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Carbon 14

Chemical Symbol: C-14 Half-Life: 5700 years
Atomic Number: 6 Decay Constant: 0.000122 years-1
Mass Number: 14 (8 neutrons) Decay Mode: Beta
U.S. NRC Exempt Quantity Limit: 100 μCi (3700 kBq) IAEA Exempt Quantity Limit: 270 μCi (10000 kBq)

Betas From C-14

End-Point Energy (keV)

Intensity (%)




  • Health Physics and Radiological Health, 4th Edition by Thomas E. Johnson PhD, Brian K. Birky Ph.D.
  • National Nuclear Data Center database –
  • Table of Radioactive Isotopes (ToRI) database – http:/


Prepared by:

Spectrum Techniques, LLC.