A new type VUV detector with plane electrodes deposited on a crystalline quartz has been fabricated and evaluated. The external quantum efficiency of the detector was measured for radiation between 45 nm and 140 nm, and has a maximum value of about four percent at 70 nm. The fundamental absorption edge of the crystalline quartz is found to be at 150 nm. The noise equivalent power for this detector is about 1.25×10
-11 W. The detector was employed on trial to measure the helium discharge spectrum, and has given satisfactory results.
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