This standard specifies the performance requirements and tests for transportable and mobile radiation monitors that detect and identify radionuclides@ and when provided@ indicate the presence of neutron radiation. Transportable radiation monitors are designed to be transported to a location and used for a specific task or for a specified period of time; they do not require permanent mounting platforms; may be mounted to a vehicle such as a trailer; and are only used when the vehicle is stationary. Mobile radiation monitors are typically in operation on a platform that is in motion but that can also be used while stationary. Mobile monitors may be mounted in vehicles including@ for example@ trailers. Purpose This standard specifies the operational and performance requirements for transportable and mobile radiation monitors used in homeland security applications. Operational requirements established by this standard include radiation detection and radionuclide identification@ and those requirements associated with the expected electrical@ mechanical@ and environmental conditions while in transit and when deployed. The tests described in this standard provide a means to help ensure that a monitor meets the requirements stated.