<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Yttrium-87
Summary data
General
Classification
Isotope: Y-87
Atomic number (Z): 39
Mass number (A): 87
Neutron number (N): 48
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 79.8 [h]
Decay constant: 2.4128e-06 [1/s]
Daughters: Sr-87m (100.0%)
Radioactive daughters: Sr-87m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00715 [MeV]
Mean photon energy: 0.44622 [MeV]
Air kerma rate constant, Γ10: 3.338e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.345e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.146e-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-:
1.146e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.149e-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-87 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-87 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-87 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-87 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.09352e-05 |
8.340e+00 |
X-ray |
|
1.79939e-03 |
1.492e-02 |
X-ray |
|
1.40549e-02 |
1.757e-01 |
X-ray |
|
1.41246e-02 |
3.373e-01 |
X-ray |
|
1.57867e-02 |
2.564e-02 |
X-ray |
|
1.57975e-02 |
4.998e-02 |
X-ray |
|
4.84805e-01 |
8.984e-01 |
Gamma |
|
1.36397e-05 |
2.325e+00 |
Auger electron |
|
7.49589e-05 |
2.318e+00 |
Auger electron |
|
9.39171e-05 |
9.846e-01 |
Auger electron |
|
1.00592e-04 |
2.124e-01 |
Auger electron |
|
1.09930e-04 |
1.124e-01 |
Auger electron |
|
1.57338e-03 |
9.690e-01 |
Auger electron |
|
1.71380e-03 |
8.617e-02 |
Auger electron |
|
1.20238e-02 |
2.008e-01 |
Auger electron |
|
1.37890e-02 |
6.804e-02 |
Auger 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)
<= Return to MIRDspec isotope database
