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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Student's Guide
IRON-59 (Fe-59)
Iron-59 is a beta and gamma emitter that can create an external, an internal, and skin and eye hazard. Iron-
59 is detected with a thin-window end window G-M probe, solid scintillator, or liquid scintillation
counter.
1.
Maximum beta energies:
o
0.466 MeV, average energy is 0.155 MeV.
o
0.273 MeV, average energy is 0.091 MeV.
o
0.131 MeV, average energy is 0.044 MeV.
2.
Gamma energies:
o
1.292 MeV.
o
1.099 MeV.
o
0.192 MeV.
o
0.143 MeV.
Maximum range in air of beta: 45 inches (115 cm).
3.
4.
Unshielded dose rate from 1 mCi point source at 1/2 inch (1 cm): 6.18 rad/hr.
5.
IAEA toxicity classification: Medium-high.
6.
Physical half-life: 44.6 days.
7.
Effective half-life (Teff): 42 days.
8.
Critical organ:
o
Liver and spleen for inhalation.
o
Lower large intestine for ingestion.
A-17
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