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Phosphorus 33

Beta Max Half Life
0.0764 MeV Mean energy 25.34 days
0.2485 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 90 MBq
  • If handled at distances of less than 10 cm 0.9 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

1.4 x 10-9 Sv.Bq-1 - 1μm AMAD, medium clearance time

2.4 x 10-10 Sv.Bq-1

2.35 x 10-10 Gy.s-1 per Bq.cm-2 


Classification

If the total quantity of phosphorus - 33 in the laboratory is over 10 MBq, it is necessary to classify the laboratory as a controlled area.

If the total quantity of phosphorus - 33 in the laboratory is over 4 MBq, it is necessary to classify the laboratory as a supervised area.

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