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Radionuclide Dosimetric Data Sheets
Cesium-124
Summary data
General
Classification
Isotope: Cs-124
Atomic number (Z): 55
Mass number (A): 124
Neutron number (N): 69
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 30.8 [s]
Decay constant: 2.2505e-02 [1/s]
Daughters: Xe-124 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.99081 [MeV]
Mean photon energy: 1.1607 [MeV]
Air kerma rate constant, Γ10: 8.157e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.356e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.190e-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-:
3.190e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.860e-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/Cs-124 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-124 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/Cs-124 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/Cs-124 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.66176e-05 |
1.088e+00 |
X-ray |
|
2.94521e-02 |
2.008e-02 |
X-ray |
|
2.97812e-02 |
3.718e-02 |
X-ray |
|
3.54010e-01 |
2.400e-01 |
Gamma |
|
4.92550e-01 |
2.160e-02 |
Gamma |
|
5.11000e-01 |
1.829e+00 |
Annihilation photon |
|
9.14840e-01 |
2.400e-02 |
Gamma |
|
1.65112e+00 |
2.093e-02 |
Positron |
|
1.85038e+00 |
1.594e-02 |
Positron |
|
2.08408e+00 |
1.634e-01 |
Positron |
|
2.25292e+00 |
6.876e-01 |
Positron |
|
2.61838e-05 |
1.696e-01 |
Auger electron |
|
3.62427e-05 |
5.174e-01 |
Auger electron |
|
1.23740e-04 |
6.379e-02 |
Auger electron |
|
3.21415e-04 |
1.218e-02 |
Auger electron |
|
5.05156e-04 |
1.418e-01 |
Auger electron |
|
3.32517e-03 |
5.587e-02 |
Auger electron |
|
4.00244e-03 |
1.657e-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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