6 results about "Proton radiation" patented technology

The present disclosure provides a method for calculating a proton radiation dose in a magnetic field, comprising: determining a position of an exit source and a velocity and energy of a pencil beam at the exit source; upon a proton beam being emitted from the exit source, determining, in chronological order, a plurality of candidate boxes according to the position of the exit source, the velocity and energy of the pencil beam at the exit source, and information of the magnetic field, and sequentially calculating a position of an intersection point between the pencil beam and a surface of each candidate box, and the velocity and energy of the pencil beam at each intersection point; among the candidate boxes inside a phantom, selecting a plurality of intersection points as sampling points, and connecting all the sampling points to obtain an actual motion trajectory of the pencil beam in the phantom; and according to the actual motion trajectory and a pencil beam algorithm, obtaining a proton dose delivered by the pencil beam to any voxel in the phantom, and then obtaining a proton dose delivered by proton irradiation to any voxel in the phantom.

Proton therapy system (1) for treating a patient (2) by means of proton radiation (3), comprising a particle accelerator (4) for generating a proton beam, a movable patient table (5) for holding and positioning a patient (2), a beam guidance device comprising several electromagnets (6) for focusing and / or defocusing and / or deflecting the proton beam (3), and a gantry (7) rotatable about a horizontal axis of rotation (R) for directing the proton beam (3) onto a target volume within a patient (2) held on the patient table (5), wherein the proton beam (3) has a maximum energy of less than 180 MeV, and the beam guidance device comprising a first scanner magnet (8A) and a second scanner magnet (8B) arranged in the direction of the proton beam behind the first scanner magnet (8A) for deflecting the proton beam (3), as well as a Proton beam direction between the scanner magnets (8A,8B) has a deflection magnet (9) arranged, wherein the deflection magnet (9) is configured to focus the proton beam (3) at the magnet input (9.1) in the plane of the beam deflection by the first scanner magnet (8A).

The invention relates to a tissue marker for proton radiation heart injury and application of the tissue marker. The tissue marker comprises one or more of a transcription marker and a protein marker. Wherein the transcription marker comprises one or more of PIK3R5, CCR7, IL7R, CD7, CD22, CR2, CCL5 and VAV1, and the transcription marker comprises one or more of PIK3R5, CCR7, IL7R, CD7, CD22, CR2, CCL5 and VAV1; and the protein marker comprises one or more of SIRT1 and HMGB1 (High Mobility Group Box 1). According to the invention, the differential marker is used as a potential biomarker of the radioactive heart loss, and a research method for researching the radioactive heart loss by using a mouse model is provided, so that a demonstrative research is provided for multi-omics analysis of the radioactive heart loss and explanation of an action mechanism of the radioactive heart loss.

This invention relates to a back-contact crystalline silicon solar cell for space applications and its fabrication method. The back-contact crystalline silicon solar cell comprises a p-type monocrystalline silicon substrate; the first crystalline silicon surface of the p-type monocrystalline silicon substrate is the light-facing side, and is sequentially disposed with a surface passivation layer, a first radiation-resistant layer with a silane-like structure, and a radiation-resistant hardening layer; the second crystalline silicon surface of the p-type monocrystalline silicon substrate is the back-facing side, and is sequentially disposed with a first intrinsic amorphous silicon passivation layer, a second radiation-resistant layer with a silane-like structure, a second intrinsic amorphous silicon passivation layer, a periodically spaced p-type hole collection layer and an n-type electron collection layer, a patterned transparent conductive oxide film, and a metal electrode. The back-contact crystalline silicon solar cell of this invention exhibits strong tolerance to extreme space environments, including resistance to ultraviolet radiation, high-energy electron and proton radiation, and high- and low-temperature cycling shock, and can provide low-cost, high-reliability solar cells for the energy systems of spacecraft, low-orbit communication satellites, and space stations.

The invention discloses a method for evaluating high-energy proton irradiation damage of a back gate CNT (carbon nano-tube) device, and the method comprises the steps: introducing a charge deposition layer, namely a CNT / charge deposition layer / SiO2 / P-Si structure, which is used for generating a capturing effect of an interface trap through reaction proton irradiation into a device structure; accurate estimation and evaluation of high-energy proton radiation damage and output characteristic influence of the back gate CNT device are realized. The specific process of damage evaluation is as follows: 1, constructing a back gate CNT device simulation model containing a charge deposition layer; 2, electrical parameters of a charge deposition layer and other components in the model are adjusted, and output characteristics of the device are accurately simulated; 3, simulating the influence of proton irradiation on electrical parameters of the charge deposition layer and other components; and 4, substituting the electrical characteristics of the irradiated charge deposition layer and other components into the device simulation model in the process 1, simulating the output characteristics of the device, and evaluating the damage of the high-energy proton irradiation to the back gate CNT device and the influence of the high-energy proton irradiation on the output performance of the back gate CNT device. According to the damage assessment method, the charge deposition layer is introduced to reflect the capture effect of an interface trap generated by proton irradiation, a simulation result is matched with an experimental result, accurate prediction of irradiation damage of the back gate CNT device is achieved, and understanding of a micro-level damage mechanism is deepened.

The invention relates to a method for acquiring images formed using proton radiation. The essence of the invention consists in performing a preliminary check to establish a match between the parameters of the proton beam generated by a first magneto-optical system and the parameters of a second magneto-optical system, which requires: removing a converter from the first recording system and installing a detector of proton radiation in the Fourier plane of the second magneto-optical system instead of a collimator, where the converter and the collimator are returned to their previous positions before the start of the check; changing the angle of inclination of the phase ellipse of the proton beam generated by the first magneto-optical system in the vertical and horizontal planes while passing the beam through the examination zone and through the second magneto-optical system; recording signals from the detector installed in the Fourier plane; and determining the size of the beam in both planes, where the parameters of the proton beam are parameters matched to the parameters of the second magneto-optical system when the size of the beam is minimal, and the examination is performed using the beam with matched parameters. The quality of the recorded proton images is thus improved.