scope:

This standard is applicable to portable, transportable or installed assemblies intended to measure environmental air kerma rates from 30 nGyh^-1 to 10 µ Gyh^-1 (3µ rad h^-1 to 1 mrad h^-1) due to X or gamma radiation of energy between at least 50 keV and 1.5 MeV. If the assembly is to be used to measure air kerma rates in the area surrounding a nuclear reactor producing 6 MeV radiation it will be necessary to determine the response at this energy. For the purpose of radiation protection these assemblies comprise at least: - a detection sub-assembly (e.g. ionization chamber, GM counter tube, scintillation detector, etc.); - a measuring sub-assembly including a display device, which may be connected together either rigidly or by means of a flexible cable or incorporated into a single assembly. The installed assembly may also comprise a continuous recorder (e.g. chart or magnetic cassette recorder or telemetry equipment). The requirements of this standard are also applicable to assemblies that use integration of the ionization current, count-rate, etc. to enable a mean air kerma rate to be indicated or determined. For the assemblies described above, this standard specifies general characteristics, general test procedures, radiation characteristics, electrical, mechanical, safety and environmental characteristics as well as the identification certificate.