Allison Lim


Materials Chemist

Polysiloxane Scintillators Capable of Pulse Shape Discrimination


Problem:
Traditional plastic scintillators capable of pulse shape discrimination (PSD) are based on thermoplastics. This limits their potential applications.

Hypothesis:
Polysiloxanes with high phenyl content may provide an elastomeric matrix for PSD capable plastic scintillators, meeting requirements for flexible applications.

Summary of Results:
  • A high phenyl content polysiloxane matrix was identified from Wacker.
  • A commercial and synthesized dopant were loaded up to 5 wt% .
  • Even at low dopant loadings, polysiloxane scintillators performed as well or better than traditional analogs. This is the first time polysiloxanes, or any other polymer, has been shown to have comparable PSD to polystyrene or poly(vinyl toluene).
(Left) FoM and LY of PPO-Polysiloxane samples compared to commercially available EJ-299-33. (Right) FoM and LY of PhF-Polysiloxane samples compared to commercially available EJ-299-33.

Publications


Polysiloxane Scintillators for Efficient Neutron andGamma-Ray Pulse Shape Discrimination


Allison Lim, Jonathan Arrue, Paul B. Rose, Alan Sellinger, Anna S. Erickson


ACS Applied Polymer Materials, vol. 2(8), 2020 Jun 12, pp. 3657-3662


Polysiloxane scintillators for neutron and gamma-ray pulse shape discrimination


Allison Lim, Jonathan Arrue, Paul B. Rose, Alan Sellinger, Anna Erickson


Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXII, 2020 Jul 19