Abstract:
An apparatus for detecting radiation comprises a radiation converter (101), a photodetector (102), and a light guide (103) for conducting photons emitted by the radiation converter. The radiation converter is a layer in contact with a first surface (105) of the light guide and the photodetector is attached to an opposite side of the light guide. A convex second surface (106) of the light guide receives the photons from the radiation converter and has a reflective coating (104) reflecting the photons backwards to the radiation converter that, in turn, reflects the photons to the photodetector. As the photons are reflected back-and-forth in the above-mentioned way, the photons can be directed to a small area even if the light guide is short in a direction (z) perpendicular to the first surface of the light guide.
Abstract:
Boron nitride nanotubes (BNNTs) with 10B combined with a scintillation gas can serve as the basis for detecting thermal neutrons by detecting light from the decay products of the thermal neutron's absorption on the 10B atoms in the BNNT Material as the resultant decay products pass through the scintillating gas. BNNTs with 11B can be utilized as a scaffold for 238U and combined with a scintillation gas as the basis for detecting fast neutrons via detecting light from the fission decay products passing through the scintillating gas. Both technologies provide high spatial and temporal resolution for the detection of thermal neutrons and fast neutrons respectively.
Abstract:
The disclosure relates to lanthanum-yttrium oxide scintillators used for detecting radiation, such as X-rays, gamma rays and thermal neutron radiation and charged particles, security, medical imaging, particle physics and other applications.
Abstract:
The invention relates to charged-particle segmented strip detectors, in which the strips comprise one or more scintillating fibers and the fibers are arranged in the form of a strip and are folded onto themselves so as to form a loop with a bending radius which is 0 or parallel and spaced in the case where alpha = 0. These detectors may be one-dimensional or two-dimensional position detectors or tracking detectors and may be combined with residual range detectors. The invention also relates to compression of the number of read-out channels of these detectors obtained by means of suitable grouping of the fibers at the two read-out ends thereof, obtaining a compression factor equal to 2·√N, where N = the number of read-out channels of the fibers, in quadruple coincidence. The detectors according to the invention are applicable to apparatus for radiography or tomography using charged particles.
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.
Abstract:
Apparatus for capturing two-dimensional images created by radioactive emanations, such as gamma rays, from a radioactive source, comprises a collimator (14), a two-dimensional array of scintillating fibers (23) and position encoding apparatus (18). The scintillating fibers are located at preselected x and y positions in an x-y plane. The position encoding apparatus comprises banks of photon detectors (28, 30) and a network of optical fibers (26) which are connected to the photon detectors in a manner which encodes the x-y coordinates of the scintillating fibers, and a signal processor for generating position signals indicative of the encoded position of an active scintillating fiber.
Abstract:
The invention concerns a device for measuring exposure of a solid state image sensor (1). Said detector (1) comprises a first surface (1a) exposed to an ionising radiation (R1) representing the image. It releases through another surface (1b) opposite the first (1a) an unabsorbed ionising radiation (R2). The measuring device is designed to be placed near the other surface and to be exposed to the unabsorbed ionising radiation (R2). It comprises at least one optical fibre (11) emitting a visible or nearly visible radiation, obtained by conversion in the optical fibre, towards at least a sensing device (13), the visible or nearly visible radiation representing the unabsorbed ionising radiation. The sensing device (13) generates a signal representing the image sensor exposure. The invention is in particular applicable to X-ray image sensors.
Abstract:
Boron nitride nanotubes (BNNTs) having a second scintillating material, and in some embodiments an enhanced 10B content, may be used for efficient thermal neutron detection. The second scintillating material may be a crystal coating on the nanotubes, and/or crystal dispersed within the BNNT material. Crystal-coated BNNT materials enable detecting thermal neutrons by detecting light from the decay products of the thermal neutron's absorption on the 10B atoms in the BNNT material, as the resultant decay products pass through the crystal-coating. Embodiments of thermal neutron detectors are described. Methods for preparing BNNTs with a second scintillating material are also described.
Abstract:
A ionizing radiation detector comprising a plurality of scintillators (12) of plastic material, wherein said scintillators (12) are in form of co-planar plates disposed according to a two-dimensional ordered arrangement, each plate having a respective optical fiber (13) joined to a face or to a perimetral edge portion of the plate for conveying scintillation light pulses to a photodetector (20).
Abstract:
A fiber-optic scintillator radiation detector includes a multitude of optical fibers that each include an optical core. The optical cores are spaced apart from one another by an interposer material. In various embodiments, the interposer material has an average atomic number less than 13 and a density greater than 1.3 g/cm 3 .