52 results about "Radiation Interaction" patented technology

An assembly for detecting radiation is described. The assembly includes a host matrix with particles suspended within the host matrix. The particles are capable of generating a charge carrier upon interaction with the radiation. A first electrode is disposed adjacent to a first surface of the host matrix, and a second electrode disposed adjacent to a second surface of the host matrix. A power source operatively connects to one of the first or second electrodes. The power source establishes an electric field between the first and second electrodes such that a ratio of a mobility-lifetime-field strength product of the charge carrier to the thickness of the host matrix is greater than or equal to 0.1. A radiation detector and a method for detecting radiation are also described.

An integrated radiation detector having a pulse-mode operating photosensor optically coupled to a gamma sensing element and a neutron sensing element is disclosed. The detector includes pulse shape and processing electronics package that uses an analog to digital converter (ADC) and a charge to digital converter (QDC) to determine scintillation decay times and classify radiation interactions by radiation type. The pulse shape and processing electronics package determines a maximum gamma energy from the spectrum associated with gamma rays detected by the gamma sensing element to adaptively select a gamma threshold for the neutron sensing element. A light pulse attributed to the neutron sensing element is a valid neutron event when the amplitude of the light pulse is above the gamma threshold.

A method and apparatus for reading in a three-dimensional information carrier are presented. The three-dimensional information carrier is formed with a plurality of spaced-apart data regions, each surrounded by surrounding-regions. The data regions are made of a material capable of generating an output excited radiation, when interacting with a predetermined incident exciting radiation, while the surrounding regions are substantially optically transparent. The apparatus comprises an illumination unit, a light directing unit and a detector unit. The illumination unit produces a scanning beam of the incident radiation. The light directing unit projects the incident radiation onto a scan region located in an addressed plane inside the carrier and collects the output radiation. The light directing unit is capable of picking up a predetermined portion of the collected output radiation, so as to provide spatial separation of the output radiation components produced by the data regions located in the addressed plane and the output radiation components produced by the data regions located at any other location inside the carrier.

A radiation counting detector includes a first substrate and a second substrate that is generally parallel to first substrate and forms a gap with the first substrate. A gas is contained within the gap. A photocathode layer is coupled to one side of the first substrate and faces the second substrate. A first electrode is coupled to the second substrate and a second electrode is electrically coupled to the first electrode. A first impedance is coupled to the first electrode and a second impedance is coupled to the second electrode. A power supply is coupled to at least one of the electrodes. A first discharge event detector is coupled to the first impedance and a second discharge event detector is coupled to the second impedance. The radiation counting detector further includes a plurality of pixels, each capable of outputting a gas discharge pulse upon interaction with radiation received from the photocathode. Each gas discharge pulse is counted as having an approximately equal value. The radiation counting detector further includes circuitry for detecting if a gas discharge pulse is output from the pixels, and for counting each gas discharge pulse as an individual event.

A radiation therapy method that includes directing a beam along a beam path toward a treatment area. Performing a correction process on the beam, the process includes selectively collimating the beam based on a dose that takes into account bremsstrahlung interactions caused by the beam.

Detector of radiation using a composite material and process for manufacturing this detector. This detector comprises layers (6) of a semiconducting composite material comprising a host matrix made of a polymer and semiconducting-type guest particles dispersed through the host matrix, means (22-26) for creating an electric field in these layers and a stack of sheets (4) of a first material emitting particles by interaction with the radiation, the layers alternating with the sheets, each of the layers being associated with one of the sheets, the stack having opposite faces, each containing the edges of the sheets and layers, the means of creation of the field, comprising, for each layer, a group of parallel and conductive tracks (22) which extend from one face to the other, parallel to this layer, and which are in contact with it.

The invention relates to a multi-layered radiation converter, a radiation detector comprising such a converter as well as a radiation-based imaging system using such a detector. Each converter layer (32) in the radiation converter is adapted for interaction with incident radiation to cause the emission of electrons into drift holes defined in the converter layer. The drift holes of one converter layer (32-1) are staggered with respect to the drift holes of another converter layer (32-2). By mutually shifting the converter layers such that the drift holes of two different layers are no longer well-aligned, but rather staggered with respect to each other, the effective conversion area will be increased, and the probability of incoming radiation passing through the stack without interaction with the converter layers will be significantly reduced. In this way, high absorption efficiency for incident radiation inside the multi-layered converter structure is ensured, while still maintaining transparency for emitted electrons through the drift holes.