Optical properties and pulse shape discrimination in siloxane-based scintillation detectors

Area of Science:

• Nuclear Physics
• Materials Science
• Radiation Detection

Background:

• Detecting fast neutrons separately from gamma rays is crucial for homeland security and nuclear research.
• Current methods like Helium-3 detectors are expensive, and liquid scintillators pose safety and disposal risks.

Purpose of the Study:

• To develop and analyze a novel solid scintillator for effective fast neutron detection.
• To evaluate its performance in discriminating neutrons from gamma rays using pulse shape analysis (PSA).

Main Methods:

• Fabrication of a solid scintillator using polymethylphenylsiloxane (PMPS) and 2,5-diphenyloxazole (PPO).
• Detailed optical characterization, including fluorescence decay kinetics.
• Correlation of optical properties with pulse shape discrimination (PSD) capabilities.

Main Results:

• The PMPS-PPO solid scintillator demonstrates effective pulse shape discrimination (PSD) for fast neutrons against gamma rays.
• Optical analyses revealed insights into conformational features and excimer formation influencing performance.
• The material exhibits radiation and thermal resistance.

Conclusions:

• The developed solid scintillator presents a viable, cost-effective, and safer alternative for neutron detection.
• Understanding the optical properties is key to optimizing PSD performance in solid scintillators.
• This technology has significant potential for radiation monitoring and security applications.