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Chromium 51

Gamma Max Half Life
0.3151MeV Mean energy 27.7025 days
0.3196MeV 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 400 MBq
  • If handled at distances of less than 10 cm 4 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

3.1 x 10-11 Sv.Bq-1 1μm AMAD, medium clearance time

3.8 x 10-11 Sv.Bq-1


1.22 x 10-13 Gy.s-1 per Bq.cm-2



Classification

If the total quantity of chromium-51 in the form of vapour in the laboratory is over 450 MBq*, it is necessary to classify the laboratory as a controlled area.

If the total quantity of chromium-51 in the laboratory is over 190 MBq, it necessary to classify the laboratory as a supervised area.

*450MBq vapour if inhaled would give rise to an effective dose of 15 mSv.