54 results about "Ionizing particles" patented technology

Methods and computer readable media are disclosed for ultimately developing a dosimetry plan for a treatment volume irradiated during radiation therapy with a radiation source concentrated internally within a patient or incident from an external beam. The dosimetry plan is available in near"real-time" because of the novel geometric model construction of the treatment volume which in turn allows for rapid calculations to be performed for simulated movements of particles along particle tracks therethrough. The particles are exemplary representations of alpha, beta or gamma emissions emanating from an internal radiation source during various radiotherapies, such as brachytherapy or targeted radionuclide therapy, or they are exemplary representations of high-energy photons, electrons, protons or other ionizing particles incident on the treatment volume from an external source. In a preferred embodiment, a medical image of a treatment volume irradiated during radiotherapy having a plurality of pixels of information is obtained.

This application discloses a new, and useful computer implemented method and apparatus that can be used for the determination of SEU and SET disruptions in a cell or circuit, caused by ionizing particle strikes, including those caused by neutrons (cosmic rays), alpha particles or heavy ions. The method of the present invention includes a fast simulation tool (“TFIT”), which calculates the electrical effect of a particle's impact to a cell, or a circuit. The method is used to predict the soft error rate (SER) calculations and the FIT (number of failures-in-time) performance of designated test cell's design, depending on the type of particle environment specified. The method is designed to simulate the response of the cell or circuit to the stimuli caused by a particle strike. These stimuli are modeled as a “current source” placed between the drain and the source of each struck transistor.

A radiation shield, which may attenuate nuclear radiation or ionizing particles, may include a non-toxic, radioactivity-attenuating material based on an element or an elemental species having an atomic number of 56 or more. Examples of such materials include barium sulfate and bismuth oxide. A radiation shield may include two or more different radioactivity-attenuating materials, which may attenuate different types of nuclear radiation or ionizing particles, or attenuate different energy ranges of nuclear radiation or ionizing particles. Different radioactivity-attenuating materials may be carried by different layers of the radiation shield. Radiation shields with at least partially superimposed layers are also disclosed. Adjacent layers of such a radiation shield may be able to move longitudinally relative to one another, or slide somewhat relative to each other. Any of these features may be incorporated into a blanket, a protective suit or other protective garment, tape or any other configuration of radiation shield. Pliable radiation shields that attenuate nuclear radiation or ionizing particles are also disclosed, as are methods for limiting exposure to nuclear radiation or ionizing particles.

An ion detector includes collision surfaces for converting both positively and negatively charged ions into emitted secondary electrons. Secondary electrons may be detected using an electron detector, than may, for example include an electron multiplier. Conveniently, secondary electrons (or electrons emitted by the multiplier) may be detected using an electron pulse counter.

The memory cell comprises first and second inverter circuits, connected in a loop. First and second decoupling transistors, normally turned off outside the write phases, are respectively connected between an output of the second inverter circuit and first and second inputs of the first inverter circuit. The memory cell is thereby protected against transient disturbances due to ionizing particles. The gates of the decoupling transistors are preferably respectively connected to a supply voltage for the P-type decoupling transistors and grounded for the N-type decoupling transistors.

The invention relates to a material comprising a rare earth (Ln) silicate doped with an element B different from Ln, B being chosen among Ce, Pr, Tb, wherein B is at least partially in its 4+ oxidation state (B4+), the quantity of B4+ in said material being comprised between 0.0001 % and 0.1 % in mass. This material may be a scintillating material and may present an afterglow of generally less than 200 ppm after 100 ms relative to the intensity measured during an X-ray irradiation. It is preferably codoped. It may be obtained using an oxidizing annealing. It is particularly suited to integration in an ionizing particle detector that may be used in a medical imaging apparatus.

A method for estimating a dose gradient of the parameters of a beam of ionizing particles, the dose being deposited by the beam in a voxel of a meshed phantom of a patient, each mesh cell comprising voxels of one and the same material, the parameters of the beam comprising a fluence parameter and geometric parameters, the method comprises the determination of the analytic function for the gradient of the dose, deposited per mesh cell, of the parameters of the beam; and the determination of the estimation of the gradient of the dose in the voxel. Certain procedures for estimating the dose deposited are described. Developments deal with configurations having several independent of partially dependent irradiating beams, optimizations of the treatment plan using cost functions and the management of beams moving along trajectories. The use of servo-controlled robotic arms or of other mobile systems during irradiation is described.

The invention provides a security inspection system for inspecting persons, characterized in that it comprises: a passageway which provides an inspection space isolated or partially isolated from an ambient environment, in which at least one sub-passageway allowing persons to be inspected to pass is provided in the inspection space, and each of the sub-passageways is provided with at least one millimeter wave imaging device for millimeter wave imaging of persons being inspected; and an ion mobility spectrometer for ionizing particles of substance or gases that are released or volatilized from the inspected persons into the air in the passageway and then measuring a mobility rate thereof under the action of the electric field to effect identification of substances. At least one radioactive substance inspection device may also be provided in the passageway to detect whether the person being inspected carries radioactive substances.

A non-radioactive plasma ion source device includes at least four planar electrodes that define at least three chambers, including a discharger chamber and at least two additional chambers aligned along a major longitudinal axis of the housing. A discharger ionizes at least one of a transport gas and a discharge gas to form ions in the discharger chamber that are directed by a homogeneous electric field generated by the planar electrodes toward an analyte gas outlet. Ionized species of at least one of the transport gas and the discharge gas that are not entrained by a counterflow gas stream are discharged from the discharger chamber to form a stream of ionized particles that ionize a sample gas and thereby form a stream of ionized analyte particles of the same polarity. The ionized analyte particles are entrained with the stream of ionized particles and pass through an analyte gas outlet to an analyzer.

A device for ionizing sample particles of a sample gas flow comprises a first flow tube for providing the sample gas flow, and an introducing means for providing H₂SO₄ molecules to an interaction region. In addition the device comprises a generator for producing reagent primary ions from particles of candidate reagent gas flow essentially in a primary ion production region. The device is configured to introduce said reagent primary ions with H₂SO₄ molecules in said interaction region in order to arrange interaction between the reagent primary ions and the H₂SO₄ molecules, thereby producing HSO₄⁻ ions and again to produce HSO4⁻ ion clusters comprising HSO₄⁻ ions and at least two H₂SO₄ molecules via interactions of HSO₄⁻ with other H₂SO₄ molecules in said interaction region. Furthermore the device is configured to introduce said HSO₄⁻ ion clusters with the sample particles of the sample gas flow in order to provide reactions between said HSO₄⁻ ion clusters and the sample particles, and thereby provide a sample cluster comprising the HSO₄⁻ ion clusters and said base sample to be determined.

The invention discloses an air purification device. The air purification device comprises a shell, a high-voltage electrostatic dust removal unit and an air blower; the dust removal unit comprises an ionization unit and a dust collecting unit located at a downstream position of the ionization unit; a first gap and a first working voltage are set between the positive electrode and the negative electrode of the ionization unit, wherein the first working voltage is set to be capable of ionizing particles in air passing through the ionization unit, and the first gap is set to be not less than the insulation distance of the air and enable the ionized particles to pass through the ionization unit; and a second gap smaller than the first gap and a second working voltage smaller than the first working voltage are set between the positive electrode and the negative electrode of the dust collecting unit, wherein the second gap and the second working voltage are set to enable the ionized particles to be adsorbed on the electrodes of the dust collecting unit so as to achieve the dust removal function. According to the air purification device, the purification efficiency can be ensured, and the generation amount of ozone can be minimized. The invention further discloses an air purification method.

A neutron detector comprises a gas-filled dielectric shell, preferably a glass balloon, having opposite electrodes. An electric field is established whereby ionizing particles may be detected via ionization and current flow in the gas, using a pulse height analyzer or other conventional means. The dielectric shell preferably has low gas permeability and a bulk resistivity in the range of 10⁸ to 10¹⁷ Ω-m, and is preferably in the millimeter to centimeter size range. Multiple balloons may be arranged in parallel or may be individually addressable by the detector electronics.

A plate heat exchanger for exchanging heat between a first air stream and a second air stream includes a plurality of plates limiting first and second exchange chambers which are serially arranged in a transversal direction with respect to the plates. A first air stream of outside air passes through the first exchange chambers, a second air stream originating from ventilated rooms passes through the second exchange chambers. The heat exchanger further includes an ionization device for ionizing particles entrained in the first air stream so that the particles deposit at conductive plates of the first exchange spaces, a water distribution system for periodically discharging water into the first exchange spaces for cleaning the plates of the heat exchanger from deposited particles, and a water collection device for discharging collected water.

A detection apparatus (D) for photons or ionizing particles (P) is described, in which a detector system (11) is provided with several detecting units (11a), each including a scintillator (112) connected to a reader surface (111a) on an electronic charge reader (111), the scintillator (112) being arranged to generate cellular charges on the reader surface (111a) when capturing the photons or the ionizing particles (P), there being a collimator (113) arranged, connected to the scintillator (112) opposite the electronic charge reader (111), the collimator (113) being arranged to capture photons or ionizing particles (P′) exhibiting a direction of motion coinciding with a longitudinal axis (A) of the collimator (113), and to reject photons or ionizing particles (P′) exhibiting a direction of motion deviating from the direction of the longitudinal axis (A) of the collimator (113).

A detector for detecting the traces of ionizing particles includes a scintillator capable of emitting photons when ionizing particles pass therethrough; a first imager capable of detecting each photon emitted by the scintillator, and a first microlens array, each microlens of the first microlens array being arranged such as to produce an image of the trace of the particles by focusing the photons emitted in the scintillator on the first imager.

The invention discloses a method and device for protecting the reliability of an electronic device when ionizing particles are bombarded. The method comprises the following steps: S1, calculating theaverage free path of ionizing radiation particles with different energies acting in the electronic device; S2, according to the grade requirement of the radiation protection and the average free pathof the ionizing radiation particles, determining the size and the air pressure value of the gas device required for radiation protection of the electronic device according to the technical node size of the electronic device; S3, placing the electronic device in the gas device and filling neutral gas with preset pressure; S4, reducing the energy flow density of the incident particles by the collision of the incident particles with the neutral gas in the gas device, and protecting the electronic device from damage caused by particle bombardment. Considering that the main external factor of damaging the electronic device is the strength of the ion energy flow, the invention reduces the energy flow density of the incident particles through the arrangement of the gas device and is combined withthe reliability circuit design, thereby protecting the electronic device from the damage caused by the particle bombardment and improving the reliability thereof.