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The development of efficient, robust plastic scintillators with pulse shape discrimination (PSD) has been of much interest in recent years. As is the case with many new technologies, initial formulations for PSD plastics provided new capabilities that have required in-depth research to refine. Herein we describe continued results from extensive optimization studies that have led to the development of PSD plastics with improved scintillation performance and physical properties. Improvements in the formulation for PSD plastics provide a groundwork from which element-loaded PSD plastics can be further advanced. Two separate approaches for incorporating lithium compounds into plastic scintillators are explored based on the identity of the lithium salt used. Aliphatic and aromatic lithium compounds require different methods of incorporation, resulting in different mechanisms of light quenching and reduction in PSD. These quenching mechanisms are explored and discussed for each type of lithium salt. Since at large size physical and scintillation characteristics are much more sensitive to preparation conditions, performance characterization of scaled plastics is described and compared among different formulations.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
Andrew N. Mabe,Leslie Carman,Andy Glenn,Steven Dazeley,Steve Payne, andNatalia Zaitseva
"Developments in lithium-loaded plastic scintillators with pulse shape discrimination (Conference Presentation)", Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 1111408 (17 September 2019); https://doi.org/10.1117/12.2531532
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Andrew N. Mabe, Leslie Carman, Andy Glenn, Steven Dazeley, Steve Payne, Natalia Zaitseva, "Developments in lithium-loaded plastic scintillators with pulse shape discrimination (Conference Presentation)," Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 1111408 (17 September 2019); https://doi.org/10.1117/12.2531532