Science Gateway
Calcium - 45
Carbon - 14
Chromium - 51
Hydrogen - 3
Iodine - 125
Iron - 59
Manganese - 54
Phosphorus - 32
Phosphorus - 33
Sodium - 22
Sulfur - 35



Physical Half-life: 5730 years
Radiations:- 156 keV

External Exposure:Low energy , not external hazard, radiation badge not necessary.
Biological Data: ALI 2 mCi
Biological half-life 10 days
Effective half-life 10 days
Critical Organs Whole body and fat
Bioassay Urinalysis
Shielding: None is recommended. Range of in air is 10" and 0.010" in lucite.
& Efficiency
LSC (Eff. ~85%)
Thin-window GM (Eff. ~5%)

Special Considerations

  • Work with volatile forms or procedures that may produce volatile compounds, (i.e., 14CO2), must be done in a fume hood.
  • 14C has a long half-life, do not correct for radioactive decay.
  • Some 14C labeled compounds may penetrate the skin. Wear two pairs of gloves and change the outer layer frequently.
  • Use caution when handling 14C labeled halogenated acids. These penetrate the skin and give high radiation doses.
  • Most 14C compounds are rapidly metabolized and exhaled as 14CO2.
  • Do not cover the thin-window of your GM survey meter with a cap, plastic or parafilm; they will shield the detector and you will not be able to detect low energy beta emitters like 14C.