Radiation Technology Information System (RATIS) is an integrated management system that provides information on support policies and R&D, recent trends, statistics, and market data related to industries that promote and use radiation. Customers' demands for IT services from information systems have increased with recent advancements in information technology (IT). To deliver satisfying services to users through a standardized process, RATIS has implemented ISO/IEC 20000-1, an international standard certification in IT service management. ISO/IEC 20000-1, an international standard that defines the requirements of IT service management systems, is a certificate system that continuously improves the quality of IT services and delivers high-quality services to interested parties, including customers. Meeting the requirements of ISO/IEC 20000-1, RATIS has defined the processes of service management and established an IT service management system model for content management and IT system operation. In contrast with existing IT service management systems that only focus on the management of IT systems, RATIS has differentiated itself by including content management, the core of system management, in its certification scope. In this paper, we will introduce the ISO/IEC 20000-1 certification and analyze the RATIS's IT service management system model and processes for the providing and utilization of top-quality radiation technology information services.