Measuring the scintillation decay time for different energy deposited by gamma- rays and neutrons in a Cs2LiYCl6:Ce3+ detector

作者：Wen Xianfei^*; Enqvist Andreas

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2017, 853: 9-15.

DOI：10.1016/j.nima.2017.02.019

• CLYC
• Decay time
• Energy deposition
• Pulse fitting
• Pulse shape discrimination

In nuclear safeguards and homeland security applications, it is greatly beneficial to simultaneously detect gamma-rays, thermal neutrons, and fast neutrons using a single detector with reasonable pulse shape discrimination capability, energy resolution comparable with or even better than NaI(Tl) detectors, and high detection efficiency. Cs2LiYCl6:Ce3+(CLYC) scintillation detectors have been proven to be one promising candidate to meet these requirements. In this work, the decay time and fraction of each scintillation component for different energy deposition and incident particle type (gamma-ray, thermal neutron, and fast neutron) were investigated based on fitting the PMT anode output with exponential functions. For gamma-rays, four Components were determined with ultrafast decay time of less than one nanosecond and slow time in the order of magnitude of microsecond. It was found that the dependence on the energy deposited by gamma-rays of the fraction as well as the decay time of the three slow components was small. However, significant dependence was observed for the ultrafast component. Two or three components were determined for thermal neutrons and fast neutrons without observing a component with fast decay time. To verify the approach used it was first applied to scintillation pulses induced by gamma-rays in a NaI(Tl) detector. The results were consistent with well-known data already published in the literature.

• 出版日期2017-5-1