ASTM-E1114 › Historical Revision Information
Standard Test Method for Determining the Focal Size of Iridium-192 Industrial Radiographic Sources
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Scope
1.1 This test method covers the determination of the focal size of an iridium-192 radiographic source. The determination is based upon measurement of the image of the iridium metal source in a projection radiograph of the source assembly and comparison to the measurement of the image of a reference sample in the same radiograph.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Significance and Use
One of the factors affecting the quality of a radiographic image is geometric unsharpness. The degree of geometric unsharpness is dependent upon the focal size of the source, the distance between the source and the object to be radiographed, and the distance between the object to be radiographed and the film. This test method allows the user to determine the focal size of the source and to use this result to establish source to object and object to film distances appropriate for maintaining the desired degree of geometric unsharpness.
Keywords
cylinder(s); focal size; iridium 192; radiographic source; reference sample; sphere; ICS Number Code 19.100 (Non-destructive testing)
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03.03 (Nondestructive Testing)
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Document Number
ASTM-E1114-03
Revision Level
2003 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
March 10, 2003
Document Type
Test Method
Page Count
5 pages
Committee Number
E07.01