Study of unfolded gamma spectra by using EJ309 liquid scintillator detector

Zhang, Shuangjiao; Liu, Changqi; Xu, Y.; Huang, Chao; Xie, Qin; Hu, Zhijie; Han, Chaoyu; Bai, Xiaohou; Huo, Dong-Ying; Wu, Kang; Wang, Junrun; Zheng, Wei; Yao, Zeen

doi:10.1016/j.nima.2021.165407

Cited by 6 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among them, gas detectors have the advantages of simple structure, large output pulse amplitude, and stable performance [1,10], but their relatively low gas density, poor detection sensitivity, low spatial resolution, large size, and the need for hundreds of volts of bias voltage limit their applications. Scintillation detectors have the advantages of high detection efficiency, greater radiation hardness, and wide applicability [2,9,13], but it needs to be coupled with a photoelectric converter to obtain electrical signals, so it is an indirect measurement method, which makes the system complicated. In addition, the light yield and luminescence decay time of the scintillator, the gain of photoelectric converter are easily affected by temperature, making the resolution significantly worse when temperature varies [9,14,16].…”

Section: Introductionmentioning

confidence: 99%

Development of a novel high-performance readout circuit for α and β energy spectrum measurement

Deng

et al. 2022

J. Inst.

View full text Add to dashboard Cite

A novel high-performance readout circuit with multi-Junction field-effect transistors (Multi-JFETs) and high-speed integrated operational amplifiers as the core was designed. By coupling the circuit to a large area passivated ion injection planar silicon (PIPS) detector, excellent α and β energy spectrum can be obtained. Therefore, it can be applied to radon monitor, radioactive aerosol monitor and other equipment to achieve high precision information on radioactive substances in the environment. The input stage of the circuit adopts the parallel structure of JFETs to achieve the matching between the amplifier circuit with the detector junction capacitance. The bias circuit adopts JFETs to form a constant current source while using the gate-source self-biased parallel structure to obtain large transconductance gain and good amplification linearity. The main amplifier circuit adopts a high-speed and low-noise operational amplifier with the advantages of high open-loop gain and stable quiescent point. The performance of this readout circuit was tested, in which the rise time of the signal is 35 ns, the sensitivity of charge-voltage conversion is better than 0.979 mV/fC when the input capacitance is less than 100 pF, and the equivalent noise charge is 1.55 fC, noise slope is 0.00366 fC/pF. By coupling the readout circuit to a PIPS detector with a sensitive area of 450 mm2, the signal-to-noise ratio of the output signal is 116:1 for the 241Am alpha source and 20:1 for the 90Sr-90Y beta particles. The energy spectrum measurement of the 238Pu source was performed, providing FWHM is 16.90 keV@5499 keV.

show abstract