Abstract:
The invention relates to a detecting unit for detecting ionizing radiation. The device comprises a converter unit for the amplification of ionizing radiation and a read-out unit, wherein the converter unit comprises a converter and a gas-electron multiplier (45), wherein said converter comprises a substrate (51) with an ionizing radiation- receiving major surface (63) and an electron-emitting major surface (65) and a stack (53) of accelerator plates (55) in contact with the electron-emitting major surface (65), wherein said stack comprises a plurality of perforated accelerator plates wherein the perforations (57) of the perforated accelerator plates are aligned to form a matrix of blind holes (61).
Abstract:
The present invention relates to a detector (22') for detecting ionizing radiation,comprising: a directly converting semiconductor layer (36) for producing charge carriers in response to incident ionizing radiation; and a plurality of electrodes (34) corresponding to pixels for registering the charge carriers and generate a signal corresponding to registered charge carriers; wherein an electrode of the plurality of electrodes (34) is structured to two-dimensionally intertwine with at least two adjacent electrodes to register the charge carriers by said electrode and by at least one adjacent electrode. The present invention further relates to a detection method and to an imaging apparatus.
Abstract:
The present invention relates to a dosimeter system for determining radiation exposure comprising a first unit 100 a second unit 200, wherein the first unit 100 comprises first detecting means 110 configured for determining a first quantity indicative of an influence of a first radiation field, and transmitting means 140 for transmitting the first quantity determined by the first detecting means 110 to the second unit 200, wherein the second unit 200 comprises second detecting means 210 configured for determining a second quantity indicative of an influence of a second radiation field on biological tissue, third detecting means 260 configured for determining a third quantity indicative of an influence of the second radiation field, wherein the third detecting means is of the same type as the first detecting means 110 comprised by the first unit 100, and means for determining a quantity for adjusting the first quantity on the basis of the second quantity determined by the second detecting means 210 and the third quantity determined by the third detecting means 260, wherein the quantity for adjusting the first quantity is determined such that a fourth quantity indicative of an influence of the first radiation field on biological tissue can be determined on the basis of the first quantity determined by the first detecting means 110 and the quantity for adjusting the first quantity. The biological tissue may be human tissue. The quantity for adjusting the first quantity may be determined in real time.
Abstract:
Certain aspects pertain to aperture-scanning Fourier ptychographic imaging devices comprising an aperture scanner that can generate an aperture at different locations at an intermediate plane of an optical arrangement, and a detector that can acquire lower resolution intensity images for different aperture locations, and wherein a higher resolution complex image may be constructed by iteratively updating regions in Fourier space with the acquired lower resolution images.
Abstract:
A radiation detector includes a housing to contain a radiation detecting gas. The housing has a first thermal expansion over an operating temperature range. An elongate electrode extends within the housing and has opposing first and second ends, with the first end secured to adjacent portion of the housing. The elongate electrode has second thermal expansion over the operating temperature range defining a difference with respect to the first thermal expansion. A temperature compensator is coupled between the second end of the elongate electrode and an adjacent portion of the housing. The temperature compensator has a third thermal expansion over the operating temperature range to maintain a tension on the elongate electrode within a desired range over the operating temperature range.
Abstract:
A radiation detection assembly includes an ionization chamber for detecting radiation. The ionization chamber includes a volume of pressurized gas. An exterior enclosure houses the ionization chamber within an interior volume. The exterior enclosure includes a frangible section. A relief assembly defines a gas flow path from the ionization chamber to the frangible section of the exterior enclosure. The frangible section releases pressure from within the ionization chamber when the pressurized gas within the ionization chamber exceeds a predetermined pressure such that at least some of the pressurized gas flows through the relief assembly and through the frangible section of the exterior enclosure. The pressurized gas is then released to an exterior of the exterior enclosure. A method of reducing pressure within a radiation detection assembly is also provided.
Abstract:
The invention provides a charged particle sensor (10) for detecting and measuring ionic current generated by charged particles resulting from ionisation processes, comprising: a housing (16), a detection electrode (14) enclosed within the housing for collecting the charged particles, and an electrometer (12) having an input connected to the detection electrode for receiving a DC input signal therefrom and an output (18) for supplying a DC measurement signal as output. The housing comprises an electrostatic screen (16) for screening the detection electrode from external electric fields, whereby to reduce the sensitivity of the detection electrode to such fields. The electrostatic screen includes an electrically conducting screening sheet (26) provided as a second electrode facing the detection electrode and formed with interstices to allow the entry of radiation into the housing, and the second electrode and the detection electrode are arranged to be maintained in use at a bias voltage with respect to one another so as to effect charge separation amongst charged particles resulting from ionisation processes and thereby produce an ionic current impinging on the detection electrode.
Abstract:
An energy-sensitive imaging detector for fast-neutrons includes: a) a series of energy-selective stacks (4 to 14 to 18) of radiator foils (6) which converts neutrons (n) into recoil protons (p, pi to p3); said foils (6) are separated by gas- filled gaps (13) and are made of two layers fastened together: a hydrogen-rich layer, such as a polyethylene layer (10) for neutron-to-proton conversion, and a metal foil layer, such as an aluminum layer, defining a proton energy cut-off and limiting angle of proton emission; b) surrounding gas in the gas-filled gaps (13) in which energetic recoil protons emerging from the radiator foil release electrons; c) an electric field (Edrlft) able to efficiently drift the electrons (20) through the gas-filled gaps (13); and d) an electron detector with a position sensitive readout (PSRO), based on Micro-Pattern Gaseous Detector (MPGD) technologies (like e.g. the THick Gaseous Electron Multipliers - THGEM) or other means of electron amplification in gas; the charge detector is equipped with a dedicated imaging data- acquisition system, which detect the drifted electrons thereby sensing the position of the original impinging neutrons.
Abstract:
En la presente invención se describe un método y aparado para medir distribuciones de LET y Energía de haces de hadrones o iones. El método y aparato objetos de la presenten invención están basados en cámaras de ionización, herramientas habitualmente usadas en la dosimetría de radioterapia. La invención se dirige a las técnicas de verificación dosimétrica de los haces de terapia de hadrones o iones.