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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
COBALT-57 (Co-57)
Cobalt-57 is an X-ray emitter. Most common means of detection
is with a thin-window G-M probe.
1.
Maximum energy: X-ray radiation from 0.014 to
0.692 MeV (0.122 MeV emitted 85.5% of the time).
2.
IAEA toxicity classification: Medium-low.
Physical half-life: 270.9 days.
3.
Effective half-life (Teff): 9 days.
4.
Critical organ: Lower large intestine.
5.
Personnel monitoring: Dosimeter, uptakes may be
6.
evaluated by whole body counting.
7.
ALI:
0.7 mCi (3 x 107 Bq) by inhalation, yearly
o
clearance.
4 mCi (2 x 108 Bq) by ingestion.
o
Shielding: 3.2 mm of lead is the half value layer.
8.
A-22
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