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DOE-HDBK-1106-97
IRON-55 (Fe-55)
Iron-55 decays by electron capture and is an X-ray emitter. Fe-55 contamination may be detected
by a thin-window G-M probe looking at the very low-energy characteristic Mn-55 X-rays.
Manganese is formed when the iron nucleus captures an electron. The manganese emits X-rays
characteristic to its electron shell structure. Liquid scintillation counting may also be used.
1. Average X-ray energy: Electron capture with an average low energy of 0.006 MeV.
2. IAEA toxicity classification: Medium-low.
3. Physical half-life: 2.6 years.
4. Effective half-life (Teff): 370 days.
5. Critical organ:
Liver and spleen for inhalation.
Lower large intestine for ingestion.
6. Personnel monitoring: Uptakes evaluated by analysis of blood.
7. ALI:
2 mCi (7 x 107 Bq) by inhalation, daily clearance.
9 mCi (3 x 108 Bq) by ingestion.
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