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ASTM E803-91(2002)

Historical Reaffirmation

Standard Test Method for Determining the <emph type="ital">L/D&#x2009;</emph>Ratio of Neutron Radiography Beams

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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.


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.

SDO ASTM: ASTM International
Document Number E803
Publication Date May 15, 1991
Language en - English
Page Count 7
Revision Level 91(2002)
Supercedes
Committee E07.05
Publish Date Document Id Type View
July 1, 2020 E0803-20 Revision
Nov. 1, 2017 E0803-17 Revision
Jan. 1, 1991 E0803-91 Revision
June 1, 2013 E0803-91R13 Reaffirmation
July 1, 2008 E0803-91R08 Reaffirmation
Jan. 1, 1996 E0803-91R96 Reaffirmation
May 15, 1991 E0803-91R02 Reaffirmation