|Number of pages||107|
IEC 61322 applies to installed dose equivalent rate meters, warning assemblies andmonitors, as defined below. It covers equipment intended to measure neutron radiation indose equivalent rates in the energy region between thermal and 20 MeV for the purposes ofradiation protection.Assemblies of this type are commonly defined as area radiation monitors. They are normallyemployed to determine continuously the radiological situation in working areas in which theradiation field may change with time, for example, nuclear power plants, particle accelerators,high-activity laboratories, fuel reprocessing plants, etc., and provide alarms when theradiation field goes outside predetermined limits.The assemblies considered in this document comprise at least:- a detector assembly, which may, for example, consist of a detector probe (for thermalneutrons such as BF3 proportional counter, 3He proportional counter, 6LiI(Tl) scintillationdetector, etc.) and a moderating and absorbing medium surrounding the detector;- a processing assembly, which may be fitted into a centralized panel, which, in the case ofwarning assemblies and monitors, provides signal outputs and contacts capable ofactivating alarm or other trip circuits;- alternatively, the case when all the processing electronics are placed within the detectionunit (so called "smart blocks") may be considered. In this case the functions of theprocessing assembly will be composed of only the indication, the providing signal outputsand contacts.This document specifies general characteristics, general test procedures, radiationcharacteristics, as well as electrical, mechanical, safety, and environmental characteristics, aswell as the identification certificate for the assemblies defined in the scope.Assemblies designed to perform combined functions comply with the requirements pertainingto each of these functions.This document is not applicable to criticality monitors covered by IEC 60860, or to assembliesintended to give information about operational parameters of nuclear plants for controlpurposes. This document is not applicable to the operating characteristics of indicating orrecording instruments as such (for instance, indicating meters, recorders, etc.). Thecharacteristics of such instruments are in conformity with the general requirementsappropriate to them.This document does not cover hand-held neutron dose (rate) meters and instruments that arecovered in IEC 61005.No tests are specified in this document for performance requirements in pulsed radiationfields. It is understood that an assembly designed to meet this document may not be suitablefor use in these fields.
|English title||Radiation protection instrumentation - Installed ambient dose equivalent rate meters, warning and monitoring assemblies for neutrons with energies from thermal to 20 MeV|