This document defines the performance requirements of installed monitors used for the detection of gamma and neutron radiation emitters. These monitors are commonly known as radiation portal monitors or RPMs. They are used to monitor vehicles, cargo containers, people, or packages and are typically located at national and international border crossings. They may be used at any location where there is a need for this type of monitoring. This document establishes the general, radiological, climatic, mechanical, electric and electromagnetic, and documentation requirements and associated test methods. A summary of the performance requirements is provided as Table 6. An informative listing of environmental requirements from IEC 62706 is provided as Table 7. This document does not apply to the performance of spectroscopy-based portal monitors covered in IEC 62484.