Fluorescent transilluminator requiring no visible light-cutting filter

A fluorescent transilluminator, which irradiates an electrophoretically treated gel stained with fluorescent substance with ultraviolet rays having a wavelengths ranging from 280 to 315 nm, wherein a transmission window, which passes light of wavelengths equal to or longer than 300 nm ranging from the ultraviolet region to the visible light region, is installed between the ultraviolet source housed in the fluorescent transilluminator and said electrophoretically treated gel.

A fluorescent transilluminator housing an ultraviolet source and emitting ultraviolet rays from said ultraviolet source to an outside object to be irradiated, wherein

• said ultraviolet source has a fluorescent body which is activated by gadolinium and emits ultraviolet rays;
• an excitation source which excites said fluorescent body through xenon discharge to make said fluorescent body fluoresce;
• and a plate-like external shape, wherein a member constructing an emission surface of said ultraviolet source forms a portion of an outer surface of the fluorescent transilluminator.