Evaluation of a positron-emission-tomography-based SiPM readout for compact segmented neutron imagers

Li, Viacheslav A.; Sutanto, F.; Classen, T.; Dazeley, S.; Jovanovic, Igor; Wu, T.

doi:10.1016/j.nima.2022.167624

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The possibility exists that the preamplifier is somehow causing the observed degradation either because of the large increase in capacitance of the SiPMs used compared to the nominal value, or because it was not designed to preserve pulse shape in this manner. Aside from this, the QDC also has a somewhat narrow linear range, also demonstrated by [10], which limits the response for broad fission energy neutrons. For these reasons, we focus our efforts on using the TOT method for PSD measurements.…”

Section: The Tofpetasic and Readout Systemmentioning

confidence: 97%

“…As discussed above, there is also a 5 ns jitter in the integration stop time. We have studied the impact of these parameters, and found they do not effect pulse shape measurements to the degree demonstrated by [10]. The possibility exists that the preamplifier is somehow causing the observed degradation either because of the large increase in capacitance of the SiPMs used compared to the nominal value, or because it was not designed to preserve pulse shape in this manner.…”

Section: The Tofpetasic and Readout Systemmentioning

confidence: 98%

“…Prior results have demonstrated PSD measurements with the TOFPET2 readout system from PETsys Electronics by acquiring each SiPM pixel with two ASIC channels to enable two independent charge integration windows [10]. This method results in highly degraded performance, as shown experimentally in [10]. This may be partly due to the particulars of the QDC and its integration.…”

Section: Introductionmentioning

confidence: 99%

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Pulse shape measurements for neutron/gamma discrimination using the TOFPET2 ASIC

2023

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Many highly pixelated organic scintillator detection systems would benefit from independent readout of each scintillator pixel. Recent advances in Silicon Photomultiplier (SiPM) technology makes this goal feasible, however the data acquisition from potentially hundreds or thousands of channels requires a low-cost and compact solution. For pixelated neutron detection with organic scintillators, the capability to distinguish between neutron and gamma interactions using Pulse Shape Discrimination (PSD) is required along with pulse charge and time of arrival. The TOFPET2 ASIC from PETsys Electronics is a 64-channel readout chip providing pulse time and charge integration measurements from SiPMs, and is specifically designed for time-of-flight positron-emission tomography. Using an 8 × 8 array of 6 mm × 6 mm J-series SiPMs from SensL/OnSemi (ArrayJ-60035-64P-PCB), we have studied the energy and PSD performance of the TOFPET2 ASIC using a 4 × 4 array of 6 mm × 6 mm × 30 mm trans-Stilbene crystals from Inrad Optics and a custom SiPM routing board from PETsys Electronics. Using a time-over-threshold method, we measure a maximum PSD figure-of-merit of approximately 1.2 at 478 keV (the Compton edge of 662 keV) for a J-series SiPM operating at an over-voltage of 3V.

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Section: The Tofpetasic and Readout Systemmentioning

confidence: 97%

Section: The Tofpetasic and Readout Systemmentioning

confidence: 98%