Additional Radiation Safety Concerns Involving Sodium Iodide-131 Capsules

Abstract

Objective: We studied the extent of ¹³¹I contamination within absorbent packets of activated carbon that are enclosed in one manufacturer’s packaging of ¹³¹I therapeutic capsules.

Methods: Iodine-131 activity within the absorbent packets of ten ¹³¹I capsules was measured 3–5 min after opening each container and over a one workday period.

Results: Initial ¹³¹1 activity of the absorbent packets ranged from 0.1% to 1.0% of the activity of the respective ¹³¹I capsules. Follow-up measurements demonstrated rapid release of ¹³¹I.

Conclusion: Absorbent packets used in the packaging of ¹³¹1 capsules are a source of ¹³¹I contamination. They must be handled and stored properly to minimize potential internal exposure to the nuclear medicine staff.