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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Student's Guide
PHOSPHORUS-33 (P-33)
Phosphorus-33 is a low-energy beta emitter. Most common means of detection is with a thin-window
probe or liquid scintillation.
1.
Maximum energy: 0.248 MeV; the average energy is 0.083 MeV.
Maximum range in air: 1.5 feet (0.5 m).
2.
Maximum range in tissue: 1 mm.
3.
IAEA toxicity classification: Medium-low.
4.
Physical half-life: 24.4 days.
5.
Effective half-life (Teff): 10-24 days.
6.
7.
Critical organ:
o
Bone for transportable compounds.
o
Lung and lower large intestine are critical organs for inhalation and ingestion,
respectively.
8.
Personnel monitoring: NOT detected with a dosimeter (thermoluminescent dosimeter or
film) dosimeter and finger rings, uptakes may be determined by urinalysis.
9.
ALI:
3 mCi (1 x 108 Bq) by inhalation, clearance in weeks.
o
6 mCi (2 x 108 Bq) by ingestion.
o
Shielding: 3mm of plexiglass (if needed).
10.
11.
Special considerations:
Detection of P-33 by radiation survey instruments requires special care due to the low
efficiency of detection.
A-9
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