Photon CT scanning of advanced ceramic materials

Conference · Wed Oct 01 04:00:00 EDT 1986

OSTI ID:7200675

Sawicka, B D; Ellingson, W A

Computed tomography (CT) using a high energy (1.25 MeV) photon source has been employed to image two specimens of sintered alumina ceramic. Because a monoenergetic source was used the absolute values of the densities could be measured to a high accuracy. High contrast (low noise) CT images were obtained permitting density measurement within each pixel to be determined with an accuracy of better than 1%. The average densities in regions encompassing several pixels have been determined with an accuracy of 0.2%. Porous regions and long-range density gradients were observed and quantified. Higher spatial resolution and still better contrast of the CT image could be obtained, however at the expense of the scan time. Good agreement was obtained for the two imaging techniques (CT and contact radiography), although both techniques showed slightly different features in the objects under study and therefore complement each other.

• Research Organization: Atomic Energy of Canada Ltd., Chalk River, Ontario. Chalk River Nuclear Labs.; Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7200675
• Report Number(s): CONF-860856-8; ON: DE87001525
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360200 -- Ceramics
Cermets
& Refractories
42 ENGINEERING
420500* -- Engineering-- Materials Testing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAT SCANNING
CERAMICS
CHALCOGENIDES
COBALT 60
COBALT ISOTOPES
COMPUTERIZED TOMOGRAPHY
CRACKS
DEFECTS
DIAGNOSTIC TECHNIQUES
GAMMA RADIOGRAPHY
IMAGE PROCESSING
INDUSTRIAL RADIOGRAPHY
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATERIALS
MATERIALS TESTING
MINUTES LIVING RADIOISOTOPES
NONDESTRUCTIVE TESTING
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RADIOISOTOPES
SINTERED MATERIALS
TESTING
TOMOGRAPHY
USES
YEARS LIVING RADIOISOTOPES