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ASTM E803 1991 Edition, May 15, 1991
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Standard Test Method for Determining the L/D Ratio of Neutron Radiography Beams
Includes all amendments and changes through Reapproval Notice , 2013
Page Count:7
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This test method defines an empirical technique for the measurement of the effective collimation ratio,L/D, of neutron radiography beams. The technique is based upon analysis of a neutron radiographic image and is independent of measurements and calculations based on physical dimensions of the collimator system. The values derived by this technique should be more accurate than those based on physical measurements, particularly for poorly defined apertures.