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

被引：15

作者：

Bullock, A. B. ^{[1
]}

Landen, O. L. ^{[1
]}

Blue, B. E. ^{[1
]}

Edwards, J. ^{[1
]}

Bradley, D. K. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2006年 / 100卷 / 04期

关键词：

D O I：

10.1063/1.2229737

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (c) 2006 American Institute of Physics.

引用

页数：7

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