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Radionuclide Dosimetric Data Sheets
Lanthanum-132
Summary data
General
Classification
Isotope: La-132
Atomic number (Z): 57
Mass number (A): 132
Neutron number (N): 75
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.8 [h]
Decay constant: 4.0113e-05 [1/s]
Daughters: Ba-132 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.56931 [MeV]
Mean photon energy: 1.99523 [MeV]
Air kerma rate constant, Γ10: 5.425e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.076e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.121e-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-:
9.121e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.197e-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/La-132 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/La-132 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/La-132 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/La-132 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.86002e-05 |
7.875e+00 |
X-ray |
|
4.45292e-03 |
2.480e-02 |
X-ray |
|
4.82366e-03 |
1.460e-02 |
X-ray |
|
3.18187e-02 |
1.297e-01 |
X-ray |
|
3.22056e-02 |
2.389e-01 |
X-ray |
|
3.63167e-02 |
2.283e-02 |
X-ray |
|
3.63920e-02 |
4.423e-02 |
X-ray |
|
1.92600e-01 |
1.140e-02 |
Gamma |
|
4.64550e-01 |
7.600e-01 |
Gamma |
|
4.79470e-01 |
2.196e-02 |
Gamma |
|
5.11000e-01 |
8.530e-01 |
Annihilation photon |
|
5.15780e-01 |
5.016e-02 |
Gamma |
|
5.40363e-01 |
7.676e-02 |
Gamma |
|
5.67140e-01 |
1.573e-01 |
Gamma |
|
6.63070e-01 |
9.044e-02 |
Gamma |
|
8.99320e-01 |
4.636e-02 |
Gamma |
|
1.03170e+00 |
7.752e-02 |
Gamma |
|
1.04656e+00 |
3.405e-02 |
Gamma |
|
1.22123e+00 |
2.934e-02 |
Gamma |
|
1.53366e+00 |
1.474e-02 |
Gamma |
|
1.53366e+00 |
1.474e-02 |
Gamma |
|
1.60403e+00 |
3.648e-02 |
Gamma |
|
1.90991e+00 |
9.044e-02 |
Gamma |
|
2.10284e+00 |
5.852e-02 |
Gamma |
|
2.75473e+00 |
1.596e-02 |
Gamma |
|
5.05392e-01 |
1.714e-02 |
Positron |
|
5.90870e-01 |
1.512e-02 |
Positron |
|
1.19995e+00 |
1.210e-01 |
Positron |
|
1.46313e+00 |
1.412e-01 |
Positron |
|
1.67396e+00 |
9.276e-02 |
Positron |
|
1.08630e-05 |
1.680e+00 |
Auger electron |
|
2.91100e-05 |
1.393e-02 |
Auger electron |
|
4.69842e-05 |
9.753e-01 |
Auger electron |
|
4.88208e-05 |
2.664e+00 |
Auger electron |
|
1.14465e-04 |
3.855e-01 |
Auger electron |
|
3.42600e-04 |
7.844e-02 |
Auger electron |
|
5.52297e-04 |
8.699e-01 |
Auger electron |
|
6.90677e-04 |
6.406e-02 |
Auger electron |
|
3.56945e-03 |
3.412e-01 |
Auger electron |
|
4.33600e-03 |
1.091e-01 |
Auger electron |
|
2.63448e-02 |
3.180e-02 |
Auger electron |
|
3.09583e-02 |
1.467e-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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