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CHROMIUM - 51
(51Cr)
| Physical Half-life: | 27.8 days |
| Radiations: | Gamma/x320 (9.8%) & 5
(22%) keV |
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| External Exposure: |
External hazard when mCi quantities are present. Radiation exposures from
1.0 mCi are 6.4 mR/hr and 1.6 mR/hr at 5 cm & 10 cm, respectively.
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| Biological Data: |
ALI | 40 mCi (ingestion), 52
mCi (inhalation) |
| Biological half-life |
616 days |
| Effective half-life |
26.6 days |
| Critical Organs |
Lower Large Intestine and Kidneys |
| Bioassay |
Urinalysis (Not routinely done) |
| Shielding: |
HVL 1.7 cm of lead; TVL 5.6 cm of lead. |
Monitoring
& Efficiency |
LSC (Eff. ~30%)
NaI Gamma Counter (Eff. ~1-2%) |
Special Considerations
- Use forceps with rubber sleeves to handle unshielded sources and
potentially contaminated vessels and work at arms length.
- Always store 51Cr vials in lead containers or behind
shields.
- Wear a radiation badge when handling 1.0 mCi or more.
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