RT Journal Article SR Electronic T1 Additional Radiation Safety Concerns Involving Sodium Iodide-131 Capsules JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 289 OP 290 VO 23 IS 4 A1 Michael T. Hackett A1 Nicolaos Perdikaris A1 Theandres T. Ruffin YR 1995 UL http://tech.snmjournals.org/content/23/4/289.abstract AB 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.