本标准规定了放射性核素伽马射线发射率测量用碘化钠探测器系统的性能测试、校准和使用方法；放射性测定；以及伽马射线能量的测定。它包括能量校准和效率校准。我们考虑了以下三种技术:（1）总频谱计数（见5.1）采用了一种系统，该系统对能量阈值以上的所有事件进行计数（见7.1、7.2和7.3）。（2） 单通道分析仪计数（见5.2）采用了一个带有计数窗口的系统，该窗口建立了上下能量边界（见7）。 1、7.2和7.3）。（3） 多通道分析仪计数（见5.3）采用多个计数窗口的系统。该技术适用于不涉及重叠峰的测量，以及在不引入不可接受误差的情况下减去全能量峰下连续统的测量[4]。

This standard establishes methods for performance testing, calibration, and usage of sodium iodide detector systems for the measurement of gamma-ray emission rates of radionuclides; the assay for radioactivity; and the determination of gamma-ray energies. It covers both energy calibration and efficiency calibration. The following three techniques are considered: (1) Total spectrum counting (see 5.1) employs a system that counts all events above a low-energy threshold (see 7.1, 7.2, and 7.3). (2) Single-channel analyzer counting (see 5.2) employs a system with a counting window which establishes upper and lower energy boundaries (see 7.1, 7.2, and 7.3). (3) Multichannel analyzer counting (see 5.3) employs a system in which multiple counting windows are utilized. This technique applies to measurements that do not involve overlapping peaks and those for which the continuum under the full-energy peak can be subtracted without introducing unacceptable error [4].