We demonstrate that stacking several imaging plates (IPs) constitutes an easy method to increase hard x-ray detection efficiency. Used to record x-ray radiographic images produced by an intense-laser driven hard x-ray backlighter source, the IP stacks resulted in a significant improvement of the radiograph density resolution. We attribute this to the higher quantum efficiency of the combined detectors, leading to a reduced photon noise. Electron-photon transport simulations of the interaction processes in the detector reproduce the observed contrast improvement. Increasing the detection efficiency to enhance radiographic imaging capabilities is equally effective as increasing the x-ray source yield, e.g., by a larger drive laser energy.
Improvement of density resolution in short-pulse hard x-ray radiographic imaging using detector stacks
B. Borm, F. Gärtner, D. Khaghani, P. Neumayer; Improvement of density resolution in short-pulse hard x-ray radiographic imaging using detector stacks. Rev. Sci. Instrum. 1 September 2016; 87 (9): 093104. https://doi.org/10.1063/1.4961666
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