Boron-Based Neutron Scintillator Screens for Neutron Imaging

Area of Science:

• Materials Science
• Nuclear Instrumentation
• Imaging Technology

Background:

• Neutron scintillator screens are critical components in digital neutron imaging, directly impacting spatial resolution and neutron capture efficiency.
• Current systems often rely on lithium-6 fluoride (⁶LiF) and gadolinium oxysulfide, which have limitations in efficiency and resolution.

Purpose of the Study:

• To investigate boron-based neutron scintillators as an alternative to existing technologies.
• To explore the potential of boron-10 (¹⁰B) due to its high neutron absorption cross-section and favorable decay characteristics.

Main Methods:

• A parametric study was conducted, varying boron neutron converters, particle sizes, mix ratios, substrates, and sensor construction.
• Performance was evaluated by comparing neutron detection efficiency and spatial resolution against a standard ⁶LiF/ZnS scintillator.
• Neutron tomography was performed using optimized boron-based screens.

Main Results:

• Boron-based screens showed a 125% increase in thermal and 67% increase in epithermal neutron detection efficiency compared to ⁶LiF/ZnS.
• High-resolution boronated scintillators achieved measurable spatial resolution, enabling successful neutron tomography.
• Optimized boron scintillators demonstrated potential for improved neutron statistics.

Conclusions:

• Boron-based neutron scintillators represent a promising advancement for digital neutron imaging systems.
• They offer significant improvements in neutron detection efficiency and spatial resolution.
• These enhancements can lead to reduced acquisition times and better overall image quality for specific applications.