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Description of ASTM-E803 2013ASTM E803 - 91(2013)Standard Test Method for Determining the L/D? Ratio of Neutron Radiography BeamsActive Standard ASTM E803 | Developed by Subcommittee: E07.05 Book of Standards Volume: 03.03 ASTM E803Significance and Use 4.1 The quality of a neutron radiographic image is dependent upon many factors. The L/D ratio is one of those factors and constitutes a numerical definition of the geometry of the neutron beam. The L/D ratio required for a specific neutron radiographic examination is dependent upon the thickness of the specimen and the physical characteristics of the particular element of interest. Use of this test method allows the radiographer and the user to determine and periodically check the effective collimation ratio. 1. Scope 1.1 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.
ASTM Standards E748 Practices for Thermal Neutron Radiography of Materials E1316 Terminology for Nondestructive Examinations Keywords beam collimation; L/D ratio; neutron radiography; radiographic unsharpness; umbral shadow; ICS Code ICS Number Code 19.100 (Non-destructive testing) DOI: 10.1520/E0803 ASTM International is a member of CrossRef. ASTM E803This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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