1 June 1991 MCP image intensifier in the 100-KeV to 1-MeV x-ray range
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A high gain x-ray image intensifier with high sensitivity in the 1 MeV x-ray range is presented and a good spatial resolution developed in order to improve the radiographic detection in the experiments. In particular the gold photocathode and MCP thickness have been optimized to give the best trade-off between the dose sensitivity and the spatial resolution. The large useful 60 mm diameter photocathode set on the MCP input converts the x-ray emission into electrons which are multiplied in the MCP and proximity-focused onto the P11 phosphor screen deposited on a fiber optic plate. For x-ray quanta of 1 MeV energy the x-ray image converter is more sensitive than the most sensitive x-ray screen-film systems. Using, for instance, a pulsed x-ray source the authors were able to record pictures of a sphere or of a testing metallic chart for a dose lower than 100 (mu) rad; under these conditions the spatial resolution was greater than 1 lp/mm and the dynamic range was still around 10. Using an x-ray screen film under the same input level the authors have obtained a very low dynamic range and density values actually equal to the noise level. These unique performances fulfill the requirements of a large number of detonic experiments needing a high sensitivity in the 1 Mev x-ray range.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacqueline Veaux, Jacqueline Veaux, Claude Cavailler, Claude Cavailler, Jean-Pierre Gex, Jean-Pierre Gex, Alain Hauducoeur, Alain Hauducoeur, M. Hivernage, M. Hivernage, "MCP image intensifier in the 100-KeV to 1-MeV x-ray range", Proc. SPIE 1449, Electron Image Tubes and Image Intensifiers II, (1 June 1991); doi: 10.1117/12.44261; https://doi.org/10.1117/12.44261

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