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By J.D. McGee and W.L. Wilcock (Eds.)

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The results were reduced to terms of signal-to-noise performance by making microphotometer tracings of the images. The effectiveness of barrier-membranes can be judged from Fig. 3. "- 0 5 2Y 4- . = n I i = * * * . i cn 2- IC. 1- . Diffusion pump 0. 0. * t * 0 I 10 I cutoff 0 . Tube B1 I I I I 8. 20 30 40 50 60 Elapsed hours from decopitotion .. 3. Life data for two barrier-membrane tubes. The zensitivity of B1 changed very little until the external pressure was increased 1000-fold. The photocathode of B5 increased somewhat in sensitivity during the first thirty hours, due probably to an initially favorable oxidation.

Or 450 electrons/sec. 1 second intervals. S. 1 second. This fluctuation in first-cathode current then constitutes the fluctuation noise which is seen in the screen; it is just a t the threshold of detectability and can be observed with an ocular of the proper magnification. The noise of the screen is greatly increased if a small amount of gas is present in the tube. This increase is caused by the fact that positive ions formed by the accelerated photoelectrons, or thermal electrons, are focused by the electric field in the tube on a small area a t the center of the photocathode.

6 x cmz) can be resolved with a 10-power magnifier. , or 450 electrons/sec. 1 second intervals. S. 1 second. This fluctuation in first-cathode current then constitutes the fluctuation noise which is seen in the screen; it is just a t the threshold of detectability and can be observed with an ocular of the proper magnification. The noise of the screen is greatly increased if a small amount of gas is present in the tube. This increase is caused by the fact that positive ions formed by the accelerated photoelectrons, or thermal electrons, are focused by the electric field in the tube on a small area a t the center of the photocathode.

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