Abstract
ABSTRACT The equivalent quantum efficiency of a charge storage tube using thermionic signal amplification is discussed. The performance of a photocathode-scanned charge-integrating storage tube using slow speed read out is assessed. The tube is capable of integration and storage of charge pictures for long periods without deterioration. On read out, when the phosphor noise is suppressed by negative feedback, the total noise corresponds very closely with the expected fluctuations in the stored charge. The device is not suitable for the observation of low contrast images of small objects because of the inadequate resolution of the scanning system and the degradation of contrast due to the redistribution of the secondary electrons in the tube.
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