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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
SODIUM-22 (Na-22)
Sodium-22 is a positron emitter (positive beta particle/electron)
and high-energy gamma emitter. It also emits an annihilation
photon when the positive electron is annihilated with a negative
electron, producing pure energy.
Sodium-22 is detected with a thin-window G-M probe, sodium-
iodide scintillation counter, or liquid scintillation detector.
Energy:
1.
o
Maximum beta energy: 0.546 MeV, average
energy 0.182 MeV.
o
Gamma energy: 1.275 MeV.
o
Annihilation photon: 0.511 MeV.
2.
Maximum beta range in air: 4.7 feet (1.4 m).
3.
Unshielded dose rate from 1mCi point source at
inch (1cm): 11.8 rad/hr.
4.
IAEA toxicity classification: High-medium.
Physical half-life: 950 days.
5.
6.
Effective half-life (Teff): 10.9 days.
7.
Critical organ:
o
Whole body for intake of transportable
compounds.
A-6
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