Abstract
This chapter discusses development of an image tube with Lenard window. In this tube, the electron image emitted from a photoemissive cathode is accelerated to sufficient energy to penetrate a thin mica window which is capable of withstanding atmospheric pressure. The electron image is recorded on an electron sensitive emulsion, which is held in close contact with the outside of the window. This device has the following advantages: (1) because the tube is sealed off, it should have a long life; (2) no special preparation is required before the tube is put into operation; (3) there is no predetermined limit to the number of exposures that can be made; (4) the tube does not require any auxiliary pumping equipment. This tube has a satisfactory performance as regards gain, geometry and resolution, however is characterized by an extremely high background even at operating voltages as low as 2 kV. It was observed, however, that this background did not occur when the magnetic field was removed.
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