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Radionuclide Dosimetric Data Sheets
Lanthanum-140
Summary data
General
Classification
Isotope: La-140
Atomic number (Z): 57
Mass number (A): 140
Neutron number (N): 83
Radioactive decay
Decay modes: β-
Half-life: 1.678 [d]
Decay constant: 4.7807e-06 [1/s]
Daughters: Ce-140 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.53455 [MeV]
Mean photon energy: 2.30837 [MeV]
Air kerma rate constant, Γ10: 7.698e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.698e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.564e-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-:
8.564e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.698e-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-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/La-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/La-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/La-140 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.61308e-05 |
5.335e-01 |
X-ray |
|
3.47432e-02 |
1.108e-02 |
X-ray |
|
3.28762e-01 |
2.032e-01 |
Gamma |
|
4.32493e-01 |
2.900e-02 |
Gamma |
|
4.87021e-01 |
4.551e-01 |
Gamma |
|
7.51637e-01 |
4.331e-02 |
Gamma |
|
8.15772e-01 |
2.328e-01 |
Gamma |
|
8.67846e-01 |
5.505e-02 |
Gamma |
|
9.19550e-01 |
2.662e-02 |
Gamma |
|
9.25189e-01 |
6.897e-02 |
Gamma |
|
1.59621e+00 |
9.540e-01 |
Gamma |
|
2.52140e+00 |
3.463e-02 |
Gamma |
|
4.41770e-01 |
1.120e-01 |
Beta |
|
4.44150e-01 |
5.836e-02 |
Beta |
|
4.58811e-01 |
1.099e-02 |
Beta |
|
4.65927e-01 |
5.600e-02 |
Beta |
|
4.88006e-01 |
4.521e-01 |
Beta |
|
5.15376e-01 |
5.066e-02 |
Beta |
|
6.30107e-01 |
1.973e-01 |
Beta |
|
8.46820e-01 |
4.932e-02 |
Beta |
|
1.22653e-05 |
7.568e-02 |
Auger electron |
|
6.23735e-05 |
8.270e-02 |
Auger electron |
|
7.40165e-05 |
1.788e-01 |
Auger electron |
|
1.36007e-04 |
2.758e-02 |
Auger electron |
|
6.26310e-04 |
6.671e-02 |
Auger electron |
|
3.84112e-03 |
2.558e-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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