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Radionuclide Dosimetric Data Sheets
Lanthanum-128
Summary data
General
Classification
Isotope: La-128
Atomic number (Z): 57
Mass number (A): 128
Neutron number (N): 71
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 5.18 [m]
Decay constant: 2.2302e-03 [1/s]
Daughters: Ba-128 (100.0%)
Radioactive daughters: Ba-128
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.33399 [MeV]
Mean photon energy: 2.82825 [MeV]
Air kerma rate constant, Γ10: 7.248e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.033e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.137e-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-:
2.137e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.531e-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-128 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-128 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-128 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-128 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.86005e-05 |
3.536e+00 |
X-ray |
|
4.45292e-03 |
1.116e-02 |
X-ray |
|
3.18187e-02 |
5.792e-02 |
X-ray |
|
3.22056e-02 |
1.067e-01 |
X-ray |
|
3.63167e-02 |
1.019e-02 |
X-ray |
|
3.63920e-02 |
1.975e-02 |
X-ray |
|
2.84100e-01 |
8.810e-01 |
Gamma |
|
3.86000e-01 |
1.595e-02 |
Gamma |
|
4.39900e-01 |
1.912e-02 |
Gamma |
|
4.79310e-01 |
5.136e-01 |
Gamma |
|
4.87900e-01 |
9.603e-02 |
Gamma |
|
4.93900e-01 |
1.092e-02 |
Gamma |
|
5.11000e-01 |
1.591e+00 |
Annihilation photon |
|
5.67000e-01 |
3.594e-02 |
Gamma |
|
6.00500e-01 |
9.603e-02 |
Gamma |
|
6.06900e-01 |
1.947e-02 |
Gamma |
|
6.09000e-01 |
7.585e-02 |
Gamma |
|
6.26000e-01 |
3.401e-02 |
Gamma |
|
6.32500e-01 |
5.489e-02 |
Gamma |
|
6.43600e-01 |
1.330e-01 |
Gamma |
|
7.74800e-01 |
1.163e-02 |
Gamma |
|
7.93500e-01 |
1.612e-02 |
Gamma |
|
8.84500e-01 |
7.136e-02 |
Gamma |
|
9.15000e-01 |
2.766e-02 |
Gamma |
|
9.38900e-01 |
2.343e-02 |
Gamma |
|
9.88600e-01 |
1.498e-02 |
Gamma |
|
1.00570e+00 |
1.022e-02 |
Gamma |
|
1.03630e+00 |
1.489e-02 |
Gamma |
|
1.04040e+00 |
9.074e-02 |
Gamma |
|
1.05315e+00 |
8.810e-02 |
Gamma |
|
1.07040e+00 |
4.202e-02 |
Gamma |
|
1.07900e+00 |
1.568e-02 |
Gamma |
|
1.08820e+00 |
7.709e-02 |
Gamma |
|
1.10090e+00 |
4.194e-02 |
Gamma |
|
1.12490e+00 |
1.031e-02 |
Gamma |
|
1.14380e+00 |
1.277e-02 |
Gamma |
|
1.14420e+00 |
1.568e-02 |
Gamma |
|
1.16800e+00 |
1.427e-02 |
Gamma |
|
1.17650e+00 |
1.066e-02 |
Gamma |
|
1.27610e+00 |
4.194e-02 |
Gamma |
|
1.30260e+00 |
1.189e-02 |
Gamma |
|
1.41230e+00 |
3.304e-02 |
Gamma |
|
1.44000e+00 |
1.392e-02 |
Gamma |
|
1.50590e+00 |
3.233e-02 |
Gamma |
|
1.54970e+00 |
1.383e-02 |
Gamma |
|
1.60540e+00 |
1.260e-02 |
Gamma |
|
1.91960e+00 |
1.022e-02 |
Gamma |
|
1.25246e+00 |
3.382e-02 |
Positron |
|
1.29857e+00 |
5.900e-02 |
Positron |
|
1.37160e+00 |
1.265e-02 |
Positron |
|
1.41524e+00 |
2.459e-02 |
Positron |
|
1.49721e+00 |
2.696e-02 |
Positron |
|
1.50930e+00 |
1.951e-01 |
Positron |
|
1.59292e+00 |
1.005e-02 |
Positron |
|
1.60811e+00 |
1.785e-02 |
Positron |
|
1.62625e+00 |
2.034e-02 |
Positron |
|
1.69016e+00 |
5.546e-02 |
Positron |
|
1.73733e+00 |
2.152e-02 |
Positron |
|
1.74104e+00 |
1.525e-02 |
Positron |
|
1.75225e+00 |
1.561e-02 |
Positron |
|
1.77745e+00 |
1.253e-02 |
Positron |
|
1.79318e+00 |
2.968e-02 |
Positron |
|
1.98871e+00 |
3.193e-02 |
Positron |
|
2.00515e+00 |
5.439e-02 |
Positron |
|
2.29480e+00 |
8.159e-02 |
Positron |
|
1.08630e-05 |
7.545e-01 |
Auger electron |
|
4.69718e-05 |
4.375e-01 |
Auger electron |
|
4.88148e-05 |
1.197e+00 |
Auger electron |
|
1.14522e-04 |
1.727e-01 |
Auger electron |
|
3.40496e-04 |
3.451e-02 |
Auger electron |
|
5.52228e-04 |
3.912e-01 |
Auger electron |
|
6.90491e-04 |
2.880e-02 |
Auger electron |
|
3.56856e-03 |
1.535e-01 |
Auger electron |
|
4.33493e-03 |
4.904e-02 |
Auger electron |
|
2.63448e-02 |
1.420e-02 |
Auger electron |
|
2.46651e-01 |
3.843e-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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