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Radionuclide Dosimetric Data Sheets

Lanthanum-133

Isotope:  La-133
Atomic number (Z):  57
Mass number (A):  133
Neutron number (N):  76

Decay modes:  β+, Electron capture
Half-life:  3.912 [h]
Decay constant:  4.9218e-05 [1/s]
Daughters:  Ba-133 (100.0%)
Radioactive daughters:  Ba-133

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.05033 [MeV]
Mean photon energy:  0.16047 [MeV]
Air kerma rate constant, Γ₁₀:  6.439e-18 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  9.133e-18 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  8.064e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  8.064e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  2.571e-14 [Gy·kg/Bq·s]

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-133 DPK.csv

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-133 Summary Spectrum.csv

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-133 Beta Spectrum.csv

 

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-133 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.85908e-05	2.589e+01	X-ray
6.92519e-04	1.103e-02	X-ray
4.45292e-03	5.976e-02	X-ray
4.82366e-03	4.018e-02	X-ray
4.82860e-03	1.281e-02	X-ray
4.90381e-03	1.982e-02	X-ray
1.23270e-02	1.347e-02	Gamma
3.18187e-02	2.058e-01	X-ray
3.22056e-02	3.789e-01	X-ray
3.63167e-02	3.621e-02	X-ray
3.63920e-02	7.016e-02	X-ray
3.72607e-02	1.490e-02	X-ray
2.78835e-01	2.480e-02	Gamma
2.90060e-01	1.401e-02	Gamma
3.02353e-01	1.634e-02	Gamma
5.11000e-01	1.392e-01	Annihilation photon
4.60451e-01	6.872e-02	Positron
1.08630e-05	5.537e+00	Auger electron
2.91100e-05	4.590e-02	Auger electron
4.69104e-05	3.332e+00	Auger electron
4.90864e-05	8.694e+00	Auger electron
1.15188e-04	1.379e+00	Auger electron
3.80469e-04	5.239e-01	Auger electron
5.55670e-04	2.660e+00	Auger electron
6.98953e-04	1.983e-01	Auger electron
3.64712e-03	1.039e+00	Auger electron
4.42313e-03	3.342e-01	Auger electron
5.23595e-03	2.652e-02	Auger electron
6.36620e-03	6.802e-01	Conversion electron
6.69670e-03	6.142e-02	Conversion electron
7.08360e-03	1.414e-02	Conversion electron
1.12700e-02	1.558e-01	Conversion electron
1.23270e-02	4.217e-02	Conversion electron
2.63448e-02	5.045e-02	Auger electron
3.09583e-02	2.327e-02	Auger electron

 

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

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

 

 

 

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