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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

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

 

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.