Gating of microchannel plates (MCPs) can produce shutter times of less than 40 ps. This is accomplished with high-fidelity electronic circuitry and short pulse (sub 80 ps) high-amplitude electronic drivers. Measurements have shown that the fidelity of the electrical circuitry is one of the limiting factors in producing shorter x-ray gating.
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Bell et al. (1992) studied this question.