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Radionuclide Dosimetric Data Sheets
Technetium-91
Summary data
General
Classification
Isotope: Tc-91
Atomic number (Z): 43
Mass number (A): 91
Neutron number (N): 48
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.14 [m]
Decay constant: 3.6791e-03 [1/s]
Daughters: Mo-91 (99.3%), Mo-91m (0.698%)
Radioactive daughters: Mo-91, Mo-91m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.6985 [MeV]
Mean photon energy: 2.48465 [MeV]
Air kerma rate constant, Γ10: 4.750e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.346e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.721e-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-:
2.721e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.981e-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-91 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-91 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-91 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-91 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
6.84801e-06 |
7.252e-01 |
X-ray |
|
1.73355e-02 |
1.385e-02 |
X-ray |
|
1.74440e-02 |
2.639e-02 |
X-ray |
|
3.37500e-01 |
1.138e-02 |
Gamma |
|
4.83200e-01 |
1.074e-02 |
Gamma |
|
5.11000e-01 |
1.858e+00 |
Annihilation photon |
|
5.48700e-01 |
1.659e-02 |
Gamma |
|
8.11000e-01 |
5.056e-02 |
Gamma |
|
8.13900e-01 |
1.738e-02 |
Gamma |
|
8.44900e-01 |
1.201e-02 |
Gamma |
|
8.78400e-01 |
1.090e-02 |
Gamma |
|
9.02800e-01 |
1.596e-02 |
Gamma |
|
1.11110e+00 |
3.144e-02 |
Gamma |
|
1.36200e+00 |
4.313e-02 |
Gamma |
|
1.56490e+00 |
6.920e-02 |
Gamma |
|
1.60520e+00 |
7.821e-02 |
Gamma |
|
1.63990e+00 |
9.211e-02 |
Gamma |
|
1.90230e+00 |
6.004e-02 |
Gamma |
|
2.23380e+00 |
1.318e-02 |
Gamma |
|
2.45090e+00 |
1.364e-01 |
Gamma |
|
2.71640e+00 |
1.849e-02 |
Gamma |
|
2.78130e+00 |
3.176e-02 |
Gamma |
|
2.88780e+00 |
1.390e-02 |
Gamma |
|
1.03459e+00 |
1.959e-02 |
Positron |
|
1.08396e+00 |
3.527e-02 |
Positron |
|
1.11403e+00 |
7.935e-02 |
Positron |
|
1.21866e+00 |
1.274e-02 |
Positron |
|
1.23793e+00 |
1.861e-01 |
Positron |
|
1.33989e+00 |
1.078e-02 |
Positron |
|
1.49612e+00 |
2.449e-02 |
Positron |
|
1.62058e+00 |
2.743e-02 |
Positron |
|
1.63704e+00 |
2.351e-02 |
Positron |
|
1.65624e+00 |
4.409e-02 |
Positron |
|
1.75835e+00 |
2.253e-02 |
Positron |
|
2.40739e+00 |
4.311e-01 |
Positron |
|
2.73606e-05 |
3.359e-01 |
Auger electron |
|
1.06677e-04 |
6.389e-02 |
Auger electron |
|
1.06753e-04 |
1.414e-02 |
Auger electron |
|
1.76242e-04 |
1.531e-01 |
Auger electron |
|
1.95193e-03 |
6.099e-02 |
Auger electron |
|
1.47064e-02 |
1.056e-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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