversion electron |
|
3.78435e-01 |
2.091e-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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