Department of Homeland Security, Customs and Border Protection (CBP) is improving radiation scanning equipment used at many of our nation's ports of entry. Radiation portal monitors (RPM) now better detect radiological threats while alarming much less frequently on nonthreatening materials, resulting in big savings. The improvements, known as Revised Operational Settings (ROS), are being implemented during the annual calibrations of radiation portal monitors used to detect radiological threats in cargo and conveyances entering the U.S. through official ports of entry.