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Radionuclide Dosimetric Data Sheets
Cesium-140
Summary data
General
Classification
Isotope: Cs-140
Atomic number (Z): 55
Mass number (A): 140
Neutron number (N): 85
Radioactive decay
Decay modes: β-
Half-life: 63.7 [s]
Decay constant: 1.0881e-02 [1/s]
Daughters: Ba-140 (100.0%)
Radioactive daughters: Ba-140
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.93612 [MeV]
Mean photon energy: 1.76923 [MeV]
Air kerma rate constant, Γ10: 5.585e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.585e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.102e-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-:
3.102e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.835e-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-140 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-140 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-140 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-140 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.85958e-05 |
5.666e-02 |
X-ray |
|
5.28250e-01 |
2.898e-02 |
Gamma |
|
6.02350e-01 |
5.250e-01 |
Gamma |
|
6.72100e-01 |
1.139e-02 |
Gamma |
|
9.08250e-01 |
8.557e-02 |
Gamma |
|
1.12965e+00 |
1.208e-02 |
Gamma |
|
1.12965e+00 |
1.208e-02 |
Gamma |
|
1.20030e+00 |
4.720e-02 |
Gamma |
|
1.22140e+00 |
2.363e-02 |
Gamma |
|
1.39125e+00 |
1.843e-02 |
Gamma |
|
1.63490e+00 |
2.515e-02 |
Gamma |
|
1.70740e+00 |
1.265e-02 |
Gamma |
|
1.85340e+00 |
3.465e-02 |
Gamma |
|
2.10170e+00 |
3.003e-02 |
Gamma |
|
2.23730e+00 |
2.940e-02 |
Gamma |
|
2.26830e+00 |
1.187e-02 |
Gamma |
|
2.33050e+00 |
3.685e-02 |
Gamma |
|
2.42960e+00 |
1.192e-02 |
Gamma |
|
2.52190e+00 |
3.202e-02 |
Gamma |
|
3.05330e+00 |
1.124e-02 |
Gamma |
|
8.37914e-01 |
1.480e-02 |
Beta |
|
8.57216e-01 |
1.184e-02 |
Beta |
|
8.86209e-01 |
2.861e-02 |
Beta |
|
9.41738e-01 |
1.677e-02 |
Beta |
|
1.03082e+00 |
4.538e-02 |
Beta |
|
1.36496e+00 |
5.228e-02 |
Beta |
|
1.47132e+00 |
3.255e-02 |
Beta |
|
1.55630e+00 |
2.959e-02 |
Beta |
|
1.59939e+00 |
1.184e-02 |
Beta |
|
1.68925e+00 |
2.664e-02 |
Beta |
|
1.88281e+00 |
1.578e-02 |
Beta |
|
2.02962e+00 |
3.650e-02 |
Beta |
|
2.45591e+00 |
1.480e-01 |
Beta |
|
2.73859e+00 |
3.640e-01 |
Beta |
|
1.08630e-05 |
1.210e-02 |
Auger electron |
|
4.88039e-05 |
1.916e-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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