ASTM-E545 › Historical Revision Information
Standard Test Method for Determining Image Quality in Direct Thermal Neutron Radiographic Examination
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Scope
1.1 This test method covers the use of an Image Quality Indicator (IQI) system to determine the relative quality of radiographic images produced by direct, thermal neutron radiographic examination. The requirements expressed in this test method are not intended to control the quality level of materials and components.
1.2 This standard does not purport to address 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.
1.3 The values stated in SI units are regarded to be standard.
Significance and Use
The BPI is designed to yield quantitative information concerning neutron beam and image system parameters that contribute to film exposure and thereby affect overall image quality. In addition, the BPI can be used to verify the day-to-day consistency of the neutron radiographic quality. Gadolinium conversion screens and single-emulsion silver-halide films, exposed together in the neutron imaging beam, were used in the development and testing of the BPI. Use of alternative detection systems may produce densitometric readings that are not valid for the equations used in Section 9.
The only truly valid sensitivity indicator is a reference standard part. A reference standard part is a material or component that is the same as the object being neutron radiographed except with a known standard discontinuity, inclusion, omission, or flaw. The sensitivity indicators were designed to substitute for the reference standard and provide qualitative information on hole and gap sensitivity.
The number of areas or objects to be radiographed and the film acceptance standard used should be specified in the contract, purchase order, specification, or drawings.
Keywords
beam purity indicator; direct method; image quality indicator; neutron radiography; sensitivity indicator; ICS Number Code 19.100 (Non-destructive testing)
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03.03 (Nondestructive Testing)
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Document Number
ASTM-E545-05
Revision Level
2005 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
June 1, 2005
Document Type
Test Method
Page Count
4 pages
Committee Number
E07.05