一、引言在核素活度标准化工作中,定量取样是一项重要的因素。本文讨论在制作计数用薄膜放射源时,微量液滴准确定量的方法、程序、误差及注意事项等问题。二、操作程序及方法放射性标准溶液通常配制成已注明单位质量溶液活度的酸性水溶液。在测定活度之前,常将母液用常规方法稀释成适于用作计数测量的放射性浓度。如果操作方法正确,稀释时, I. INTRODUCTION Quantitative sampling is an important factor in the standardization of radionuclide activity. This article discusses the methods, procedures, errors and precautions of accurate determination of the amount of micro-droplets during the production of thin film radioactive sources for counting purposes. Second, the operating procedures and methods Radioactive standard solution is usually formulated into a unit mass solution activity of acid aqueous solution. Before assaying activity, the mother liquor is often diluted by conventional means to a radioactive concentration suitable for use as a counting measure. If the method of operation is correct, when diluted,