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Radionuclide Dosimetric Data Sheets
Technetium-94m
Summary data
General
Classification
Isotope: Tc-94m
Atomic number (Z): 43
Mass number (A): 94
Neutron number (N): 51
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 52.0 [m]
Decay constant: 2.2216e-04 [1/s]
Daughters: Mo-94 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.75434 [MeV]
Mean photon energy: 1.95665 [MeV]
Air kerma rate constant, Γ10: 4.591e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.307e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.209e-13 [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-:
1.209e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.135e-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/Tc-94m 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/Tc-94m 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/Tc-94m 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/Tc-94m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
6.84801e-06 |
3.019e+00 |
X-ray |
|
1.73355e-02 |
5.759e-02 |
X-ray |
|
1.74440e-02 |
1.097e-01 |
X-ray |
|
1.95734e-02 |
1.741e-02 |
X-ray |
|
5.11000e-01 |
1.403e+00 |
Annihilation photon |
|
8.71050e-01 |
9.420e-01 |
Gamma |
|
9.93190e-01 |
2.214e-02 |
Gamma |
|
1.52210e+00 |
4.522e-02 |
Gamma |
|
1.86868e+00 |
5.746e-02 |
Gamma |
|
2.74010e+00 |
3.523e-02 |
Gamma |
|
3.12910e+00 |
1.385e-02 |
Gamma |
|
1.09400e+00 |
6.754e-01 |
Positron |
|
2.73604e-05 |
1.398e+00 |
Auger electron |
|
1.06668e-04 |
2.660e-01 |
Auger electron |
|
1.06787e-04 |
5.902e-02 |
Auger electron |
|
1.76244e-04 |
6.372e-01 |
Auger electron |
|
1.95195e-03 |
2.538e-01 |
Auger electron |
|
2.20124e-03 |
3.595e-02 |
Auger electron |
|
1.47064e-02 |
4.390e-02 |
Auger electron |
|
1.69714e-02 |
1.626e-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)
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