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Title: Large-area proportional counter camera for the US National Small-Angle Neutron Scattering Facility

An engineering model of a multiwire position-sensitive proportional-counter (PSPC) was developed, tested, and installed at the US National Small-Angle Neutron Scattering Facility at ORNL. The PSPC is based on the RC-encoding and time-difference decoding method to measure the spatial coordinates of the interaction loci of individual scattered neutrons. The active area of the PSPC is 65 cm x 65 cm, and the active depth is 3.6 cm. The spatial uncertainty in both coordinates is approx. 1.0 cm (fwhm) for thermal neutrons; thus, a matrix of 64 x 64 picture elements is resolved. The count rate capability for randomly detected neutrons is 10/sup 4/ counts per second, with < 3% coincidence loss. The PSPC gas composition is 63% /sup 3/He, 32% Xe, and 5% CO/sub 2/ at an absolute pressure of approx. 3 x 10/sup 5/ Pa (3 atm). The detection efficiency is approx. 90% for the 0.475-nm (4.75-A) neutrons used in the scattering experiments.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
5804859
Report Number(s):
CONF-801103-66
ON: DE82003867; TRN: 82-005104
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Conference
Resource Relation:
Conference: IEEE nuclear science symposium, Orlando, FL, USA, 5 Nov 1980
Research Org:
Oak Ridge National Lab., TN (USA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; MULTIWIRE PROPORTIONAL CHAMBERS; PERFORMANCE TESTING; SPECIFICATIONS; TEST FACILITIES; MEASURING INSTRUMENTS; PROPORTIONAL COUNTERS; RADIATION DETECTORS; TESTING 440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments