After years of experience in radioactivity detection and R&D, Dr. Lee invented DynamicFlow™ technology (US Patent No. US7624626B2, WIPO: WO2007059363A3) to further improve detection sensitivity. Rather than stop the flow of LC, the flow of cocktail and/or LC can be regulated so that the overall sensitivity of the online radioactivity detection is improved. The ARC XFlow™ System combined DynamicFlow™ and StopFlow™ into a single instrument. XFlow and StopFlow were installed to improve an existing radioactivity flow detector’s sensitivity.