【摘要】 本文介绍专为测量低水平样品而设计的带有反符合屏蔽的双管符合型液体闪烁计数器。装置对5ml¹⁴C标准源的测量效率为76.3％,对5ml糖炭溶液的测量效率为76.8％,本底为0.40±0.02计数/min,优值为14550。对20ml⁸H标准源的测量效率为52.6％,本底为1.11+0.02计数/min,优值为2492。测量氚水样时,采用TritonX-100乳化剂直接测水,18ml样品中含有6ml氚水,测量效率为21％,本底为0.68±0.02计数/min,1000min的灵敏度为2.7Tu。更多还原

【Abstract】 In this paper the structure and the characteristics of model FH1915 Low-background Liquid. Scintillation Counter are described.It is a liquid scintillation counter with anticoincidence shield, consisting of sample detector,anticoincidence detector, lead shield and measuring circuit and TP-801 computer.For 14C source, the detection efficiency is 76.3%, the background is 0.40±0.02 cpm; for 3H source , the detection efficiency and the background are 52.6% and 1.11 ±0.02 cpm respectively.更多还原