RADIONUCLIDE
DATA SHEET
COBALT 60
Chemical Symbol:
Co-60
Half-Life:
5.27 years
Atomic Number:
27
Decay Constant:
0.131527 years-1
Mass Number:
60 (33 neutrons)
Decay Mode:
Beta
U.S. NRC Exempt Quantity Limit:
1 μCi (37 kBq)
IAEA Exempt Quantity Limit:
2.7 μCi (100 kBq)
Gammas From Co-60
Energy (keV)
Intensity (%)
346.93
0.0076
826.06
0.0076
1173.237
99.9736
1332.501
99.9856
2158.57
0.00111
2505
2.0 E -6
X-rays From Co-60
Energy (keV)
Intensity (%)
Assignment
0.743
1.3E-05
Ni Ll
0.760
7.5E-06
Ni Lh
0.851
1.5E-04
Ni Lα1
0.851
1.6E-05
Ni Lα2
0.855
6.4E-07
Ni Lβ6
0.868
9.8E-05
Ni Lβ1
0.940
4.8E-06
Ni Lβ4
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0.940
7.2E-06
Ni Lβ3
7.325
5.6E-09
Ni Kα3
7.461
0.00343
Ni Kα2
7.478
0.0067
Ni Kα1
8.265
0.000413
Ni Kβ3
8.265
0.00081
Ni Kβ1
8.329
7.4E-07
Ni Kβ5
8.333
6.8E-11
Ni Kβ4
Betas From Co-60
End-Point Energy (keV)
Intensity (%)
318.13
99.925
665.26
0.022
1491.38
0.057
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Co-60 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
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