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Radionuclide Dosimetric Data Sheets
Molybdenum-93m
Summary data
General
Classification
Isotope: Mo-93m
Atomic number (Z): 42
Mass number (A): 93
Neutron number (N): 51
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 6.85 [h]
Decay constant: 2.8108e-05 [1/s]
Daughters: Mo-93 (99.9%), Nb-93 (0.12%)
Radioactive daughters: Mo-93
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.1045 [MeV]
Mean photon energy: 2.31827 [MeV]
Air kerma rate constant, Γ10: 8.350e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.350e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.674e-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-:
1.674e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.714e-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-93m 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-93m Summary 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-93m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.83032e-06 |
1.337e-02 |
X-ray |
|
6.84834e-06 |
3.924e+00 |
X-ray |
|
1.73355e-02 |
6.600e-02 |
X-ray |
|
1.74440e-02 |
1.258e-01 |
X-ray |
|
1.95554e-02 |
1.025e-02 |
X-ray |
|
1.95734e-02 |
1.995e-02 |
X-ray |
|
2.63062e-01 |
5.672e-01 |
Gamma |
|
6.84672e-01 |
9.968e-01 |
Gamma |
|
1.47711e+00 |
9.908e-01 |
Gamma |
|
2.73747e-05 |
1.816e+00 |
Auger electron |
|
1.03699e-04 |
6.645e-02 |
Auger electron |
|
1.07317e-04 |
3.480e-01 |
Auger electron |
|
1.76181e-04 |
8.273e-01 |
Auger electron |
|
1.95390e-03 |
3.335e-01 |
Auger electron |
|
2.20281e-03 |
4.722e-02 |
Auger electron |
|
1.47064e-02 |
5.031e-02 |
Auger electron |
|
1.69714e-02 |
1.863e-02 |
Auger electron |
|
2.43097e-01 |
2.940e-01 |
Conversion electron |
|
2.60216e-01 |
2.881e-02 |
Conversion electron |
|
2.60433e-01 |
3.320e-02 |
Conversion electron |
|
2.60541e-01 |
2.470e-02 |
Conversion electron |
|
2.62670e-01 |
1.633e-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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