Gamma discrimination in pillar structured thermal neutron detectors

Conference · Mon Mar 26 00:00:00 EDT 2012

DOI:https://doi.org/10.1117/12.918513· OSTI ID:1046803

Shao, Q; Radev, R P; Conway, A M; Voss, L F; Wang, T F; Nikolic, R J; Deo, N; Cheung, C L

Solid-state thermal neutron detectors are desired to replace {sup 3}He tube based technology for the detection of special nuclear materials. {sup 3}He tubes have some issues with stability, sensitivity to microphonics and very recently, a shortage of {sup 3}He. There are numerous solid-state approaches being investigated that utilize various architectures and material combinations. By using the combination of high-aspect-ratio silicon PIN pillars, which are 2 {micro}m wide with a 2 {micro}m separation, arranged in a square matrix, and surrounded by {sup 10}B, the neutron converter material, a high efficiency thermal neutron detector is possible. Besides intrinsic neutron detection efficiency, neutron to gamma discrimination is an important figure of merit for unambiguous signal identification. In this work, theoretical calculations and experimental measurements are conducted to determine the effect of structure design of pillar structured thermal neutron detectors including: intrinsic layer thickness, pillar height, substrate doping and incident gamma energy on neutron to gamma discrimination.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 1046803
• Report Number(s): LLNL-PROC-543492; TRN: US1203799
• Resource Relation: Journal Volume: 8358; Conference: Presented at: SPIE defense security and sensing 2012, Baltimore, MD, United States, Apr 23 - Apr 27, 2012
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BORON
DESIGN
DETECTION
EFFICIENCY
NEUTRON CONVERTERS
NEUTRON DETECTION
NEUTRON DETECTORS
NEUTRONS
PERFORMANCE
SECURITY
SENSITIVITY
SHORTAGES
SILICON
SIMULATION
STABILITY
SUBSTRATES
THERMAL NEUTRONS
THICKNESS