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Radionuclide Dosimetric Data Sheets

Lanthanum-142

Isotope:  La-142
Atomic number (Z):  57
Mass number (A):  142
Neutron number (N):  85

Decay modes:  β-
Half-life:  91.1 [m]
Decay constant:  1.2681e-04 [1/s]
Daughters:  Ce-142 (100.0%)
Radioactive daughters:  None

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.86966 [MeV]
Mean photon energy:  2.37378 [MeV]
Air kerma rate constant, Γ₁₀:  7.245e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  7.245e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.393e-13 [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-:  1.393e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  3.803e-13 [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-142 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-142 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-142 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-142 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.61297e-05	8.377e-02	X-ray
5.78090e-01	1.327e-02	Gamma
6.41285e-01	4.740e-01	Gamma
8.61600e-01	1.659e-02	Gamma
8.94900e-01	8.342e-02	Gamma
1.01140e+00	3.934e-02	Gamma
1.04370e+00	2.702e-02	Gamma
1.16020e+00	1.706e-02	Gamma
1.23310e+00	1.896e-02	Gamma
1.36300e+00	2.133e-02	Gamma
1.54580e+00	2.986e-02	Gamma
1.72270e+00	1.517e-02	Gamma
1.75640e+00	2.702e-02	Gamma
1.90130e+00	7.157e-02	Gamma
2.05520e+00	2.180e-02	Gamma
2.10040e+00	1.043e-02	Gamma
2.18720e+00	3.697e-02	Gamma
2.39780e+00	1.327e-01	Gamma
2.54270e+00	1.000e-01	Gamma
2.66680e+00	1.801e-02	Gamma
2.97100e+00	3.128e-02	Gamma
1.38762e-01	1.509e-02	Beta
2.58219e-01	1.006e-02	Beta
2.74429e-01	1.207e-02	Beta
2.85106e-01	1.107e-02	Beta
2.91080e-01	1.710e-02	Beta
2.99367e-01	5.031e-02	Beta
3.60625e-01	1.207e-02	Beta
3.75461e-01	1.207e-02	Beta
3.76855e-01	2.113e-02	Beta
4.20944e-01	1.308e-02	Beta
4.24656e-01	1.006e-02	Beta
4.76663e-01	1.006e-02	Beta
6.86831e-01	6.741e-02	Beta
7.00021e-01	3.119e-02	Beta
7.55155e-01	1.741e-01	Beta
8.19995e-01	1.791e-01	Beta
8.35239e-01	1.509e-02	Beta
9.15084e-01	3.220e-02	Beta
9.98214e-01	1.610e-02	Beta
1.62769e+00	1.610e-02	Beta
1.90428e+00	1.640e-01	Beta
1.22653e-05	1.189e-02	Auger electron
6.24562e-05	1.296e-02	Auger electron
7.40126e-05	2.809e-02	Auger electron
6.26520e-04	1.041e-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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