We have studied the response of a Xe-solid reflexion photocathode in a wide spectral range, from 5 key to 1.3 Mev. We compared the measured sensitivity to the gold photocathode one, in the same conditions, and found gains up to 1200 at 45 key, The linearity of the response and the gain obtained, even with this simple test experiment, enable us to envisage further developments of x-ray detectors with high efficiency and good time resolution.
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