Abstract:
A UV detector (10) has a UV detection thin film of coated spherical silicon nanoparticles formed upon a substrate (12). The detector includes structures to bias the thin film. In preferred embodiments, a thin conductor (18) that is at least semi-transparent to UV radiation is formed over the thin film. In preferred embodiments, the UV detector is formed as a silicon based integration, upon a device quality silicon wafer (40).
Abstract:
Die Erfindung betrifft eine Detektorplatte bestehend aus einer, insbesondere spritzgegossenen, Trägerplatte mit einer Mehrzahl von Detektorelementen zur Detektion ionisierender Strahlung. Die Detektorelemente funktionieren gemäß dem Prinzip eines Geiger-Müller-Zählers, wobei nunmehr die Erfindung zur Vereinfachung des Herstellungsprozesses und zur Kostenersparnis vorschlägt, dass die Anode und/oder die Kathode als nicht in einer einzigen Ebene liegenden Metallisierung auf der Trägerplatte der Detektorplatte ausgebildet sind/ist. Auf diese Weise ergeben sich vielfältige Möglichkeiten den als Ionisationskammer verwendeten Innenraum auszubilden und die Elektroden in diesem Raum anzuordnen. Auch die Kontaktierungsmöglichkeiten mit weiteren Leiterplatten stellen sich als sehr vorteilhaft heraus. Dies wirkt sich ebenfalls vorteilhaft auf den Herstellungsprozess aber auch auf die Qualitäten der Strahlungsmessgeräte aus, die derartige Detektorplatten verwenden.
Abstract:
L' invention concerne un capteur Geiger-Muller comprenant un tube cylindrique (17) contenant un gaz sous pression et muni de deux électrodes (18a, 18b), un câble coaxial (15) ayant une âme et une tresse de masse conductrice, l'âme étant électriquement reliée à une première électrode et la tresse de masse conductrice étant électriquement reliée à la deuxième électrode, caractérisé en ce que les première et deuxième électrodes sont électriquement isolées l'une de l'autre, en ce que les liaisons de l'âme conductrice et de la tresse de masse conductrice avec les électrodes respectives sont des liaisons par soudure et en ce qu'une une gaine thermo-rétractable (G) enveloppe et enserre complètement le tube cylindrique, les électrodes et la partie du câble coaxial (15) située à proximité des électrodes. Application à la mesure instantanée de débits de dose en temps réel.
Abstract:
Various embodiments are described herein for sensors that may be used to measure radiation from radiation generating device. The sensors may use a collector plate electrode with first and second collection regions having shapes that are inversely related with one another to provide ion chambers with varying sample volumes along a substantial portion of the first and second collection regions which provides virtual spatial sensitivity during use.
Abstract:
The present invention provides a method for manufacturing radiation detectors such as Geiger-Müller detectors. The method includes pre-forming a frit ring via extrusion or stamping. The preformed frit ring is placed in the aperture of a metal cathode body along with a radiation transparent window made of mica. The window is slightly larger than the perimeter of the aperture, thereby forming an overlap area. The frit ring is placed between the cathode and window within this overlap area. The assembled components are then fired at an appropriate temperature to cause fusion of the frit with the metal cathode and window to form a gas-tight seal.
Abstract:
A Geiger-Muller tube designed for use in an environment (for example, mounted on a rock drill) where subjected to mechanical shock and vibration has a tensioned anode wire (1) secured between first and second mounts (11,21) and (12,22) at opposite ends of the tube envelope. The wire tension is adjusted to a high value with a screwible-adjustment means (22,23,24) which is locked (*25) in the adjusted position, so that the natural frequency of vibration of the tensioned wire 1 does not resonate with (and may be much higher than) the frequencies to which the tube is subjected in use. The wire frequency is typically in excess of 400Hz and even 500Hz. The adjustment means (22,23,24) may be included in the mount (12,22) via which the envelope is evacuated and back-filled with the ionizible gas, and a gas-tight seal (30) can be provided around this part of the mount (12,22), for example by sealing off the gas pump tube. However the adjustment means may be designed into another part of the tube, for example using telescopic parts of the envelope whose sliding junction is made gas tight with a flexible seal.
Abstract:
For simultaneously measuring the radioactivity of multiple samples arranged in a predetermined array of x rows and y columns, a fixed array of radiation counters arranged in the same array of x rows and y columns so that one of the counters is aligned with each of the multiple samples. Each of the counters has a pair of spaced electrodes; an electrical voltage source connected to the electrodes of all the counters for applying the same voltage across the electrodes of each of the radiation counters in the array; and sensing means connected to the electrodes of each of the radiation counters for independently detecting pulses of electrical current produced by ionization of the gas between the respective pairs of electrodes of each of the radiation counters. For measuring low-energy radiation, the radiation counters are windowless, a flow of ionizable gas is supplied to the counters, and the same flow rate of the ionizable gas is maintained through each of the radiation counters in the array. Preferably the radiation counters are formed in a metal plate that provides shielding to minimize "cross talk" between adjacent samples.