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Spectral- and Pulse-Shape Discrimination in Triplet-Harvesting Plastic Scintillators

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7 Author(s)
Feng, P.L. ; Sandia Nat. Labs., Livermore, CA, USA ; Villone, J. ; Hattar, K. ; Mrowka, S.
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In this work, we describe a method to control the relative proportion of prompt and delayed luminosity of organic-based scintillators via direct and exponential emission from an extrinsic triplet state. This approach involves the incorporation of triplet-harvesting heavy metal complexes in plastic scintillator matrices to convert intrinsically non-luminescent host states to highly emissive guest states. Measurements on these plastic scintillators indicate improved light yields over the undoped polymers and the ability to perform neutron/gamma particle-discrimination. A similar extent of molecular-level control is not possible in traditional organic materials due to complex decay kinetics and the absence of spectral information for the delayed triplet-derived emission. The materials described here address these limitations through efficient host-guest triplet harvesting, which enables particle discrimination according to conventional pulse-shape discrimination (PSD) and a previously unreported spectral-shape discrimination (SSD) scheme.

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Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 6 )