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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Student's Guide
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:
o
Liver and spleen for inhalation.
o
Lower large intestine for ingestion.
Personnel monitoring: Uptakes evaluated by analysis of blood.
6.
7.
ALI:
2 mCi (7 x 107 Bq) by inhalation, daily clearance.
o
9 mCi (3 x 108 Bq) by ingestion.
o
A-15
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