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Title: A system for fast neutron radiography

A system has been designed and a neutron generator installed to perform fast neutron radiography. With this system, objects as small as a coin and as large as a 19 liter container have been radiographed. The neutron source is an MF Physics A-711 neutron generator which produces 3 x 10[sup 10] neutrons/second with an average energy of 14. 5 MeV. The radiography system uses x-ray scintillation screens and film in commercially available light-tight cassettes. The cassettes have been modified to include a thin sheet of plastic to produce protons from the neutron beam through elastic scattering from hydrogen and other low Z materials in the plastic. For film densities from 1.8 to 3.0, exposures range from 1.9 x 10[sup 7] n/cm[sup 2] to 3.8 x 10[sup 8] n/cm[sup 2] depending on the type of screen and film. The optimum source-to-film distance was found to be 150 cm. At this distance, the geometric unsharpness was determined to be approximately 2.2-2.3 mm and the smallest hole that could be resolved in a 1.25 cm thick sample had a diameter of 0.079 cm.
Authors:
Publication Date:
OSTI Identifier:
467101
Report Number(s):
ANL/ED/CP--90460; CONF-961110--30
ON: DE97003885; TRN: 97:010061
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 14. international conference on the application of accelerators in research and industry, Denton, TX (United States), 6-9 Nov 1996; Other Information: PBD: 1997
Research Org:
Argonne National Lab., Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; FAST NEUTRONS; TECHNOLOGY UTILIZATION; INDUSTRIAL RADIOGRAPHY; NEUTRON GENERATORS; DESIGN; SHIELDING; IMAGES; RECORDING SYSTEMS; NEUTRON DETECTORS