Fig. 7: Pulse-height spectra for irradiating the ⁶Li glass composite scintillator detector at different positions along the composite.

Pulse-height spectra recorded by photomultiplier (PMT) A (red curves) and PMT B (green curves) for a ²⁵²Cf source placed at five different positions along the long axis of the composite cylinder, with \(z=0\) indicating the geometric center of the composite cylinder. The pulse-height spectra recorded for uniform neutron exposure of the detector are also shown for reference. Note that, because the PMT outputs were not summed but rather read out individually, the pulse-height spectra shown here have lower resolution compared to the pulse-height spectra shown in Figs. 1 and 3a, where the output of the two PMTs were summed.