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Radionuclide Dosimetric Data Sheets

Barium-133

Summary data

General

Classification

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

Radioactive decay

Decay modes:  Electron capture
Half-life:  10.52 [y]
Decay constant:  2.0879e-09 [1/s]
Daughters:  Cs-133 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.05531 [MeV]
Mean photon energy:  0.40295 [MeV]
Air kerma rate constant, Γ10:  1.980e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.980e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  8.862e-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-:  8.862e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  6.456e-14 [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/Ba-133 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/Ba-133 Summary 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/Ba-133 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

2.18876e-05

2.094e+01

X-ray

4.27312e-03

6.779e-02

X-ray

4.61551e-03

4.037e-02

X-ray

4.92286e-03

1.033e-02

X-ray

3.06218e-02

3.474e-01

X-ray

3.09789e-02

6.416e-01

X-ray

3.49256e-02

6.079e-02

X-ray

3.49943e-02

1.178e-01

X-ray

3.58031e-02

1.279e-02

X-ray

3.58172e-02

2.493e-02

X-ray

5.31625e-02

2.199e-02

Gamma

7.96139e-02

2.620e-02

Gamma

8.09971e-02

3.406e-01

Gamma

2.76400e-01

7.164e-02

Gamma

3.02851e-01

1.833e-01

Gamma

3.56013e-01

6.205e-01

Gamma

3.83848e-01

8.940e-02

Gamma

2.11913e-05

2.822e+00

Auger electron

4.14902e-05

9.926e+00

Auger electron

1.19652e-04

1.253e+00

Auger electron

3.46121e-04

2.950e-01

Auger electron

5.29171e-04

2.684e+00

Auger electron

6.55055e-04

1.766e-01

Auger electron

3.46156e-03

1.052e+00

Auger electron

4.18475e-03

3.248e-01

Auger electron

4.93818e-03

2.509e-02

Auger electron

1.71775e-02

1.083e-01

Conversion electron

2.53980e-02

9.113e-02

Auger electron

2.98089e-02

4.141e-02

Auger electron

4.36289e-02

3.999e-02

Conversion electron

4.50121e-02

4.967e-01

Conversion electron

4.74776e-02

1.321e-02

Conversion electron

7.53122e-02

6.049e-02

Conversion electron

8.00064e-02

1.551e-02

Conversion electron

3.20028e-01

1.309e-02

Conversion 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

 

 

 

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