X-ray induced pinhole closure in point-projection x-ray radiography

Journal Article · Tue Aug 15 00:00:00 EDT 2006 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2229737· OSTI ID:20880003

Bullock, A B; Landen, O L; Blue, B E; Edwards, J; Bradley, D K ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

In pinhole-assisted point-projection x-ray radiography (or 'backlighting'), pinholes are placed between the sample of interest and an x-ray source (or 'backlighter') to effectively limit the source size and hence improve the spatial resolution of the system. Pinholes are generally placed close to such x-ray backlighters to increase the field of view, leading to possible vaporization and pinhole closure due to x-ray driven ablation, thereby potentially limiting the usefulness of this method. An experimental study and modeling of time-dependent closure and resolution is presented. The pinhole closure time scale is studied for various pinhole sizes, pinhole-to-backlighter separations, and filtering conditions. In addition the time-dependent resolution is extracted from one-dimensional wire imaging prior to pinhole closure. Cylindrical hydrodynamic modeling of the pinhole closure shows reasonable agreement with data, giving us a predictive capability for pinhole closure in future experiments.

• OSTI ID: 20880003
• Journal Information: Journal of Applied Physics, Vol. 100, Issue 4; Other Information: DOI: 10.1063/1.2229737; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABLATION
CYLINDRICAL CONFIGURATION
LIGHT TRANSMISSION
PLASMA
SPATIAL RESOLUTION
TIME DEPENDENCE
X RADIATION
X-RAY RADIOGRAPHY
X-RAY SOURCES