Time responses of output luminescence of an image amplifier were measured as to stepwise and square wave X-ray input. Also measured were the time response of input screen and output screen, the elements of an image amplifier.
The temporal modulation transfer function of the image amplifier and the relation between the background luminescence of the image amplifier and the frequency of square wave X-ray input were studied.
About the stepwise X-ray input, it was found that the more intense X-ray inputs give the hater time responses of the image amplifier and that the output luminescence of an image amplifier in steady state is proportional to the input intensity.

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