RADIONUCLIDE
DATA SHEET
BARIUM 133
Chemical Symbol:
Ba-133
Half-Life:
10.551 years
Atomic Number:
56
Decay Constant:
0.065695 years-1
Mass Number:
133 (77 neutrons)
Decay Mode:
Electron Capture
U.S. NRC Exempt Quantity Limit:
10 μCi (370 kBq)
IAEA Exempt Quantity Limit:
2.7 μCi (100 kBq)
Gammas From Ba-133
Energy (keV)
Intensity (%)
53.161
2.199
79.621
2.62
80.997
34.06
160.613
0.645
223.398
0.45
276.398
7.164
302.853
18.33
356.017
62.05
383.851
8.94
X-rays From Ba-133
Energy (keV)
Intensity (%)
Assignment
3.795
0.24
Cs Ll
4.142
0.11
Cs Lh
4.272
0.66
Cs Lα2
4.286
6
Cs Lα1
Page 1 of 3
4.62
3.8
Cs Lβ1
4.649
0.56
Cs Lβ4
4.717
0.93
Cs Lβ3
4.781
0.048
Cs Lβ6
4.934
1.19
Cs Lβ2
5.281
0.54
Cs Lγ1
5.542
0.15
Cs Lγ2
5.553
0.22
Cs Lγ3
30.27
0.00401
Cs Kα3
30.625
34.9
Cs Kα2
30.973
64.5
Cs Kα1
34.92
5.99
Cs Kβ3
34.987
11.6
Cs Kβ1
35.252
0.123
Cs Kβ5
35.818
3.58
Cs Kβ2
35.907
0.74
Cs Kβ4
Betas From Ba-133
End-point Energy (keV)
Intensity (%)
80.39
86
133.55
14
Page 2 of 3
Ba-133 Decay Scheme
Reference(s):
- Health Physics and Radiological Health, 4th Edition by Thomas E. Johnson PhD, Brian K. Birky Ph.D.
- National Nuclear Data Center database - http://www.nndc.bnl.gov/
- Table of Radioactive Isotopes (ToRI) database - http:/nucleardata.nuclear.lu.se/nucleardata/toi/
Prepared by:
Spectrum Techniques, LLC.
106 Union Valley Road
Oak Ridge, TN 37830
Phone: 865.482.9937
Fax: 865.483.0473
Email: [email protected]
Website: www.spectrumtechniques.com
Page 3 of 3