浮沉子法用来测定重水样品的密度,与一参考样品相比,从水的热膨胀系数可以计算氘含量,是一种熟知的方法。本方法的一个要点,是待测水样经脱气后,在测量过程中须避免空气的重新溶入,因此我们设计了一种内插毛细管磨塞型淳沉子管,见图1。操作 The float-sink method is used to determine the density of heavy water samples. It is a well-known method to calculate the deuterium content from the coefficient of thermal expansion of water compared to a reference sample. One of the main points of this method is that after the sample water to be tested is degassed, the air must be prevented from re-entering during the measurement process. Therefore, we designed a capillary tube type plugging capillary tube, shown in Figure 1. operating