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Tritium

Beta Max Beta Range Half Life
0.00568 MeV Mean energy 6 mm in air 12.32 years
0.01859 MeV 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, dose rate not reached
  • If handled at distances of less than 10 cm, dose rate not reached

Effective Dose Coefficients

Inhalation coefficient Ingestion coefficient Skin dose coefficient
1.85 x 10-11 Sv.Bq-1 – tritiated water 1.8 x 10-11 Sv.Bq-1 tritiated water 0.00 Gy.s-1 per Bq.cm-2
4.1 x 10-11 Sv.Bq-1 – organically bound# 4.2 x 10-11 Sv.Bq-1 organically bound  
1.85 x 10-15 Sv.Bq-1 – tritium gas

# It is recommended that an RBE of 2 is applied where significant quantities are used.

Classification

If the total quantity of organically bound tritium in the laboratory is over 350 MBq, it is necessary to classify the laboratory as a controlled area.

For tritiated water the laboratory should be classified for quantities greater than 800MBq.

If the total quantity of tritium in the laboratory is over 150 MBq it is necessary to classify the laboratory as a supervised area.

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