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Radionuclide Dosimetric Data Sheets

Barium-133m

Isotope:  Ba-133m
Atomic number (Z):  56
Mass number (A):  133
Neutron number (N):  77

Decay modes:  Electron capture, Internal transition
Half-life:  38.9 [h]
Decay constant:  4.9496e-06 [1/s]
Daughters:  Ba-133 (100.0%), Cs-133 (0.0096%)
Radioactive daughters:  Ba-133

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.22592 [MeV]
Mean photon energy:  0.06856 [MeV]
Air kerma rate constant, Γ₁₀:  5.032e-18 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  5.032e-18 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  3.620e-14 [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-:  3.620e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  1.098e-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/Ba-133m 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/Ba-133m Summary 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/Ba-133m Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.85892e-05	2.513e+01	X-ray
6.93196e-04	1.064e-02	X-ray
4.45292e-03	5.611e-02	X-ray
4.82366e-03	3.773e-02	X-ray
4.82860e-03	1.322e-02	X-ray
4.90381e-03	2.046e-02	X-ray
1.23270e-02	1.406e-02	Gamma
3.18187e-02	1.563e-01	X-ray
3.22056e-02	2.879e-01	X-ray
3.63167e-02	2.751e-02	X-ray
3.63920e-02	5.331e-02	X-ray
3.72607e-02	1.132e-02	X-ray
2.75925e-01	1.780e-01	Gamma
1.08630e-05	5.377e+00	Auger electron
2.91100e-05	4.457e-02	Auger electron
4.69182e-05	3.247e+00	Auger electron
4.91115e-05	8.432e+00	Auger electron
1.15176e-04	1.351e+00	Auger electron
3.82516e-04	5.330e-01	Auger electron
5.56046e-04	2.562e+00	Auger electron
6.99862e-04	1.913e-01	Auger electron
3.65472e-03	9.989e-01	Auger electron
4.43167e-03	3.216e-01	Auger electron
5.24602e-03	2.556e-02	Auger electron
6.36620e-03	7.099e-01	Conversion electron
6.69670e-03	6.410e-02	Conversion electron
7.08360e-03	1.476e-02	Conversion electron
1.12700e-02	1.626e-01	Conversion electron
1.23270e-02	4.402e-02	Conversion electron
2.63448e-02	3.833e-02	Auger electron
3.09583e-02	1.768e-02	Auger electron
2.38476e-01	6.034e-01	Conversion electron
2.69964e-01	1.122e-01	Conversion electron
2.70295e-01	2.382e-02	Conversion electron
2.70682e-01	5.075e-02	Conversion electron
2.74868e-01	4.226e-02	Conversion electron
2.75925e-01	1.137e-02	Conversion 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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