ASTM-E803 › Standard Test Method for Determining the L/D Ratio of Neutron Radiography Beams
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Scope
1.1 This 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.
Keywords
beam collimation; L/D ratio; neutron radiography; radiographic unsharpness; umbral shadow
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Document Number
ASTM-E0803-20
Revision Level
2020 EDITION
Status
Current
Modification Type
Reapproval
Publication Date
Aug. 13, 2020
Document Type
Test Method
Page Count
7 pages
Committee Number
E07.05