This standard specifies the operational and performance requirements for transportable and/or mobile radiation monitors used in homeland security applications. 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. Transportable monitors may be mounted to a vehicle such as a trailer@ and are only used when the vehicle is stationary. Mobile monitors are those systems that are typically in operation on a platform that is in motion but that can also be used while stationary. These monitors may be mounted in vehicles@ including water craft@ towed systems@ or those monitors mounted to cranes. Mobile monitors can also be those that are used while being carried by a person such as a backpack. Operational requirements established by this standard include radiation detection and radionuclide identification (if used)@ 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 ensure that a monitor meets the requirements stated. Successful completion of the radiation tests described in this standard should not be construed as an ability to successfully detect and identify all radionuclides in all environments. Other than backpack units@ this standard does not cover instruments that are hand-carried during use@ or those instruments addressed by ANSI N42.32@ ANSI N42.33@ ANSI N42.34@ ANSI N42.35@ and ANSI N42.38.1 This standard addresses instruments used within the United States@ but can be used as a basis for use elsewhere. Purpose This standard specifies the performance criteria and tests for transportable and/or mobile radiation monitors used for homeland security. 1 The ANSI N42 publications included in this clause are available from the Institute of Electrical and Electronics Engineers@ 445 Hoes Lane@ Piscataway@ NJ 08855-1331@ USA (http://standards.ieee.org/). For more information on references@ see Clause 2.