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IRON - 59
(59Fe)
| Physical Half-life: | 44.5 days |
| Radiations: | ß-
466 (53%), 273 (45%) & 131 (1.4%) keV
Gamma 1291 (44%), 1099(56%), 192 (3%) & 142 (1%) keV |
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| External Exposure: | External hazard. Radiation dose
from 1 mCi of 59Fe is 64 mR/hr from gamma and 5100
mRads/hr from ß at 10 cm away. |
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| Biological Data: |
ALI | 0.8 mCi (ingestion), 0.3 mCi (inhalation) |
| Biological half-life |
700 days |
| Effective half-life |
42 days |
| Critical Organs |
Lower Large Intestine (ingestion)
Spleen and Lungs
(inhalation) |
| Bioassay |
Urinalysis (within 1st 24 hours)
Whole Body Counting
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| Shielding: |
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HVL 1.01 cm of lead; TVL 3.36 cm of
lead
(Shielding of betas is accomplished while shielding
for gammas.) |
Monitoring
& Efficiency |
LSC (Eff. ~60%)
Thin-window GM
(Eff. ~10%) |
Special Considerations
- Use forceps with rubber sleeves to handle unshielded sources and
potentially contaminated vessels, and work at arms length.
- Near a 59Fe 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 59Fe vials in lead containers or behind
shields.
- Wear a radiation badge when handling 1.0 mCi or more.
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