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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
IODINE-131 (I-131)
Iodine-131 is a gamma, X-ray, and beta emitter. I-131
contamination may be detected by a thin-window G-M probe or
with liquid scintillation counting.
1.
Maximum beta energies: 0.248 - 0.606 MeV.
Note: gammas are by decreasing
Primary gamma energies: 0.364 MeV, 0.637 MeV,
2.
percentages.
and 0.284 MeV.
3.
IAEA toxicity classification: Medium-high.
Physical half-life: 8 days.
4.
Effective half-life (Teff): 7.6 days.
5.
Critical organ: Thyroid gland.
6.
Personnel monitoring: Dosimeter, thyroid scan for
7.
uptakes.
8.
ALI:
0.05 mCi (2 x 106 Bq) by inhalation, daily
o
clearance.
0.03 mCi (1 x 106 Bq) by ingestion.
o
Shielding: 2.3 mm of lead is the half-value layer.
9.
A-27
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