Standard Practice for Determining Image Unsharpness and Basic Spatial Resolution in Radiography and Radioscopy for High Energy Applications

Importancia y uso:

5.1 The gauge is intended to provide a means for measuring image or detector unsharpness and basic spatial image or detector resolution as independently as practicable from the imaging system and contrast sensitivity limitations. When the duplex plate gauge is positioned directly on the film or the digital detector instead on the test object, then the determined image unsharpness U_Im corresponds to the inherent film or detector unsharpness (U_detector) and the determined basic spatial image resolution SR_b^image corresponds to the basic spatial detector resolution SR_b^detector. SR_b^image provides a value which depends on the combined effect of detector unsharpness and geometric unsharpness.

5.2 Basis of Application: 

5.2.1 The following items are subject to contractual agreement between the parties using or referencing this standard.

5.2.1.1 Personnel Qualification—Personnel performing examinations to this practice shall be qualified in accordance with NAS410, EN 4179, ANSI/ASNT CP 189, ISO 9712, or SNT-TC-1A and certified by the employer or certifying agency as applicable. Other equivalent qualification documents may be used when specified on the contract or purchase order. The applicable revision shall be the latest unless otherwise specified in the contractual agreement between parties.

5.2.1.2 If specified in the contractual agreement, NDT agencies shall be qualified and evaluated as described in Specification E543. The applicable edition of Specification E543 shall be specified in the contract.

Subcomité:

E07.01

Volúmen:

03.04

Número ICS:

19.100 (Non-destructive testing)

Palabras clave:

basic spatial resolution; gamma ray; imaging system; line pairs per mm; radiation; unsharpness; X-ray;