Abstract:
Ce dispositif comprend une fibre optique (4), un cristal détecteur (10) dont une extrémité est optiquement couplée à la fibre optique et qui est apte à émettre, par interaction avec le rayonnement (2), une lumière se propageant ensuite dans la fibre optique, et une gaine optique (12) qui entoure le cristal détecteur, qui est en contact optique avec celui-ci et dont l'indice optique est inférieur à celui du cristal détecteur, de manière à confiner ladite lumière, par réflexion totale. Application à la dosimétrie.
Abstract:
A wave guide face plate for transmitting an image formed in a scintillating material included as part of a transmitting medium is disclosed. The transmitting medium includes a random distribution of different refractive index regions in two orthogonal dimensions, and an essentially consistent refractive index in a third orthogonal dimension. The third orthogonal direction is aligned with a transmission axis of the wave transmitter extending from an input location to a wave detector location. The transmission efficiency of the wave guide faceplate is improved in situations where the entry angle of the input radiation is different from the axis of the wave transmitter as compared to conventional faceplates.
Abstract:
Embodiments of a solid state photomultiplier are provided herein. In some embodiments, a solid state photomultiplier may include a microcell configured to generate an analog signal when exposed to optical photons, a quench resistor electrically coupled to the microcell in series; and a first switch disposed between the quench resistor and an output of the solid state photomultiplier, the first switch electrically coupled to the microcell via the quench resistor and configured to selectively couple the microcell to the output.
Abstract:
Fibre optique (1) en verre photosensible à section rectangulaire dans laquelle le rayon de courbure d'un angle de la section rectangulaire est inférieur à 100 micromètres.
Abstract:
An imaging device (100) and an imaging method are described herein. By way of example, the imaging devices (100) includes a scintillator plate (200) configured to convert incident radiation into scintillation light and an imaging element (110) configured to convert the scintillation light to an electric signal. The scintillator plate (100) includes a first scintillator partitioned from a second scintillator by a divider in a direction perpendicular to a propagation direction of the incident radiation. The divider prevents first scintillation light generated in the first scintillator from diffusing into the second scintillator and second scintillation light generated in the first scintillator from diffusing into the first scintillator.
Abstract:
Described is a scintillator screen including a plurality of filaments. Each of the plurality of filaments includes scintillating particles dispersed within a thermoplastic polymer. The thermoplastic polymer includes an elastic additive. The scintillating particles are from about 10 volume percent to about 60 volume percent of each of the plurality of filaments. Each of the plurality of filaments has a refractive index of greater than or equal to 1.5. The plurality of filaments are substantially parallel to each other and are at a volume packing of from about 60 percent to about 90 percent.
Abstract:
Provided is a scintillator having a function of waveguiding scintillation light to a photodetector and having a structure for increasing an amount of absorption of radiation. The scintillator has a first surface and a second surface which are not located on a same surface, and includes: a first phase; and a second phase having a refractive index higher than that of the first phase and having a linear attenuation coefficient different from that of the first phase, in which one of the first phase and the second phase includes multiple columnar portions arranged in a direction from the first surface to the second surface, and the multiple columnar portions are stacked in a state in which end faces of the columnar portions are partly offset with respect to each other in a direction parallel to the first surface or the second surface.
Abstract:
A radiation detection apparatus can include a radiation sensor having a corresponding radiation sensing region, and a photosensor that is optically couple to the radiation sensor. The radiation sensing region can include optical fibers. In an embodiment, some or all of the optical fibers can be coated. The coating can include a phosphorescent material. In an embodiment, the optical fibers can be arranged in a manner such that optical substrates have substantially no bends.
Abstract:
A radiation detector (24) for an imaging system includes a two-dimensional array (50) of nondeliquescent ceramic scintillating fibers or sheets (52). The scintillating fibers (52) are manufactured from a GOS ceramic material. Each scintillating fiber (52) has a width (d2) between 0.1 mm and I mm, a length (h2) between 0.1 mm and 2mm and a height (h8) between 1mm and 2mm. Such scintillating fiber (52) has a height (h8) to cross-sectional dimension (d2, h2) ratio of approximately 10 to 1. The scintillating fibers (52) are held together by layers (86, 96) of a low index coating material. A two-dimensional array (32) of photodiodes (34) is positioned adjacent and in optical communication with the scintillating fibers (52) to convert the visible light into electrical signals. A grid (28) is disposed by the scintillating array (50). The grid (28) has the apertures (30) which correspond to a cross-section of the photodiodes (34) and determine a spatial resolution of the imaging system.
Abstract:
The invention relates to a two-dimensional ionising particle detector comprising a matrix of detecting fibres, each detecting fibre forming a pixel of the detector. One detecting fibre comprises a glass capillary which is filled with liquid scintillator having a chemical composition which is selected such that the mean free path of primary scintillation photons is negligible compared to the diameter of the capillary (d). The invention is suitable, for example, for the imaging of particles with high resolution power.