Abstract
The successful operation of a multistage image intensifier using a series of aluminum dynodes coated with thin layers of BaF/sub 2/ and reinforced with very fine wide-mesh grid ia reported. The electron gain in the best of these tubes is 2400, corresponding to sn average secondary emission ratio of 7 per dynode. The photon gsin with 15kw acceleration from the last dynode to a P11 output phosphor is about 10,000. At low light levels, resolution is limited by photoelectron noise. This tube, when fully developed, will be well suited to the amplification of extremely low light level images such as those encountered in astronomy, nuclear particle track photography, spectroscopy, and x-ray fluoroscopy. (D.L.C.)
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