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Radionuclide Dosimetric Data Sheets
Technetium-104
Summary data
General
Classification
Isotope: Tc-104
Atomic number (Z): 43
Mass number (A): 104
Neutron number (N): 61
Radioactive decay
Decay modes: β-
Half-life: 18.3 [m]
Decay constant: 6.3128e-04 [1/s]
Daughters: Ru-104 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.60136 [MeV]
Mean photon energy: 2.24529 [MeV]
Air kerma rate constant, Γ10: 7.319e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.319e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.566e-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-:
2.566e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.597e-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-104 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-104 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-104 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-104 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.90944e-06 |
1.408e-01 |
X-ray |
|
1.60400e-01 |
1.869e-02 |
Gamma |
|
3.49300e-01 |
2.492e-02 |
Gamma |
|
3.58000e-01 |
8.900e-01 |
Gamma |
|
5.30500e-01 |
1.557e-01 |
Gamma |
|
5.35100e-01 |
1.469e-01 |
Gamma |
|
6.09500e-01 |
1.958e-02 |
Gamma |
|
6.14200e-01 |
1.157e-02 |
Gamma |
|
7.92500e-01 |
2.492e-02 |
Gamma |
|
8.84400e-01 |
1.095e-01 |
Gamma |
|
8.93100e-01 |
1.023e-01 |
Gamma |
|
1.15740e+00 |
2.848e-02 |
Gamma |
|
1.28180e+00 |
2.047e-02 |
Gamma |
|
1.38050e+00 |
1.691e-02 |
Gamma |
|
1.39660e+00 |
2.403e-02 |
Gamma |
|
1.54130e+00 |
1.068e-02 |
Gamma |
|
1.59670e+00 |
4.183e-02 |
Gamma |
|
1.61240e+00 |
5.785e-02 |
Gamma |
|
1.67680e+00 |
7.832e-02 |
Gamma |
|
1.73690e+00 |
1.869e-02 |
Gamma |
|
1.91100e+00 |
1.958e-02 |
Gamma |
|
1.97110e+00 |
1.602e-02 |
Gamma |
|
2.01570e+00 |
1.780e-02 |
Gamma |
|
2.12380e+00 |
2.225e-02 |
Gamma |
|
2.19050e+00 |
1.780e-02 |
Gamma |
|
2.46550e+00 |
1.157e-02 |
Gamma |
|
2.60850e+00 |
1.602e-02 |
Gamma |
|
3.14920e+00 |
1.157e-02 |
Gamma |
|
7.99175e-01 |
1.001e-02 |
Beta |
|
8.34289e-01 |
2.253e-02 |
Beta |
|
8.36907e-01 |
4.201e-02 |
Beta |
|
8.63718e-01 |
1.564e-02 |
Beta |
|
1.03441e+00 |
1.234e-02 |
Beta |
|
1.15207e+00 |
1.681e-02 |
Beta |
|
1.18183e+00 |
1.216e-02 |
Beta |
|
1.24295e+00 |
1.850e-02 |
Beta |
|
1.24813e+00 |
1.323e-02 |
Beta |
|
1.29276e+00 |
3.334e-02 |
Beta |
|
1.30899e+00 |
4.291e-02 |
Beta |
|
1.31277e+00 |
2.896e-02 |
Beta |
|
1.33736e+00 |
1.269e-02 |
Beta |
|
1.38491e+00 |
1.976e-02 |
Beta |
|
1.40578e+00 |
1.698e-02 |
Beta |
|
1.41340e+00 |
4.112e-02 |
Beta |
|
1.50258e+00 |
1.412e-02 |
Beta |
|
1.52441e+00 |
8.850e-02 |
Beta |
|
1.55498e+00 |
3.844e-02 |
Beta |
|
1.77148e+00 |
2.682e-02 |
Beta |
|
1.77758e+00 |
3.039e-02 |
Beta |
|
1.90169e+00 |
5.900e-02 |
Beta |
|
2.06854e+00 |
8.939e-02 |
Beta |
|
2.07074e+00 |
5.721e-02 |
Beta |
|
2.32448e+00 |
1.609e-01 |
Beta |
|
3.14594e-05 |
5.836e-02 |
Auger electron |
|
1.14432e-04 |
1.321e-02 |
Auger electron |
|
2.31858e-04 |
3.235e-02 |
Auger electron |
|
2.15877e-03 |
1.269e-02 |
Auger electron |
|
3.35913e-01 |
1.157e-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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