This standard is applicable to instruments that measure the ambient dose equivalent (rate) generated by neutron radiation with energy below 16 MeV, which at least includes: a) Detection device, such as a moderating and absorbing medium that is heated in the detector and around the detector b) A measuring device with display of measurement results, which may be integrated with the detection device, or may be a separate device connected by cables. The requirements for the above mentioned devices are given below. For devices with special purposes, and some of the following requirements are not necessary, the manufacturer and the user are allowed to negotiate and specify the special requirements applicable to these devices, but the method for determining the performance of the device should comply with this standard. This standard does not specify performance test methods for devices in pulsed radiation fields, so it cannot be determined whether a device that meets this standard is suitable for use in pulsed radiation fields. This standard specifies the performance requirements for factory neutron ambient dose equivalent (rate) instruments and the test methods to determine that their performance meets the requirements of this standard. This standard also specifies the general characteristics and general tests of neutron ambient dose equivalent (rate) instruments. method, radiation characteristics, electrical characteristics, mechanical characteristics, safety characteristics and environmental characteristics, and provides the requirements for inspection certificates, and also stipulates the factory's requirements and test methods for neutron ambient dose equivalent (rate) instruments with alarm functions . Note: The ambient dose equivalent response of the neutron ambient dose equivalent (rate) instrument is related to energy and may deviate greatly from the consistency requirements. However, relative to the actual energy spectrum in the workplace, deviations in different energy ranges may tend to cancel each other out, so the response to actual neutron fields tends to be close to unity. ISO 12789 specifies a range of broad-spectrum neutron sources suitable for such instrument testing. It also specifies tests on workplaces with known energy spectra that can be determined by agreement between the manufacturer and the user. For unconventional dose equivalent rate instruments composed of more than one detector, it is not appropriate to evaluate such instruments based on monoenergetic neutrons. Such instruments can also be considered according to the above method.