標準號：BS EN 61005-2004
中文標準名稱：輻射防護測量儀.中子環境劑量當量(率)計
英文標準名稱：Radiation protection instrumentation. Neutron ambient dose equivalent (rate) meters
標準類型：F84
發布日期：2004/12/6 12:00:00
實施日期：2004/12/6 12:00:00
中國標準分類號：F84
國際標準分類號：17.240
適用范圍：This International Standard is applicable to all assemblies designed to measure the ambient dose equivalent (rate) due to neutron radiation of energy up to 16 MeV, and which comprise at least: a) a detection assembly, which may, for example, consist of a detector probe for thermalised neutrons and an arrangement of moderating and absorbing media surrounding the detector; b) a measuring assembly with a display for the measuring result, which may be incorporated into a single assembly or connected by means of a flexible cable. NOTE Z If the Equipment consists of separate detector and measurement assemblies the cable between the two shall be that specified by the manufacturer. If the connection is by other means (e.g. radio waves, infrared) or other cables, it is necessary to apply additional requirements with respect to the specific media. The requirements given below pertain to assemblies as defined in the first paragraph. It is acceptable, however, to use assemblies, which do not meet the requirements below when such requirements are not deemed essential for a given purpose. In such cases, the requirements to be applied to the assemblies should be specified by agreement between the manufacturer and the purchaser, but the methods of determination of the characteristics of the assemblies should conform to this standard. No tests are specified in this standard for the performance requirements of the assemblies in pulsed radiation fields, and it is to be considered that an assembly designed to meet this standard may not be suitable for use in such fields. The object of this standard is to specify requirements for the performance characteristics of neutron ambient dose equivalent (rate) meters, and to prescribe the methods of testing in order to determine compliance with this standard. This standard specifies, for the assemblies described in the first paragraph, general characteristics, general test procedures, radiation characteristics, electrical, mechanical, safety and environmental characteristics, and also the identification certificate. Requirements and test procedures are also specified for the alarm performance of the dose equivalent (rate) meters, which are equipped with alarm provisions. NOTE Dose equivalent (rate) meters for neutrons have an energy dependence of ambient dose equivalent response, which may deviate considerably from unity. The response in realistic spectra encountered in workplace fields is such that the deviations in different energy ranges tend to neutralise each other. Consequently, the response in realistic fields is generally much closer to unity. ISO 12789 specifies a list of appropriate neutron sources having broad spectra suitable for the testing of such (rate) meters. Also work places may be specified by agreement between manufacturer and purchaser to be appropriate for testing when the spectral environment is well defined. Unconventional dose equivalent ratemeters, for example consisting of more than one detector probe, have recently become available. For such instruments, evaluation based on mono-energetic neutrons is not relevant. Also for those ratemeters, the above considerations may apply.