IEC 60951-4:20 09为事故和事故后条件下核电厂工艺流中放射性的连续在线或在线监测设备的设计原则和性能标准提供了一般指南。IEC 60951-1给出了技术特性、试验程序、辐射特性、电气、机械和环境特性的一般要求。除非另有说明，这些要求适用于本部分。与上一版相比，主要技术变化如下: -澄清定义； -更新自第一版以来发布的新标准的参考资料； -更新辐射单位。 本出版物应与IEC 60951-1:20 09一起阅读。

IEC 60951-4:2009 provides general guidance on the design principles and performance criteria for equipment for continuous in-line or on-line monitoring of radioactivity in process stream in nuclear power plants for accident and post-accident conditions. General requirements for technical characteristics, test procedures, radiation characteristics, electrical, mechanical, and environmental characteristics are given in IEC 60951-1. These requirements are applicable in this part unless otherwise stated. The main technical changes with regard to the previous edition are as follows:
- clarify the definitions;
- up-date the references to new standards published since the first edition;
- update the units of radiation.

This publication is to be read in conjunction with IEC 60951-1:2009.