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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
IODINE-125 (I-125)
Iodine-125 is a gamma and X-ray emitter. I-125 contamination
may be detected by a thin-window G-M probe or with liquid
scintillation counting.
1.
Maximum energy: 0.035 MeV gamma (6.5%),
0.027 MeV x-ray (112.5%) and 0.031 MeV x-ray
(25.4%).
2.
IAEA toxicity classification: Medium-high.
Physical half-life: 60 days.
3.
Effective half-life (Teff): 42 days.
4.
Critical organ: Thyroid gland.
5.
Personnel monitoring: Internal uptakes evaluated
6.
by thyroid scan.
7.
ALI:
0.06 mCi (2 x 106 Bq) by inhalation, daily
o
clearance.
0.04 mCi (1 x 106 Bq) by ingestion.
o
Shielding: 0.25 mm of lead is the half-value layer.
8.
9.
Other considerations for iodine compounds:
o
Volatilization of iodine (NaI) is the most
significant hazard.
A-25
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