Radioisotope Information: SODIUM - 22
(22Na)
| Physical Half-life: | 2.6 years | |
| Radiations: | +ß 546 keV Gamma/x 511(180%) & 1275 keV |
|
| External Exposure: | External hazard. Radiation dose from 1 mCi of 22Na is 128.6 mR/hr from gamma/x and 5168 mRads/hr from +ß at 10 cm away. | |
| Biological Data: | ALI | 0.4 mCi (ingestion), 0.6 mCi (inhalation) |
| Biological half-life | 11 days | |
| Effective half-life | 11 days | |
| Critical Organs | Whole body and gastrointestinal tract | |
| Bioassay | Urinalysis (Not routinely done.) | |
| Shielding: | HVL 0.7 cm of lead; TVL 2.79 cm of lead | |
| Monitoring & Efficiency |
LSC (Eff. ~90%) NaI Gamma Counter (Eff. 30-60%) Thin-window GM (Eff. ~20%) |
Special Considerations
- Use forceps with rubber sleeves to handle unshielded sources and potentially contaminated vessels, and work at arms length.
- Near a 22Na source, beta radiation doses can be much higher than the gamma dose.
- Shielding the high energy gamma radiation with lead will also stop all of the ß's and Bremstralung radiation.
- Always store 22Na vials in lead containers or behind shields.
- Wear a radiation badge when handling 1.0 mCi or more.
For additional information contact the Radiation Safety Program at 229-4275.
Updated March 4, 2008 by SAK