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|  DOE-HDBK-1106-97
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.
3.
Physical half-life: 60 days.
4.
Effective half-life (Teff): 42 days.
5.
Critical organ: Thyroid gland.
6.
Personnel monitoring: Internal uptakes evaluated by
thyroid scan.
7.
ALI:
0.06 mCi (2 x 106 Bq) by inhalation, daily clearance.
0.04 mCi (1 x 106 Bq) by ingestion.
8.
Shielding: 0.25 mm of lead is the half-value layer.
9.
Other considerations for iodine compounds:
Volatilization of iodine (NaI) is the most significant
hazard.
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