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.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
ON: DE82003867; TRN: 82-005104
- DOE Contract Number:
- Resource Type:
- 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
- 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
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