DEVICE FOR OBSERVING ULTRAVIOLET RAY IMAGE COEXISTING WITH VISIBLE RAY IMAGE

摘要

PURPOSE:To obtain a device usable for observation or the like of an image by means of ultraviolet rays contained in Chelenkov radiation originated in used nuclear fuel stored in water under illumination by maintaining and multiplying twodimensional distribution of photoelectrons emitted from the photoelectric plane having sensitivity in the range of ultraviolet rays while converting its electronic image into a visible image. CONSTITUTION:A plane of incidence of an airtight container of an ultraviolet ray image intensifying device 2 forms a window 20 by using MgF2 showing en excellent transmittive characteristic for ultraviolet rays. A photoelectric plane 21 emits a photoelectric image corresponding to an ultraviolet ray image by means of the ultraviolet ray image imaged on the CsTe photoelectric plane 21 through said window 20. Said electronic image is imaged on a microchannel plate 25 by an electron lens system consisting of a focusing electrode 23 and an anode 24 after being accelerated by an acceleration mesh electrode 22, while the electronic image here multified is emitted from an output plane of the microchannel plate 25 for being collided with a phosphor plane 26 after being accelerated by further higher voltage. As a result, the ultraviolet ray image is converted into a visible image intensified by nearly 10-40 thousands. Said visible image can be observed through an ocular.