X-ray Induced Pinhole Closure in Point Projection X-ray Radiography

Bullock, A B; Landen, O L; Blue, B E; Edwards, J; Bradley, D K

doi:10.1063/1.2229737

Title: X-ray Induced Pinhole Closure in Point Projection X-ray Radiography

Journal Article · Fri Jan 13 00:00:00 EST 2006 · Journal of Applied Physics, vol. 100, no. 4, August 15, 2006, pp. 043301

DOI:https://doi.org/10.1063/1.2229737· OSTI ID:898453

Bullock, A B; Landen, O L; Blue, B E; Edwards, J; Bradley, D K

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 timescale 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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 898453

Report Number(s):: UCRL-JRNL-218415; TRN: US200706%%68

Journal Information:: Journal of Applied Physics, vol. 100, no. 4, August 15, 2006, pp. 043301, Journal Name: Journal of Applied Physics, vol. 100, no. 4, August 15, 2006, pp. 043301

Country of Publication:: United States

Language:: English

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Title: X-ray Induced Pinhole Closure in Point Projection X-ray Radiography

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