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Radiation Safety Considerations for Post-Iodine-131 Hyperthyroid Therapy

Nuclear Medicine Department, William Beaumont Hospital, Royal Oak, Michigan

Correspondence: For reprints contact: Cheryl M. Culver, MS, Nuclear Medicine Department, William Beaumont Hospital, 3601 West Thirteen Mile Rd., Royal Oak, MI 48072.

ABSTRACT

The purpose of this study was to develop guidelines based on patient measurements as to when iodine-131- (¹³¹I) treated hyperthyroid patients may resume close personal contact. External exposure rates were measured on 59 patients using an ionization survey meter in the upright position. The initial measurement was recorded within 20 min post-dose administration at one meter. Exposure rates were measured 2–11 days post-dose administration at 1, 0.6, and 0.3 meters from the patient's thyroid. In the administered dose range of 3 to less than 12 mCi of ¹³¹I, all 40 patients measured 2.0 mR/hr at one meter on Day 0, and 25 patients (25/29) were 2.0 mR/hr at 0.6 meter on Days 2–4. Guidelines can be prepared based on the administered dose that are rational and in conformity with existing radiologic health standards.

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