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:
A photon radiation detection systems utilizes scintillating fibers to detect downhole radioactivity along a wellbore. The system includes a light detection unit, extended light guide, and a scintillating fiber radiation detector extending along a wellbore. The scintillating fiber radiation detector may be a permanent part of the wellbore completion, or may be deployed via a downhole conveyance. The detected light photons may be utilized to evaluate the formation, cement layer or tubular string.
Abstract:
The present invention relates to a system (10) for measuring a dose of ionizing radiation received by a pre-determined part of the body during radiotherapy or interventional procedures. The system (10) comprises: a) a light guide (1), which under the influence of ionizing radiation undergoes measurable and quantifiable physical changes; b) a detector system (5) which allows the recording and quantification of the signal emitted by the light guide (1); and c) a control unit (6) which is adapted for calculating a dose of ionizing radiation previously or simultaneously received by the light guide (1) on basis of said response signal. The light guide (1) is coated over at least part of its length with a coating comprising a first component (2) acting as a place dependent spectral filter and a second component (3) including at least one luminescent material, dispersed in a transparent matrix. When exposed to radiation, the luminescent component will emit light with a spectrum depending on the chosen material. An algorithm in the control unit (6) relates the total amount of light (proportional to the dose received at each location), as recorded by the detector system (10), into a dose distribution along the coated length of the light guide (1). The invention also relates to a method for measuring a received dose of ionizing radiation using a single light guide (1) with a double component coating, along at least part of the length of the light guide (1).
Abstract:
An optical fiber(10) for detecting ionising radiation, the optical fiber(10) comprising an inorganic glass central core (11) surrounded by a cladding layer(12), wherein the cladding layer (12) comprises an organic scintillating component and the core (11) is preferably substantially non-scintillating, and wherein the refractive index of the core is greater than the refractive index of the cladding.
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 fiber optic dosimeter probe for sensing radiation dose including an optical fiber having a free end and a sensitive end, a window having a sensitive side and a rear side; a radiation sensitive layer between the sensitive end of the optical fiber and a sensitive side of the window, the radiation sensitive layer being made of a material having an optical property that changes with absorbed radiation dose, an amount of the material corresponding to a predetermined sensitivity to radiation; wherein the window and the optical fiber have a near water equivalent interaction with radiation and are MR compatible.
Abstract:
A proton computed tomography (pCT) detector system, including two tracking detectors in sequence on a first side of an object to be imaged, two tracking detectors in sequence on an opposite side of the object to be imaged, a calorimeter, and a computer cluster, wherein the tracking detectors include plastic scintillation fibers. All fibers in the detector system are read out by Silicon Photomultipliers (SiPM). A method of imaging an object by emitting protons from a source through two tracking detectors, through and around the object, and through two opposite tracking detectors, detecting energy of the protons with a calorimeter, and imaging the object.
Abstract:
A fiber optic dosimeter probe for sensing radiation dose including an optical fiber having a free end and a sensitive end, a window having a sensitive side and a rear side; a radiation sensitive layer between the sensitive end of the optical fiber and a sensitive side of the window, the radiation sensitive layer being made of a material having an optical property that changes with absorbed radiation dose, an amount of the material corresponding to a predetermined sensitivity to radiation; wherein the window and the optical fiber have a near water equivalent interaction with radiation and are MR compatible.
Abstract:
A bundle of drawn fibers that have X-ray scintillating unagglommerated nanocrystallite particles in plastic or glass cores of down to 0.1 micron spacing and claddings of X-ray absorbing compounds in the cladding composition. Optional is a cover to the bundle that blocks light from leaving the bundle at the X-ray side while allowing X-rays to pass into the cores. To image the light exiting the fiber bundle at the sub-micron level, light expansion is preferable using either a lens system or a fiber bundle expander.