1.1 本指南涵盖校准辐射探测器的能量响应，以及设置行人专用核材料（SNM）自动监测器中使用的鉴别器和警报阈值。 1.2 指南中介绍了自动行人SNM监视器及其应用 C1112 建议在安装时对监测器进行校准和测试，然后每隔三个月检查校准情况，并使用SNM对监测器进行测试。 1.3 SNM监测器的可靠运行部分取决于有效的测试、校准和维护程序。本指南中描述的程序和方法可能有助于实现可靠的操作，并及时获得误操作警告。 1.4 本指南可与其他ASTM标准结合使用。 图1 说明了校准与标准指南中描述的其他程序之间的关系，并说明了指南与SNM监视器用户的关系。图中用户下方的指南涉及操作监控器的常规程序。请注意，指南 C993 是一种厂内性能评估，用于在校准监测器后验证SNM的可接受检测。中用户上方显示的指南 图1 提供有关应用SNM监视器的信息( C1112 )关于SNM监视器的评估( C1169 )提供有关监控器性能的比较信息。 图1 校准与SNM监测器标准指南中描述的其他程序的关系 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 SNM监视器是搜索行人以寻找隐藏SNM的有效手段。保持监控器的有效性取决于作为持续维护计划一部分的适当校准和调整。 5.2 本指南对于必须检测SNM的监控器用户的意义在于描述为此目的的校准和调整程序。 5.3 本指南对监护仪制造商的意义在于描述校准程序，特别是用于检测可能不易获得的SNM形式。

1.1 This guide covers calibrating the energy response of the radiation detectors and setting the discriminator and alarm thresholds used in automatic pedestrian special nuclear material (SNM) monitors. 1.2 Automatic pedestrian SNM Monitors and their application are described in Guide C1112 , which suggests that the monitors be calibrated and tested when installed and that, thereafter, the calibration should be checked and the monitor tested with SNM at three-month intervals. 1.3 Dependable operation of SNM monitors rests, in part, on an effective program to test, calibrate, and maintain them. The procedures and methods described in this guide may help both to achieve dependable operation and obtain timely warning of misoperation. 1.4 This guide can be used in conjunction with other ASTM standards. Fig. 1 illustrates the relationship between calibration and other procedures described in standard guides, and it also shows how the guides relate to an SNM monitor user. The guides below the user in the figure deal with routine procedures for operational monitors. Note that Guide C993 is an in-plant performance evaluation that is used to verify acceptable detection of SNM after a monitor is calibrated. The guides shown above the user in Fig. 1 give information on applying SNM monitors ( C1112 ) and on evaluating SNM monitors ( C1169 ) to provide comparative information on monitor performance. FIG. 1 The Relationship of Calibration to Other Procedures Described in Standard Guides for SNM Monitors 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 SNM monitors are an effective means to search pedestrians for concealed SNM. Maintaining monitor effectiveness rests on appropriate calibration and adjustment being part of a continuing maintenance program. 5.2 The significance of this guide for monitor users who must detect SNM is to describe calibration and adjustment procedures for the purpose. 5.3 The significance of this guide for monitor manufacturers is to describe calibration procedures, particularly for detecting forms of SNM that may not be readily available to them.