分类: 核科学技术 >> 核探测技术与核电子学 提交时间: 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
摘要: A digital coincidence acquisition system applied to a portable liquid scintillation counting device is developed. The system which simplifies the device design consists of a digitizer card of Agilent U1066A DC438, a discriminator and a host computer. The anode analog pulses from two photomultiplier tubes are captured by the system, which adopts the sequence acquisition storage mode. By choosing proper threshold for each channel, coincidence time window of 30 ns, and comparing the pulse amplitudes from two channels, the portable scintillation counting device can be used to detect particles. For the unquenched standard 3H sample, the results show that the detection efficiency is (58.50.1)% and the background is (86.70.7) cpm. Meanwhile, 3H spectrum is obtained.