On November 30, 2006, a Notice of Violation was issued for a Severity Level III violation involving the failure to secure licensed material from unauthorized removal or access, and/or maintain constant surveillance of licensed material that was stored in a controlled or unrestricted area. Specifically, on August 2, 2006, an HDR unit containing Iridium-192 was left unsecured and unattended in that the door to the room housing the HDR was open and no staff member was in the immediate vicinity to maintain constant surveillance, contrary to 10 CFR 20.1801 and 10 CFR 20.1802.