If the level of light to be detected is extremely low, look into photomultipliers.  Wavelength sensitivity is set by the materials used for the photocathode.  The material will be a metal, and will thus not degrade under the influence of the UV light like plastic or semiconductor material will.  If the amount of light to be detected is large, try using a thermocouple detector, again with a metallic coating for the actual absorption of the light quanta.  There is a large selection for each type of detector, so you can optimize to your application.

Since you have high energy concentration, the simplest would
be to use a regular simple vacuum UV photocell. I think metallic Zn would be the ideal cathode -- you could just measure the saturation current.

<nbucska@pcperipherals.com>

UV enhanced photodiodes will work and are generally less expensive the most UV Pototubes.  Check out Edmund Scientific.