Neutron spectroscopy of plutonium using a handheld detection system

Area of Science:

• Nuclear Physics
• Materials Science
• Analytical Chemistry

Background:

• Distinguishing between plutonium oxide and metal forms is critical for nuclear nonproliferation and international safeguards.
• Plutonium metal is associated with nuclear weapons, while oxide forms are relevant to nuclear reactor fuel.
• Neutron energy spectra differ significantly between plutonium metal and oxide forms.

Purpose of the Study:

• To develop and validate a method for discriminating between plutonium oxide and metal forms using organic scintillation detectors.
• To assess the feasibility of rapid, in-field identification of different plutonium materials.

Main Methods:

• Measurements of plutonium metal and oxide samples using a handheld organic glass scintillator detection system.
• Monte Carlo modeling to simulate neutron interactions and understand spectral features.
• Analysis of neutron energy spectra across multiple regions to identify unique signatures.

Main Results:

• The organic scintillation detector successfully differentiated between plutonium metal and oxide forms.
• Rapid (minutes) and unambiguous discrimination was achieved based on spectral analysis.
• Plutonium forms were also distinguished from a plutonium-beryllium neutron source.

Conclusions:

• Organic scintillation detection offers a viable method for rapid, on-site discrimination of plutonium forms.
• This technology has significant applications in nuclear treaty verification and safeguarding nuclear materials.
• The ability to distinguish weapons-usable material from reactor fuel enhances global security.