Phosphorus-33 is a low-energy beta emitter. Most common means of detection is with a thin-
window probe or liquid scintillation.
Maximum energy: 0.248 MeV; the average energy is 0.083 MeV.
Maximum range in air: 1.5 feet (0.5 m).
Maximum range in tissue: 1 mm.
IAEA toxicity classification: Medium-low.
Physical half-life: 24.4 days.
6. Effective half-life (Teff): 10-24 days.
7. Critical organ:
Bone for transportable compounds.
Lung and lower large intestine are critical organs for inhalation and ingestion,
8. Personnel monitoring: NOT detected with a dosimeter (thermoluminescent dosimeter
or film) dosimeter and finger rings, uptakes may be determined by urinalysis.
3 mCi (1 x 108 Bq) by inhalation, clearance in weeks.
6 mCi (2 x 108 Bq) by ingestion.
10. Shielding: 3mm of plexiglass (if needed).
11. Special considerations:
Detection of P-33 by radiation survey instruments requires special care due to the low
efficiency of detection.
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