【摘要】 <正> ¹⁴⁴Ce是一种重要的裂变产物（半衰期284.4天）,可作燃耗测定的监测体及γ谱仪的刻度源。目前4πβ-γ符合方法可完全消除对衰变纲图的修正,适用于标定那些衰变纲图复杂、又尚未精确知道的核素。在外推过程中,内转换电子的影响以及β计数器对γ射线的灵敏度均自动得到修正。更多还原

【Abstract】 This paper describes the measuring of the absolute activity of 114Ce by the 4πβ-γ coincidence absorption method. The corrections of background, dead time and resolving time have been done respectively with the measured results. The total uncertainty of the measurement is about ±0.6%.更多还原