Examples of precaution requirements after treatments with 131-I: Hyperthyroidism*

	mCi (MBq) administered
	10 (370)	15 (555)	20 (740)	30 (1110)
Restricted periods
Nighttime restrictions
Sleep in a separate (6-feet separation) bed from adults for days^¶ shown.	3	6	8	11
Sleep in a separate bed from pregnant partners, infant, or child for days shown.	15	18	20	23
Daytime restrictions
You may return to work after days shown.	1	1	2	5
Maximize your distance (6 feet) from children and pregnant women for days shown.	1	1	2	5
Avoid extended time in public places for days shown.	1	1	1	3
Duration of safe travel by public transportation (bus, air, etc)^Δ
Travel time (hours) without exceeding regulatory dose limit
Day^¶ 0 (beginning with treatment)	5.9	3.9	2.9	2
Day 1	9.2	6.1	4.6	3.1
Day 2	13	8.7	6.5	4.3
Day 3	-	10.6	8	5.3

Examples should be modified to meet local and specific patient needs. These examples are based on dose rate of 0.17 mrem h^-1 mCi^-1 at 1 m, 500 mrem per year for family member and caregiver, 100 mrem for pregnant women, children, and the public, and occupancy factors for adults of 0.25 except for sleeping 0.33. Resumption of sleeping with a partner assumes a distance of 0.3 m.

131-I: sodium iodide.
* Assumes 50 percent uptake by thyroid, with effective T_1/2 of approximately 5 days.
¶ Day = 24-hour cycle.
Δ Assumes 100 mrem limit and 0.3 m distance.

Reproduced with permission from: The American Thyroid Association Taskforce on Radioiodine Safety. Radiation Safety in the Treatment of Patients with Thyroid Diseases by Radioiodine 131-I: Practice Recommendations of the American Thyroid Association. Thyroid 2011; 21:335. Copyright © 2011 Mary Ann Liebert Publishers.

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Examples of precaution requirements after treatments with 131-I: Hyperthyroidism*