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Cobalt 57

Chemical Symbol: Co-57 Half-Life: 271.74 days
Atomic Number: 27 Decay Constant: 0.002551 days-1
Mass Number: 57 (30 neutrons) Decay Mode: Electron Capture
U.S. NRC Exempt Quantity Limit: 100 μCi (3700 kBq) IAEA Exempt Quantity Limit: 27 μCi (1000 kBq)

Gammas From Co-57

Energy (keV)

Intensity (%)

14.413

9.16
122.0614

85.6

136.4743

10.68
230.29

0.0004

339.54

0.0139
352.36

0.0132

366.75

0.0013
569.92

0.017

692.03

0.157
706.4

0.0253

X-rays From Co-57

Energy (keV)

Intensity (%) Assignment
0.615 0.068

Fe Ll

0.628

0.046 Fe Lh
0.705 0.062

Fe Lα2

0.705

0.56 Fe Lα1
0.708 0.0038

Fe Lβ6

0.717

0.42 Fe Lβ1
0.792 0.022

Fe Lβ4

0.792

0.034 Fe Lβ3
6.266 1.69E-05

Fe Kα3

6.391

16.4 Fe Kα2
6.404 32.6

Fe Kα1

7.058

1.99 Fe Kβ3
7.058 3.88

Fe Kβ1

7.108

0.00206 Fe Kβ5
7.112 2.20E-07

Fe Kβ4

Betas From Co-57

End-Point Energy (keV)

Intensity (%)

129.58

0.183
699.53

99.8


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.