Speaker
Description
Event-cameras are revolutionizing neutron resonance imaging (NRI), a technique extending the high-precision neutron resonance transmission analysis (NRTA) method to irregular and inhomogeneous samples through imaging. These cameras enable high rates up to 80 MS/s and, through event-by-event data acquisition, facilitate neutron/gamma discrimination and sub-pixel resolution via center-of-gravity algorithms. The temporal resolution, crucial for distinguishing resonance features in NRI, especially at higher energies, is determined by the moderator neutron source time profile, but the detection system response has a large impact as well.
Our setup utilizes the LumaCam, an event-mode camera coupled to a scintillator screen via an image intensifier. However, the scintillator's long decay time (1-100 μs) can span multiple resonances, complicating spectral analysis. Therefore, scintillator choice is increasingly important.
We conducted measurements at the FP-5 beamline at LANSCE, comparing three different scintillator screens for NRI of calibration foils and irregular, complex samples. The results, analyzed using the highly validated SAMMY software, highlight each scintillator's performance and advantages for NRI.
While high scintillator efficiency enables faster measurements and tomographic reconstructions, the current setup requires limiting light collection for large fields-of-view to avoid image intensifier and camera saturation. As larger fields-of-view and thicker, more efficient scintillators become available, these limitations must be addressed to enable quantitative isotopic mapping of large samples through NRI.
| Abstract Topic | Development of experimental techniques and new principles |
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