Abstract: In order to obtain suitable absorption of the radiation to be detected in the detector gas of a radiation detector, in particular an X-ray detector, the detector is constructed in such a way that the radiation enters the detector parallel to the counting wire, thus offering an absorption path having any desired length. According to the invention, a number of avalanche chambers 50 is arranged adjacent the absorption chamber 46, said avalanche chambers having a comparatively small cross-section. The avalanche chambers are provided with grids 54 in such a way that charge multiplication by the grid voltage can occur only in the avalanche chamber. Due to the comparatively small cross-section of the avalanche chambers, broadening of the current impulses to be detected is prevented. Moreover, the comparatively long absorption chamber offers good radiation absorption and the presence of several avalanche chambers enables a favourable detection rate.

Abstract: An infrared photosensitive area is constituted by an infrared ray absorbing part that is heated by infrared rays, a thermal detector that detects the temperature change of the infrared ray absorbing part, and electrodes that are electrically connected to the thermal detector. The infrared photosensitive area is held up above one surface of a substrate by supports. The electrodes of the infrared photosensitive area are electrically connected to contact pads on the substrate by wiring material that constitutes the support. A shield projects from portions of the infrared ray absorbing part other than portions that correspond to the electrodes. The contact pads of the substrate and the surfaces of the electrodes and the supports that are directed away from the substrate are covered by the shield with an interposed space. This configuration enables an increase in the fill factor of the picture elements of the thermal infrared detector and enables greater absorption of infrared light.

Abstract: A radiation image read-out apparatus including a lens array and a line sensor for reading an image recorded on a stimulable phosphor sheet provides a read-out image of high quality which is free from a spurious pattern due to non-aperture regions of the lens array. A first memory stores an image signal representing the image recorded on the stimulable phosphor sheet. Spurious pattern signal calculating means calculates a spurious pattern signal based on positions of the non-aperture regions on the lens array. The spurious pattern signal is stored in a second memory. Image modification means reads the image signal and the spurious pattern signal from the first and second memories to calculate a processed image signal free from any spurious pattern signal on a pixel-by-pixel basis. The spurious pattern signal may instead be obtained by causing the apparatus to read a uniform radiation image recorded on the stimulable phosphor sheet.

Abstract: A planar image detector for electromagnetic radiation has radiation-sensitive pixel elements arranged in a matrix that has a surface with active pixels for imaging and a surface with correction pixels, not exposed to the radiation for generating correction signals, and with contact surfaces next to the surfaces with the pixels. The surface with the correction pixels is arranged in a different plane from the surface with the active pixels and at one of the sides of the image detector with the contact surfaces of the active pixels.

Abstract: The present invention relates to an ultraviolet radiation detector in general and more specifically to a solar blind ultraviolet radiation detector; that is, a detector insensitive to the radiation of sunlight reaching the earth's surface but sensitive to UVC wavelengths in the spectrum, defined as the interval 200 nm-280 nm. The solar blind detector is base on the use of photochromic compounds in conjunction with ultraviolet wavelength-selective chemical blocks and their incorporation into optically clear polymer matrices. The photochromic compound is selected from the group comprising spiropyran molecules spirooxazine molecules and chromene derivatives. Applications for such device are as numerous as the sources of UVC radiation. An obvious use for such Solar Blind UVC detector is monitoring the output of UVC sources used in the decontamination of water and air (water treatment and air purification) and for sterilization of medical instruments.

Abstract: The surface state monitoring apparatus comprises: a wafer cassette holding a plurality of semiconductor wafers; an incidence optical system for applying infrared radiation to at least one of said plurality of semiconductor wafers; a detection optical system for detecting the infrared radiation which has undergone multiple reflection in the semiconductor wafer and exited from the semiconductor wafer; surface state monitoring means for monitoring surface states of the semiconductor wafer, based on the infrared radiation detected by the detection optical system; and displacing means for displacing the wafer cassette relative to the incidence optical system and the detection optical system.

Abstract: A photosensitive matrix sensor include a faceplate of caesium iodide CsI mounted on a graphite base so as to transform high-frequency radiation, X-ray radiation, into low-frequency radiation, in the visible spectrum. It is shown that if the CsI is grown on such a graphite base, a sensor with much better resolution and much better sensitivity is obtained than if a gadolinium oxysulphide scintillator were used. Precautions in preparing the graphite may furthermore be taken rendering the surface of the graphite denser. It can thus be covered with a layer of amorphous carbon and or be made to undergo impregnation. This densification contributes to the homogeneity of the sensor. Protection of the CsI is then effected by a synthetic resin layer allied with a layer of liquid resin for optical coupling with a detector.

Abstract: A continuous rotation sampling scheme for use with a nuclear medicine gamma camera facilitates collection of transmission and emission data leading to a reduced overall scan time. The gantry (16) contains a plurality of radiation detector heads (20a-20c) with planar faces and at least one adjustably mounted radiation source (30a). During transmission data collection, the gantry (16) continuously rotates about a subject receiving aperture (18) while the radiation source (30a) continuously rasters back and forth across the field of view. The detected transmission radiation (32a) is reconstructed into an attenuation volumetric image representation by a transmission reconstruction processor (64t). The transmission reconstruction processor (64t) performs a fan beam reconstruction algorithm in each of a multiplicity of planes perpendicular to an axis of rotation.