2020/12/15 by Richard S. Woolf, Woolf, Richard S., Bernard F. Phlips +7
Medicine · Physics and Astronomy · #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Medical Imaging Techniques and Applications #Nuclear Physics and Applications #Radiation Detection and Scintillator Technologies
paper · pdf · doi:10.48550/arxiv.2012.08446
openalex publication_date 2020/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on the results of the positional-dependent pulse shape\ndiscrimination (PSD) parameter observed within a monolithic CLLB scintillation\ncrystal. CLLB, a relatively novel inorganic scintillation crystal, is capable\nof PSD between gamma rays, neutrons, and alpha particles. In this work, we\nobserved distinguishable differences in the pulse shapes for gamma-ray-induced\nevents. The CLLB crystals used for this experiment are 5 cm (diameter) by 10 cm\n(length). By using monoenergetic 2.614 MeV photons from a set of thoriated\nwelding rods and performing collimated scans along the length of the crystal,\nwe found that the centroid of the PSD distribution shifted as a function of\nposition. With positional-dependent PSD, one can obtain more accurate knowledge\nof the interaction location within a monolithic scintillation crystal. These\nresults could lead to improved angular resolution in imaging systems employing\nscintillation crystals that exhibit this behavior. Lastly, an understanding of\nthe dependence of the PSD as a function of position could give manufacturers a\nbetter understanding of the crystal properties and provide insight to the\ndistribution of internal contaminants and dopants within the crystal.\n