本标准旨在规定用于评估便携式辐射检测仪器的性能标准和型式试验方法。这些仪器用于检测光子发射放射性物质和光子暴露率。仪器用于探测、拦截和预防。仪器可能包括指示暴露率增加的警报。 本标准不适用于主要用于测量剂量当量率的仪器。 与其他国土安全部不同- 讨论了与ANSI N42仪器标准相关的辐射/核初始响应（R/N初始响应）的一些问题。本修订标准附录H中提供了R/N初始响应的战术描述，通常与ANSI N42中的相关R/N初始响应仪器情况相关联。32，ANSI N42。34，ANSI N42。35，ANSI N42。38，ANSI N42。43，ANSI N42。53，并直接链接到ANSI N42。49A。这种直接联系是从低曝光率范围的便携式仪器到高曝光率范围的便携式仪器。 在某些R/N初始响应情况下，可能需要改变仪表量程。

The purpose of this standard is to specify performance criteria and type-test methods used to evaluate portable radiation detection instruments. These instruments are used for detection of photon emitting radioactive materials and photon exposure rates. Instruments are used for the purposes of detection, interdiction and prevention. Instruments may include alarms to indicate an increase in exposure rate. This standard does not apply to instruments that are primarily intended to provide a measurement of dose equivalent rate. In a departure from other DHS-related ANSI N42 instruments standards, some issues of Radiological/Nuclear initial response (R/N initial response) are discussed. A tactical description of R/N initial response is provided in this revised standard in Annex H and is generally linked to related R/N initial response instrumentation situations in ANSI N42.32, ANSI N42.34, ANSI N42.35, ANSI N42.38, ANSI N42.43, ANSI N42.53, and directly linked to ANSI N42.49A. This direct link is from a portable instrument with low exposure rate range to a portable instrument of a much higher exposure rate range. This instrument range change may be necessary in some R/N initial response situations.