Abstract:
L'invention concerne un radiochromatogramme à très haute résolution pour rayonnements ionisants. Le radiochromatogramme comporte au moins un réseau (R) constitué d'un ensemble d'éléments filiformes ou fibres optiques susceptible de permettre un repérage spatial d'une surface à analyser selon un repère d'axe déterminé et permettant d'assurer la détection par scintillation des rayonnements et la transmission du rayonnement lumineux produit par cette détection. Le réseau (R) est formé de deux nappes (N1) et (N2) constitué par des fibres optiques, chaque fibre étant respectivement disposée selon un segment de droite définissant deux directions (d1,d2) orthogonales délimitant un plan ou surface d'analyse. Au moins l'une des nappes (N1) est subdivisée en deux nappes élémentaires (N11, N12) espacées dans une direction perpendiculaire au plan ou surface d'analyse d'une distance (HP). Les fibres (fi11,fi12) constitutives d'une nappe élémentaire formant une nappe sont parallèles. Application à la réalisation de radiochromatogrammes à très haute résolution pour le séquençage d'ADN.
Abstract:
One general embodiment according to the present disclosure may be formation evaluation tool for detecting radiation in a borehole in a volume of an earth formation. The tool may include a detector including a monolithic scintillation element comprising a coherent assemblage of joined fibers, wherein the fibers are made of an optically transparent scintillation media. The fibers may be at least one of i) gamma ray responsive; and ii) neutron responsive. The coherent assemblage of fibers may be a continuous mass, may be heat-joined. The fibers may be solid. The scintillation media may comprise at least one of i) organic crystalline scintillation materials, ii) amorphous glass, and iii) nanostructured glass ceramics. The coherent assemblage of fibers may be asymmetric. The coherent assemblage of fibers may surround a further scintillation media having different scintillation characteristics than the scintillation media. The scintillation element may be azimuthally sensitive.
Abstract:
The invention relates to a scintillator for imaging using X-rays or gamma rays or charged particles, including a network of glass capillaries (1) with an inner diameter no greater than 500 micrometres, said capillaries being filled with a polymer material (2) made up of at least: (i) a monomer selected from the group comprising vinyltoluene, styrene and vinylxylene and the isomers thereof; (ii) a cross-linking agent made up of a dimethacrylate having a central chain which includes 1 to 12 carbon atoms; and (iii) lead dimethacrylate, the cross-linking agent being provided to make up 17 wt % to 60 wt % of the mixture thereof with the monomer, and the lead dimethacrylate being provided to make up at least 5 wt %, the cross-linking agent being provided in a ratio of 1.75 to 2.25 times the weight content of the lead dimethacrylate.
Abstract:
A fibrescope comprises a scintillator arranged to produce light of a first wavelength upon exposure to radiation; an optical system arranged to receive and direct light of the first wavelength emitted from the scintillator, the light being received at one end of the optical system, and wherein one or more elements of the optical system emits scintillation light of a second wavelength upon exposure to radiation; and an optical filter, disposed at the other end of the optical system, and arranged to transmit light of the first wavelength and block light of the second wavelength. The scintillator is chosen such that the light of the first wavelength is spectrally distinct from the light of the second wavelength.
Abstract:
The invention relates to a method for measuring a dose of radiation by a beam of high-power radiation, wherein a scintillate (1) is disposed below said beam in order to emit scintillation light whose intensity is a function of the dose of said beam irradiating said scintillate (1); the scintillate (1) is coupled to a device (8) for measuring the light emitted by the scintillate (1) via an optical fiber (2); the amount of light transmitted by the optical fiber (2) is measured; the intensity of the light emitted by the scintillate (1) is determined on the basis of the light emitted by at least one other source, after said optical fiber (2) is used for transmission of the light emitted by the scintillate (1) and the light emitted by each other source. The invention also relates to a device for measuring the dose of radiation for the implementation of said method.
Abstract:
An apparatus and method are disclosed for detecting and locating the origin of a gamma ray in a medical diagnostic imaging system. At least one primary fiber, which is a scintillating optical fiber, is positioned to receive radiation from a gamma ray source. At least one secondary fiber intersects the primary fiber at a non-zero angle and is in optical contact with the primary fiber. Both the primary and secondary fibers are provided with means for detecting light propagated in the fibers. The interaction of a gamma ray with the primary fiber will result in the propagation of light in both the primary and secondary fibers, thereby permitting the determination of the site of impact of the gamma ray in the detector, and possibly also enabling the determination of the path of incidence of the gamma ray.
Abstract:
An apparatus and method are disclosed for detecting and locating the origin of a gamma ray in a medical diagnostic imaging system. At least one primary fiber, which is a scintillating optical fiber (21) is positioned to receive radiation from a gamma ray source. At least one secondary fiber intersects the primary fiber at a non-zero angle. Both fibers have a core surrounded by a cladding (22, 23), with the claddings of the two fibers in optical contact at an intersection point (24). Both the primary and secondary fibers are provided with means for detecting light propagated in the fibers. The interaction of radiation such as a gamma ray with the primary fiber will result in the propagation of light in both the primary and secondary fibers, thereby permitting the determination of the site of impact of the gamma ray in the detector, and possibly also enabling the determination of the path of incidence of the gamma ray.
Abstract:
A new scintillating optical fiber is used in an array as a scintillator plate for imaging with high energy radiation, particles and the like. The scintillating optical fiber is an inner plastic core fiber which is transparent to visible radiation and has an index of refraction of about 1.45 or greater, and the inner plastic core fiber has a plastic cladding material which has an index of refraction less than that of the inner plastic core fiber. The inner plastic core fiber contains a polymeric matrix material; a metal moiety; and an organic fluorescent material. The scintillator plates are useful in producing high efficiency and high resolution radiographic systems for x-ray medical diagnosis or non-destructive inspection as well as non-destructive inspection with thermal neutrons. In medical x-ray applications, such as mammography, the need for lower doses of x-rays for a given image quality is met and exceeded by the higher detection efficiency of these scintillator plates and their associated electronic read-out system.