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Radionuclide Dosimetric Data Sheets
Lanthanum-138
Summary data
General
Classification
Isotope: La-138
Atomic number (Z): 57
Mass number (A): 138
Neutron number (N): 81
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 102000000000.0 [y]
Decay constant: 2.1534e-19 [1/s]
Daughters: Ba-138 (66.4%), Ce-138 (33.6%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03772 [MeV]
Mean photon energy: 1.23159 [MeV]
Air kerma rate constant, Γ10: 4.314e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.314e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.043e-15 [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-:
6.043e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.973e-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-138 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-138 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-138 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-138 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.61262e-05 |
1.353e-02 |
X-ray |
|
1.85945e-05 |
8.772e+00 |
X-ray |
|
4.45292e-03 |
2.770e-02 |
X-ray |
|
4.82366e-03 |
1.352e-02 |
X-ray |
|
3.18187e-02 |
1.108e-01 |
X-ray |
|
3.22056e-02 |
2.041e-01 |
X-ray |
|
3.63167e-02 |
1.950e-02 |
X-ray |
|
3.63920e-02 |
3.779e-02 |
X-ray |
|
7.88742e-01 |
3.360e-01 |
Gamma |
|
1.43580e+00 |
6.640e-01 |
Gamma |
|
9.55502e-02 |
3.360e-01 |
Beta |
|
1.08630e-05 |
1.873e+00 |
Auger electron |
|
2.91100e-05 |
1.553e-02 |
Auger electron |
|
4.71989e-05 |
1.097e+00 |
Auger electron |
|
4.88588e-05 |
2.960e+00 |
Auger electron |
|
1.13399e-04 |
4.395e-01 |
Auger electron |
|
3.59050e-04 |
9.755e-02 |
Auger electron |
|
5.52874e-04 |
9.577e-01 |
Auger electron |
|
6.92254e-04 |
7.076e-02 |
Auger electron |
|
3.56965e-03 |
3.729e-01 |
Auger electron |
|
4.33718e-03 |
1.192e-01 |
Auger electron |
|
2.63448e-02 |
2.717e-02 |
Auger electron |
|
3.09583e-02 |
1.253e-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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