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Radionuclide Dosimetric Data Sheets
Cesium-134
Summary data
General
Classification
Isotope: Cs-134
Atomic number (Z): 55
Mass number (A): 134
Neutron number (N): 79
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 2.065 [y]
Decay constant: 1.0638e-08 [1/s]
Daughters: Ba-134 (100.0%), Xe-134 (0.0003%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16388 [MeV]
Mean photon energy: 1.55508 [MeV]
Air kerma rate constant, Γ10: 5.777e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.777e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.626e-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-:
2.626e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.492e-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-134 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-134 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-134 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-134 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.86010e-05 |
1.476e-01 |
X-ray |
|
4.75365e-01 |
1.486e-02 |
Gamma |
|
5.63246e-01 |
8.350e-02 |
Gamma |
|
5.69331e-01 |
1.538e-01 |
Gamma |
|
6.04721e-01 |
9.762e-01 |
Gamma |
|
7.95864e-01 |
8.553e-01 |
Gamma |
|
8.01953e-01 |
8.690e-02 |
Gamma |
|
1.16797e+00 |
1.789e-02 |
Gamma |
|
1.36519e+00 |
3.014e-02 |
Gamma |
|
2.30685e-02 |
2.726e-01 |
Beta |
|
1.23393e-01 |
2.504e-02 |
Beta |
|
2.10071e-01 |
7.018e-01 |
Beta |
|
1.08630e-05 |
3.149e-02 |
Auger electron |
|
4.69644e-05 |
1.824e-02 |
Auger electron |
|
4.88045e-05 |
4.997e-02 |
Auger electron |
|
5.52107e-04 |
1.637e-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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