Liu Yuzhe, Chen Lian, Li Feng, Liang Futian, Jin Ge
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China.
Rev Sci Instrum. 2017 Jul;88(7):076101. doi: 10.1063/1.4991717.
The prompt gamma neutron activation analysis (PGNAA) technique is a real-time online method to analyze the composition of industrial materials. This paper presents a data acquisition system with a high count rate and real-time digital processing method for PGNAA. Limited by the decay time of the detector, the ORTEC multi-channel analyzer (MCA) can normally achieve an average count rate of 100 kcps. However, this system uses an electrical technique to increase the average count rate and reduce dead time, and guarantees good accuracy. Since the measuring time is usually limited to about 120 s, in order to accelerate the accumulation rate of spectrum and reduce the statistical error, the average count rate is expected to reach more than 500 kcps.
瞬发伽马中子活化分析（PGNAA）技术是一种用于分析工业材料成分的实时在线方法。本文介绍了一种用于PGNAA的具有高计数率和实时数字处理方法的数据采集系统。受探测器衰变时间的限制，ORTEC多道分析仪（MCA）通常平均计数率只能达到100千计数每秒。然而，该系统采用了一种电子技术来提高平均计数率并减少死时间，并保证了良好的准确性。由于测量时间通常限制在约120秒，为了加快能谱的积累速率并减少统计误差，期望平均计数率能达到500千计数每秒以上。
