这个定义的实物基准是“Kr同位素光谱灯(图4)。图中的2就是~(86)Kr同位素光谱灯,将它放在将有液氮的杜瓦瓶5中,并用由电机带动的叶片搅拌液氮,使光谱灯得到充分的冷却,整个装置用外壳6密封,以保证具有一定的真空度,并用热电偶7测量光谱灯的管壁温度,以监视是否达到规定的温度条件。 The physical reference for this definition is "Kr Isotopic Spectrum Light (Figure 4). In Figure 2, the ~ (86) Kr Isotopic Spectrum Light is placed in a Dewar 5 with liquid nitrogen and driven by a motor The blades were agitated with liquid nitrogen to allow the spectral lamp to be adequately cooled. The entire assembly was sealed with a housing 6 to ensure a certain degree of vacuum and the thermometer 7 was used to measure the wall temperature of the spectral lamp to monitor whether the specified temperature conditions were met.