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Carbon 14

Beta Beta Range Half Life
0.04945MeV Mean energy 24 cm in air 5730 years
0.15648MeV Max energy

In Use

The following quantities will give a dose rate of 2 mSv/h without shielding.

  • If handled at distances of 10 cm or more 100 MBq
  • If handled at distances of less than 10 cm 1 MBq

Note that these quantities may be handled for a maximum of 15 minutes per day, five days a week, before the dose rate to the fingers is exceeded.

Effective Dose Coefficients

Inhalation coefficient  Ingestion coefficient Skin dose coefficient
5.8 x 10-10 Sv.Bq-1 vapour 5.8 x 10-10 Sv.Bq-1 8.74 x 10-11 Gy.s-1 per Bq.cm-2
6.5 x 10-12 Sv.Bq-1 dioxide
8.0 x 10-13 Sv.Bq-1 monoxide

Classification

Classification is dependant on the form of the carbon-14.

If the total quantity of carbon-14 in the form of vapour in the laboratory is over 25 MBq*, it is necessary to classify the laboratory as a controlled area.

If the total quantity of carbon-14 in the laboratory is over 10MBq, it necessary to classify the laboratory as a supervised area.

*25MBq vapour if inhaled would give rise to an effective dose of 15mSv.