Abstract: The present invention relates to a method of fabricating a radiation detector comprising a photosensitive sensor assembly (1, 4), a scintillator (6) that converts the radiation into radiation to which the photosensitive sensor assembly (1, 4) is sensitive, the scintillator (6) being fastened by adhesive bonding to the sensor assembly, the sensor assembly comprising a substrate (4) and several attached sensors (1), the sensors (1) each having two faces (11, 12), a first face (11) of which is bonded to the substrate (4) and a second face (12) of which is bonded to the scintillator (6). The method consists in linking the following operations: the sensors (1) are deposited via their second face (12) on an adhesive film (13); and the sensors (1) are bonded via their first face (11) to the substrate (4).

Abstract: A solid-state radiation detector comprises a photosensitive sensor associated with a radiation converter or scintillator. The fields of application of this type of detector are notably radiology: radiography, fluoroscopy and mammography, but also nondestructive testing. The detector comprises a rigid entrance window passed through by the first radiation upstream of the scintillator, the scintillator being placed between the sensor and the entrance window, the sensor comprising a substrate and photosensitive elements placed on the substrate. According to the invention, the entrance window is shaped so as to closely fit the form of the scintillator and is fixed in a moisture-tight manner on the substrate of the sensor.

Abstract: The present invention relates to a method of fabricating a radiation detector comprising a photosensitive sensor assembly (1, 4), a scintillator (6) that converts the radiation into radiation to which the photosensitive sensor assembly (1, 4) is sensitive, the scintillator (6) being fastened by adhesive bonding to the sensor assembly, the sensor assembly comprising a substrate (4) and several attached sensors (1), the sensors (1) each having two faces (11, 12), a first face (11) of which is bonded to the substrate (4) and a second face (12) of which is bonded to the scintillator (6). The method consists in linking the following operations: the sensors (1) are deposited via their second face (12) on an adhesive film (13); and the sensors (1) are bonded via their first face (11) to the substrate (4).

Abstract: The present invention relates to a solid-state X-ray detector comprising a photosensitive sensor associated with a radiation converter, known as a scintillator, transforming the X-rays into a radiation to which the sensor is sensitive, and an entry window through which the X-rays pass upstream of the scintillator. The entry window is mounted on the scintillator, without being fixed to the scintillator, and the entry window and the sensor are fixed by a water vapor-tight seal. The scintillator consists of a support, distinct from the sensor, and a scintillating substance. The application areas of this type of detector are notably radiology (radiography, fluoroscopy and mammography), but equally, non-destructive testing.

Abstract: A solid-state X-ray detector comprising a photosensitive sensor combined with a radiation converter or scintillator is described. The radiation detector includes an entry window through which the X-rays upstream of the scintillator pass, and means for applying an electrical voltage between the entry window and the photosensitive sensor.

Abstract: A solid-state X-ray detector comprising a photosensitive sensor combined with a radiation converter or scintillator is described. The radiation detector includes an entry window through which the X-rays upstream of the scintillator pass, and means for applying an electrical voltage between the entry window and the photosensitive sensor.

Abstract: The present invention relates to a solid-state X-ray detector comprising a photosensitive sensor associated with a radiation converter, known as a scintillator, transforming the X-rays into a radiation to which the sensor is sensitive, and an entry window through which the X-rays pass upstream of the scintillator. The entry window is mounted on the scintillator, without being fixed to the scintillator, and the entry window and the sensor are fixed by a water vapor-tight seal. The scintillator consists of a support, distinct from the sensor, and a scintillating substance.

Abstract: A solid state photosensitive detector including a solid state photosensitive sensor associated with a converter designed to convert radiation to be detected into radiation to which the photosensitive sensor is sensitive. The photosensitive sensor includes one or more photosensitive elements connected to conductors and a passivation layer covering the photosensitive elements and the conductors to protect them. Between the passivation layer and the converter, a barrier is provided that is impermeable to at least one chemical species that is corrosive for the sensor, capable of being released by the converter during at least one chemical reaction. Such a detector may find particular application to radiation detectors for medical radiology.

Abstract: A process for leaktight sealing of a solid-state X-radiation detector. The detector includes an amorphous silicon detecting slab and a layer of scintillating substance. The slab has peripheral connection zones formed by the flexing of an anisotropic conducting film on the ends of conductive tracks arranged on the slab and external conductors. The flexing zone and at least the periphery of the scintillating layer are covered with an uninterrupted layer of impermeable material, for example by screen printing.

Abstract: A process for producing a radiation detector. A plurality of unitary elementary slabs are assembled on a positioning support. The slabs are adhesively bonded onto the common support. The bonding is carried out in two successive steps: a first step for sealing the inter-slab spaces without filling them entirely, and a second step intended to spread a film of adhesive over the entire surface of the assembled slabs. A subsequent step includes fitting the common support.

Abstract: Disclosed is a improvement in the fabrication of a scintillator, notably for the input screen of an X-ray image intensifier tube. According to the disclosure, the substrate on which a layer of scintillating material such as cesium iodide deposited in is made to grow is subjected to a treatment resulting in the formation of an alveolate structure or surface state, the consequence of which is the formation of thinner needles. The reduction of the mean diameter of the needles results in a improvement of the resolution of the device.

Abstract: An input screen scintillator for an X-ray image intensifier tube. The tube includes light conductive cesium iodide needles formed on an electrically conductive substrate. Each needle is entirely coated with a material such as a metal or a semiconductor which reflects the light travelling within the needle toward the inside of the needle. This coating can enhance the efficiency and resolution of the image intensifier tube.

Abstract: An image intensifying tube, such as a image intensifying tube which converts X-rays into a visible image, comprises a curved input screen which comprises a substrate that receives input radiation and a photocathode supported on the substrate, and an output screen which converts the electrons emitted by the photocathode into a visible image. In order to compensate for changes in luminosity due to the curvature of the input screen, an intermediary layer of radially variable thickness is deposited between the substrate and the photocathode. The intermediary layer is made from a material, such as indium oxide (In.sub.2 O.sub.3), which modifies the electron emitting characteristics of the photocathode as a function of the thickness the intermediary layer. Thus, a thicker intermediary layer near the center of the input screen will compensate for reduced luminosity at the edges of the screen.

Abstract: The disclosure concerns television cameras having an image pick-up electron tube. The signal input plate of the tube according to the invention is made by molding and a connection pin is embedded in the glass during the molding operation itself. When the internal and external faces of the input plate are then polished, the end of the pin on the internal side of the pin is levelled down at the same time. All that remains to be done then is to deposit a transparent conductive layer and a photoconductive target on this perfectly plane face. Furthermore, the unpolished edges of the input plate and, more particularly, its lateral edges are covered with a light-absorbing black layer which is produced not by the deposition of a black paint but by chemical reduction of the metal oxides contained in the glass. This blackening is preferably obtained during the molding operation itself, by placing the mold in a hydrogen-reducing atmosphere.

Abstract: An improved scintillator for an input screen of an X-ray image intensifier tube is disclosed which has a substrate on which there is deposited the scintillating material in the form of thin parallel needles. The face of the substrate having the scintillating materials has an alveolate surface state or has an alveolate structure. As a result of this structure there are thinner needles formed and the reduction in the diameter of the needles results in an improvement of the resolution of the device.

Abstract: The invention concerns an input screen scintillator for an X-ray image intensifier tube. This tube comprises light-conductive cesium iodide needles formed on an electrically conductive substrate. According to the invention, each needle is entirely coated with a material such as a metal or a semiconductor which reflects the light travelling within the needles and allows an identical potential level in the coating material as in the substrate towards the inside of said needles. The coating can enhance the efficiency and resolution of image intensifier tubes. The invention has applications in the field of X-ray imagery.

Abstract: The invention concerns a manufacturing process of a photocathode for an image intensifier tube.According to this process, the photocathode is made within the tube by depositing a photoelectric material on a conductive substrate by vacuum evaporation. During this operation, the optical transparency of the deposit is checked by illumination of this deposit by a light source. According to the invention, this light source is located within the tube and is protected from the vapors of the photoelectric material. In the prior art, this light source was located outside the tube and the illumination of the deposit was not sufficient.The invention has applications in the field of image intensifier tubes.

Abstract: Before being introduced within the intensifier, the grid which is nearest the anode is coated with a layer of electrically conductive material having the property of oxidizing alkali metals. This has the effect of elininating any parasitic illumination of the viewing screen caused by alkali metals unintentionally deposited on the grid at the time of formation of the photocathode.

Abstract: The present invention provides an input screen scintillator for a radiological image intensifier tube in which the cesium iodide needles of the scintillator are coated with a refractory, transparent of reflecting, material having an optical index close to or less than that of the cesium iodide. Different methods may be used for coating, such as chemical vapor phase deposition, activated by thermal excitation, plasma excitation or photonic excitation; or such as diffusion deposition of a colloidal solution; or such as polymerization of a polymer resin. After coating, is realized the heat treatment which ensures the luminescence of the screen.