On August 26, 2014, the NRC issued a Notice of Violation to Diagnostic Imaging Centers for a Severity Level III violation involving the failure to ensure written directives are dated and signed by an authorized user before the administration of I-131 sodium iodide greater than 1.11 megabecquerels (30 microcuries) as required by 10 CFR 35.40(a). Specifically, on September 3, 2008, and December 8, 2010, the licensee failed to have a written directive dated and signed by an authorized user before the administration of 5 millicuries of I-131 sodium iodide. The written directives were signed by individuals who were not authorized users for this specific medical use.