Wavelength-Shifting-Fiber Scintillation Detectors for Thermal Neutron Imaging at SNS

Conference · Sun Jan 01 04:00:00 EST 2012

OSTI ID:1042859

Clonts, Lloyd G ^[1]; Cooper, Ronald G ^[1]; Crow, Lowell ^[1]; Diawara, Yacouba ^[1]; Ellis, E Darren ^[1]; Funk, Loren L ^[1]; Hannan, Bruce W ^[1]; Hodges, Jason P ^[1]; Richards, John D ^[1]; Riedel, Richard A ^[1]; Wang, Cai-Lin ^[1]

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1. ORNL

We have developed wavelength-Shifting-fiber Scintillator Detector (SSD) with 0.3 m2 area per module. Each module has 154 x 7 pixels and a 5 mm x 50 mm pixel size. Our goal is to design a large area neutron detector offering higher detection efficiency and higher count-rate capability for Time-Of-Flight (TOF) neutron diffraction in Spallation Neutron Source (SNS). A ZnS/6LiF scintillator combined with a novel fiber encoding scheme was used to record the neutron events. A channel read-out-card (CROC) based digital-signal processing electronics and position-determination algorithm was applied for neutron imaging. Neutron-gamma discrimination was carried out using pulse-shape discrimination (PSD). A sandwich flat-scintillator detector can have detection efficiency close to He-3 tubes (about 10 atm). A single layer flat-scintillator detector has count rate capability of 6,500 cps/cm2, which is acceptable for powder diffractometers at SNS.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor; Spallation Neutron Source
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1042859
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
DESIGN
DETECTION
DIFFRACTOMETERS
EFFICIENCY
FIBERS
NEUTRON DETECTORS
NEUTRON DIFFRACTION
NEUTRON SOURCES
NEUTRONS
PHOSPHORS
PROCESSING
SCINTILLATION COUNTERS
SPALLATION
THERMAL NEUTRONS