Experimental Characterisation Of Kodak Direct Exposure Film (Def) Up To High Optical Density (-7) And Application To The Analysis Of Laser-Produced Plasma Generated X-Ray Images

K. Oades; D. S. Mather; G Murray; C. Bentley; J. C. V. Hansom; P. Fieldhouse; T. J. Goldsack

doi:10.1117/12.961808

27 November 1989 Experimental Characterisation Of Kodak Direct Exposure Film (Def) Up To High Optical Density (~7) And Application To The Analysis Of Laser-Produced Plasma Generated X-Ray Images

K. Oades, D. S. Mather, G Murray, C. Bentley, J. C. V. Hansom, P. Fieldhouse, T. J. Goldsack

Author Affiliations +

Proceedings Volume 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation; (1989) https://doi.org/10.1117/12.961808
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

Photographic films are used in conjunction with many of the X-ray diagnostics deployed on experiments performed by AWE at their HELEN laser and in collaborative experiments at the LLNL NOVA laser; for many applications the detailed response of the film being used is required. A Perkin-Elmer Micro-10 microdensitometer, with semi-specular optics, is currently employed to digitise these image data prior to further processing and analysis. At present the favoured film for applications where high sensitivity is required is KODAK Direct Exposure Film (DEF). Detailed characterisation of this film, in the optical density range 0 - 3, along with simple analytical models to predict its response, have been reported by workers at other laboratories. Radiographs obtained during the AWE experiments, particularly at the NOVA laser, routinely include optical densities of 5, occasionally reaching above density 6. In order to allow quantitative information to be extracted from these radiographs a characterisation at three energy points in the range 1 - 5 keV has been performed at the AWE X-ray calibration facility EXCALIBUR. These results are presented along with fits to the analytical model presented by Henke et al in Reference 1. The Henke model was used to generate a detailed response curve at a photon energy of 2.5 keV in order to analyse an experimental radiograph from the NOVA laser. The effect of the shape of the response curve on the quantities being measured is demonstrated.

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K. Oades, D. S. Mather, G Murray, C. Bentley, J. C. V. Hansom, P. Fieldhouse, and T. J. Goldsack "Experimental Characterisation Of Kodak Direct Exposure Film (Def) Up To High Optical Density (~7) And Application To The Analysis Of Laser-Produced Plasma Generated X-Ray Images", Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989); https://doi.org/10.1117/12.961808

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