Design, Simulation, and Characterization of a Deuterated Plastic Scintillator for a Portable Neutron Spectrometer

Author

• Anders M. Kinney II

Date of Award

3-2025

Document Type

Thesis

Degree Name

Master of Science in Nuclear Engineering

Department

Department of Engineering Physics

First Advisor

Michael T. Febbraro, PhD

Abstract

This thesis examines the design, simulation, and experimental characterization of a novel deuterated plastic scintillator for portable neutron spectroscopy applications related to homeland security and nuclear non-proliferation. Using Monte Carlo N-Particle (MCNP) simulations and experimental tests with gamma-ray (¹³⁷Cs) and neutron sources (AmBe, ²⁵²Cf), this research shows that deuterium substitution in scintillators significantly enhances pulse shape discrimination (PSD) and neutron energy spectrum unfolding capabilities. Although deuterated scintillators demonstrate reduced overall light output, their higher stopping power and increased ionization quenching lead to superior neutron event differentiation, particularly between (α, n) and spontaneous fission neutrons critical for detecting special nuclear materials. The EJ-301D scintillator exhibited the best performance, while a 1” deuterated sample achieved comparable PSD quality. Despite cost and fabrication challenges, this work validates the viability and advantages of deuterated scintillators to improve portable neutron detection technologies.

AFIT Designator

AFIT-ENP-MS-25-M-230

DTIC Accession Number

AD1356649

Comments

An embargo was observed for posting this graduate work on AFIT Scholar. Approved for public release, distribution unlimited. PA case number 88ABW-2025-0360.

Recommended Citation

Kinney, Anders M. II, "Design, Simulation, and Characterization of a Deuterated Plastic Scintillator for a Portable Neutron Spectrometer" (2025). Theses and Dissertations. 8298.
https://scholar.afit.edu/etd/8298