规定了体内计数系统的分类、一般设计要求、性能特征和试验程序，用于检测核电厂工作人员、处理放射性核素的实验室和设施以及居住在可能受污染区域的居民体内的痕量放射性核素。目的是确定器官的等效剂量和全身内照射的有效剂量。

Specifies the classification, general design requirements, performance characteristics and test procedures for in vivo counting systems for detecting trace amounts of radionuclides in the bodies of persons working in nuclear power plants, laboratories and facilities handling radionuclides, and inhabitants living on territory which may be contaminated. The purpose is to determine the dose equivalent to organs and the effective dose of internal radiation for the whole body.