Printer Friendly PDF

Iron 55

Chemical Symbol: Fe-55 Half-Life: 2.744 years
Atomic Number: 26 Decay Constant: 0.252605 years-1
Mass Number: 55 (29 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 Fe-55

Energy (keV)

Intensity (%)
125.95

1.28 E -7

X-rays From Fe-55

Energy (keV)

Intensity (%) Assignment
0.556 0.037

Mn Ll

0.568

0.025 Mn Lh
0.637 0.028

Mn Lα2

0.637

0.25 Mn Lα1
0.640 0.0022

Mn Lβ6

0.648

0.19 Mn Lβ1
0.720 0.011

Mn Lβ4

0.720

0.017 Mn Lβ3
5.770 6.9E-06

Mn Kα3

5.888

8.5 Mn Kα2
5.899 16.9

Mn Kα1

6.490

1.01 Mn Kβ3
6.490 1.98

Mn Kβ1

6.536

0.00089 Mn Kβ5
6.539 8.5E-08

Mn Kβ4

Betas From Fe-55

End-Point Energy (keV)

Intensity (%)

105.43

1.3 E -7
231.38

100

 

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.