scope:

This standard applies to installed exposure rate meters, warning assemblies and monitors, defined in Section One, and intended to measure the exposure rate due to X or gamma radiation of energy between 80 keV and 3 MeV for the purposes of radiation protection. This standard does not apply to assemblies used for reactor control. As regards rate meters used both for radiological safety purposes and as a part of the protective system of a reactor, such instruments should in the first instance fulfill the requirements for the reactor protection system (see IEC Publication 231, General Principles of Nuclear Reactor Instrumentation, and IEC Publication 231A, First supplement to Publication 231 (1967)). The assemblies considered in this standard comprise at least: - a detector sub-assembly (e.g. ionization chamber, Geiger-Müller counter tube, etc.); - a measuring sub-assembly, which may be fitted into a centralized panel, with signal outputs and contacts capable of activating alarm or other trip circuits for the purposes of radiation protection.