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Radionuclide Dosimetric Data Sheets
Lanthanum-135
Summary data
General
Classification
Isotope: La-135
Atomic number (Z): 57
Mass number (A): 135
Neutron number (N): 78
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 19.5 [h]
Decay constant: 9.8739e-06 [1/s]
Daughters: Ba-135 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00669 [MeV]
Mean photon energy: 0.03607 [MeV]
Air kerma rate constant, Γ10: 4.177e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.180e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.072e-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-:
1.072e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.779e-15
[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-135 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-135 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-135 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-135 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.86001e-05 |
1.338e+01 |
X-ray |
|
4.45292e-03 |
4.203e-02 |
X-ray |
|
4.82366e-03 |
2.475e-02 |
X-ray |
|
3.18187e-02 |
2.195e-01 |
X-ray |
|
3.22056e-02 |
4.042e-01 |
X-ray |
|
3.63167e-02 |
3.863e-02 |
X-ray |
|
3.63920e-02 |
7.486e-02 |
X-ray |
|
3.72607e-02 |
1.590e-02 |
X-ray |
|
4.80510e-01 |
1.520e-02 |
Gamma |
|
1.08630e-05 |
2.855e+00 |
Auger electron |
|
2.91100e-05 |
2.367e-02 |
Auger electron |
|
4.69848e-05 |
1.658e+00 |
Auger electron |
|
4.88237e-05 |
4.527e+00 |
Auger electron |
|
1.14467e-04 |
6.559e-01 |
Auger electron |
|
3.43388e-04 |
1.346e-01 |
Auger electron |
|
5.52332e-04 |
1.477e+00 |
Auger electron |
|
6.90766e-04 |
1.088e-01 |
Auger electron |
|
3.57010e-03 |
5.794e-01 |
Auger electron |
|
4.33674e-03 |
1.852e-01 |
Auger electron |
|
5.13365e-03 |
1.447e-02 |
Auger electron |
|
2.63448e-02 |
5.382e-02 |
Auger electron |
|
3.09583e-02 |
2.483e-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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