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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
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.
Maximum energy: 0.248 MeV; the average energy
1.
is 0.083 MeV.
Maximum range in air: 1.5 feet (0.5 m).
2.
3.
Maximum range in tissue: 1 mm.
4.
IAEA toxicity classification: Medium-low.
Physical half-life: 24.4 days.
5.
6.
Effective half-life (Teff): 10-24 days.
7.
Critical organ:
o
Bone for transportable compounds.
o
Lung and lower large intestine are critical
organs for inhalation and ingestion,
respectively.
Personnel monitoring: NOT detected with a
8.
dosimeter (TLD or film) dosimeter and finger rings,
uptakes may be determined by urinalysis.
A-12
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