SIMPLE 10 eV-PHOTON DETECTOR
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Vacuum ultraviolet radiation of an energy around 10 eV is detected with a Geiger-Muller type counter [1, 2] comprising a stainless steel tube 1 closed at one end by a calcium fluoride window 2 and at the other enlarging into an extension 3 which is closed by a flange 4. Melted into a glass-KOVAR* feedthrough 5 of flange 4 is an etch-cleaned tungsten wire 6. Window 2 is glued to tube 1 with a low-vapor-pressure ultra-high vacuum glue 7 covered with graphite to avoid charging. Flange 4 rests against a rubber ring 8 which, in turn, rests against a shoulder 9 of extension 3 of tube 1, providing a seal for a 10-7 mbar or better vacuum. Extension 3 has a compartment 10 connected to it for receiving an ampoule 11 filled with purified iodine.