Modelling of composite neutron scintillators

Area of Science:

• Materials Science
• Nuclear Instrumentation
• Computational Physics

Background:

• Composite neutron scintillators, utilizing fluorescent dopants (e.g., ZnS:Ag) in neutron-sensitive matrices (e.g., 6Li-containing glass), are widely used for neutron detection.
• Key performance factors include dopant particle size, volume doping fraction, and material densities, which influence scintillation probability and pulse-height spectra.

Purpose of the Study:

• To investigate the impact of dopant particle size, volume doping fraction, and matrix density on the performance of composite neutron detectors.
• To characterize the resulting pulse-height spectra and neutron capture probabilities.

Main Methods:

• Development and utilization of a Monte Carlo simulation model for composite neutron detectors.
• Systematic variation of dopant particle characteristics (size, doping fraction) and matrix properties (density) within the simulation.

Main Results:

• Quantification of how variations in dopant particle size and doping fraction affect light output and neutron detection probability.
• Demonstration of the influence of matrix material density on detector performance characteristics.
• Detailed analysis of pulse-height spectrum variations based on detector design parameters.

Conclusions:

• The study provides a quantitative understanding of how microstructural parameters influence composite neutron scintillator performance.
• Simulation results offer guidance for optimizing the design of ZnS:Ag-based neutron detectors for specific applications.
• This work establishes a framework for further computational studies on advanced neutron detection materials.