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Radionuclide Dosimetric Data Sheets
Molybdenum-90
Summary data
General
Classification
Isotope: Mo-90
Atomic number (Z): 42
Mass number (A): 90
Neutron number (N): 48
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 5.56 [h]
Decay constant: 3.4630e-05 [1/s]
Daughters: Nb-90 (100.0%)
Radioactive daughters: Nb-90
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.2107 [MeV]
Mean photon energy: 0.83314 [MeV]
Air kerma rate constant, Γ10: 3.626e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.617e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.376e-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-:
3.376e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.335e-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/Mo-90 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/Mo-90 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/Mo-90 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/Mo-90 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.83005e-06 |
2.018e+01 |
X-ray |
|
2.15729e-03 |
2.579e-02 |
X-ray |
|
2.25178e-03 |
1.224e-02 |
X-ray |
|
1.64814e-02 |
2.467e-01 |
X-ray |
|
1.65789e-02 |
4.710e-01 |
X-ray |
|
1.85728e-02 |
3.776e-02 |
X-ray |
|
1.85887e-02 |
7.354e-02 |
X-ray |
|
1.89096e-02 |
1.277e-02 |
X-ray |
|
4.27000e-02 |
2.176e-02 |
Gamma |
|
1.22370e-01 |
6.449e-01 |
Gamma |
|
1.62930e-01 |
5.983e-02 |
Gamma |
|
2.03130e-01 |
6.371e-02 |
Gamma |
|
2.57340e-01 |
7.770e-01 |
Gamma |
|
3.23200e-01 |
6.294e-02 |
Gamma |
|
4.45370e-01 |
5.983e-02 |
Gamma |
|
4.72200e-01 |
1.422e-02 |
Gamma |
|
5.11000e-01 |
5.120e-01 |
Annihilation photon |
|
9.41500e-01 |
5.517e-02 |
Gamma |
|
9.90200e-01 |
1.018e-02 |
Gamma |
|
1.27130e+00 |
4.118e-02 |
Gamma |
|
1.38740e+00 |
1.865e-02 |
Gamma |
|
1.45460e+00 |
1.865e-02 |
Gamma |
|
4.77861e-01 |
2.560e-01 |
Positron |
|
2.53077e-05 |
1.008e+01 |
Auger electron |
|
9.86067e-05 |
2.226e+00 |
Auger electron |
|
1.06930e-04 |
2.563e-01 |
Auger electron |
|
1.52898e-04 |
3.695e+00 |
Auger electron |
|
1.98278e-04 |
4.166e-02 |
Auger electron |
|
1.85292e-03 |
1.168e+00 |
Auger electron |
|
1.94072e-03 |
8.004e-01 |
Conversion electron |
|
2.07360e-03 |
1.495e-01 |
Auger electron |
|
2.30000e-03 |
1.320e-01 |
Conversion electron |
|
1.40095e-02 |
2.074e-01 |
Auger electron |
|
1.61428e-02 |
7.524e-02 |
Auger electron |
|
2.37520e-02 |
6.044e-02 |
Conversion electron |
|
1.03422e-01 |
3.004e-01 |
Conversion electron |
|
1.19694e-01 |
2.825e-02 |
Conversion electron |
|
1.20001e-01 |
1.238e-02 |
Conversion electron |
|
2.38392e-01 |
1.242e-01 |
Conversion electron |
|
2.54664e-01 |
1.294e-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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