X-Ray Digital Radiography and Computed Tomography applied to Cultural Heritage, Medicine and Industrial applications

The EBCCD used in this work was produced by the Geosphaera Research Center of Moscow.
It has a 1” diameter sensitive area (multi-alkali photocathode) and a high-voltage intensifier tube (ranging from 5 to 15 kV). The electrons, accelerated in the EBCCD tube, impinge on a 1024 x 512 pixel CCD. The sensitivity of the EBCCD to visible light is very high; good images can be obtained with 10-5 lux. 
The high sensitivity of the EBCCD camera allowed us to use a very low radiation intensity to achieve a significant response. To obtain a linear detector, a coherent fiber optics guide, comprising seven separate bundles, was used. The seven bundles (18.4 mm x 1.45 mm) were aligned on the input side to form the linear part of the detector and superimposed on the output side. The guide was designed to link up perfectly with the 1” photocathode of the EBCCD. A thin strip of a gadolinium-oxysulfide screen was attached to the linear part of the FO guide to obtain a linear detector (128.8 mm long and 1.45 mm high). The designed linear geometry is appropriate for beam collimation and further reduction of diffused radiation, resulting in better image contrast. The set-up of the system is shown in Figure.


 
 
 

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