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Radionuclide Dosimetric Data Sheets
Cesium-130m
Summary data
General
Classification
Isotope: Cs-130m
Atomic number (Z): 55
Mass number (A): 130
Neutron number (N): 75
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 3.46 [m]
Decay constant: 3.3389e-03 [1/s]
Daughters: Cs-130 (99.8%), Xe-130 (0.16%)
Radioactive daughters: Cs-130
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09373 [MeV]
Mean photon energy: 0.07368 [MeV]
Air kerma rate constant, Γ10: 6.157e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.157e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.502e-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-:
1.502e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.180e-14
[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/Cs-130m 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/Cs-130m 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/Cs-130m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.66177e-05 |
1.993e-02 |
X-ray |
|
2.18853e-05 |
2.230e+01 |
X-ray |
|
6.46432e-04 |
1.054e-02 |
X-ray |
|
4.27312e-03 |
7.729e-02 |
X-ray |
|
4.61550e-03 |
5.028e-02 |
X-ray |
|
4.92286e-03 |
1.178e-02 |
X-ray |
|
3.06218e-02 |
2.511e-01 |
X-ray |
|
3.09789e-02 |
4.636e-01 |
X-ray |
|
3.49256e-02 |
4.392e-02 |
X-ray |
|
3.49944e-02 |
8.514e-02 |
X-ray |
|
3.58172e-02 |
1.801e-02 |
X-ray |
|
5.11800e-02 |
7.027e-02 |
Gamma |
|
8.04500e-02 |
3.462e-01 |
Gamma |
|
1.31500e-01 |
1.293e-02 |
Gamma |
|
1.48350e-01 |
5.092e-02 |
Gamma |
|
2.07154e-05 |
2.955e+00 |
Auger electron |
|
4.14118e-05 |
1.060e+01 |
Auger electron |
|
1.20223e-04 |
1.291e+00 |
Auger electron |
|
3.04288e-04 |
2.022e-01 |
Auger electron |
|
5.27895e-04 |
2.942e+00 |
Auger electron |
|
6.51596e-04 |
1.925e-01 |
Auger electron |
|
3.43896e-03 |
1.143e+00 |
Auger electron |
|
4.15857e-03 |
3.524e-01 |
Auger electron |
|
4.90566e-03 |
2.709e-02 |
Auger electron |
|
9.89390e-03 |
3.499e-02 |
Conversion electron |
|
1.39093e-02 |
1.088e-02 |
Conversion electron |
|
1.51950e-02 |
3.845e-01 |
Conversion electron |
|
2.53980e-02 |
6.585e-02 |
Auger electron |
|
2.61368e-02 |
1.740e-01 |
Conversion electron |
|
2.64939e-02 |
2.355e-01 |
Conversion electron |
|
2.98089e-02 |
2.993e-02 |
Auger electron |
|
3.05093e-02 |
1.000e-01 |
Conversion electron |
|
3.15000e-02 |
2.404e-02 |
Conversion electron |
|
4.44650e-02 |
5.085e-01 |
Conversion electron |
|
4.54951e-02 |
4.722e-02 |
Conversion electron |
|
4.69150e-02 |
7.378e-02 |
Conversion electron |
|
5.01893e-02 |
1.068e-02 |
Conversion electron |
|
7.47651e-02 |
6.253e-02 |
Conversion electron |
|
7.75368e-02 |
1.179e-01 |
Conversion electron |
|
7.78939e-02 |
1.281e-01 |
Conversion electron |
|
7.94593e-02 |
1.404e-02 |
Conversion electron |
|
8.19093e-02 |
5.764e-02 |
Conversion electron |
|
8.29000e-02 |
1.390e-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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