10 results about "High energy proton" patented technology

The invention discloses a non-interception type detector for measuring the beam position and the cross section of proton / heavy ion radiotherapy equipment, and belongs to the technical field of nuclear medicine and electronics crossing. Secondary particles (electrons or ions) obtained after ionization reaction of high-energy protons / heavy ions and residual gas molecules are used as signals, the signals are amplified to reconstruct the original position and cross section distribution of a beam, and the detector is a completely non-interception type detector and can be used as long-term online measurement equipment. According to the invention, the structure of the detector is systematically designed and optimized aiming at the position and section measurement of an extremely weak beam in proton / heavy ion radiotherapy equipment, a test is carried out on an experimental platform, a clear signal image can be obtained, the structure is compact, the performance is good, the work is stable and reliable, and the cost is low. The method is of great significance to debugging, operation and maintenance of proton / heavy ion radiotherapy equipment.

The invention discloses a GEO and SSO cross-platform satellite high-energy proton data collaborative calibration method based on a solar proton event, and the method comprises the steps: obtaining high-energy proton observation data and space environment disturbance parameter data of GEO and SSO, and carrying out the preprocessing, and obtaining high-energy proton data, satellite space-time position data and environment parameters of a unified flux type; screening high-energy proton data during the event period according to the sun proton event definition to obtain a plurality of event data sets and grouping the event data sets; performing alignment processing on the screened high-energy proton data of the GEO and the SSO; based on the power law spectrum characteristics of the solar proton event, constructing the energy matching relation of each energy channel of GEO and SSO, and determining the effective energy and energy interval of each energy channel of SSO through point-by-point spectrum fitting and statistical inversion; and recalculating the differential flux of the GEO in a corresponding energy channel by using the calibrated effective energy, establishing a point-by-point scatter matrix of the two types of satellite data, and performing linear fitting and correlation analysis to realize calibration.

The invention discloses a method for producing and preparing 67Cu through irradiation of a medium-high energy proton accelerator. Comprising the following steps: determining that a target nuclide in a radiopharmaceutical to be produced is 67Cu, and determining a composite target material which can continuously produce the target nuclide 67Cu in the whole energy range of an accelerator comprising a medium-high energy section and a low energy section, the half-life period of the target nuclide 67Cu generated after each target material of the composite target material reacts with the protons is longer than the half-life period of the impurity nuclide generated along with the target material, and the radioactive nuclear purity of the target nuclide 67Cu is required to reach 99% or above through certain irradiation time and cooling time; a composite target material with relatively high target nuclide yield and relatively low impurity nuclide yield from a high-energy section to a low-energy section is selected, and the target material not only can control the ratio of the impurity nuclide / target nuclide, but also can consider the yield of 67Cu; according to the method, the target material in the medium-high energy section is combined with the target material in the low-energy section, and the target material in the low-specific-energy section is combined with the appropriate irradiation time, so that the yield is increased.

This invention provides a Dunaliella salina mutant strain DS-HC01, which exhibits both rapid growth and high carotenoid accumulation capabilities, with the preservation number CCTCC NO: M 2026726. The mutant strain was obtained through high-energy proton beam mutagenesis at 300 MeV and a dose of 100 Gy, followed by three-stage screening. Under 25°C culture conditions, DS-HC01 overcomes the trade-off between growth and product accumulation, achieving a cell density more than 1.2 times that of the wild type on day 10, and a total carotenoid content more than 1.25 times higher. It also exhibits higher SOD activity and lower MDA content, demonstrating extremely strong antioxidant regulation capabilities and synergistic advantages in growth and pigment accumulation, making it suitable for efficient fermentation production of carotenoids.

This invention discloses a design method and detection method for a high-energy proton detection probe based on stacked cadmium zinc telluride (CZN), specifically involving the detection of protons with an energy of 100 MeV, belonging to the field of space particle measurement technology. The method steps are as follows: (1) screening the electrostatic shielding material of the stacked CZN probe; (2) calculating the number of layers and size of the stacked CZN semiconductor using the TRIM module in the SRIM software package of the Monte Carlo algorithm; (3) simulating the electrode structure and size of the stacked CZN detector using the AC / DC electrostatic module in the finite element software Comsol Multiphysics; (4) connecting each layer of the CZN detector to a preamplifier, then inputting the signal into an additive circuit for signal superposition, and then acquiring the energy spectrum through a main amplifier, multichannel, and computer. The method can detect high-energy protons with high energy resolution and accurate measurement results. The method is practical and feasible, and can serve space exploration activities.

This invention relates to a method for generating a high-purity Ac-225 radioactive beam based on an online isotope separator. A high-energy proton beam with an energy of 100 MeV is generated using a cyclotron accelerator. This high-energy proton beam is transmitted to an ISOL target chamber and bombards a thorium carbide target within the chamber, causing a nuclear reaction. Atoms produced in the nuclear reaction escape from the target and interact with a specific wavelength of incident laser light, resulting in stimulated ionization. The stimulated ionized radioactive nuclear beam is extracted by a high-voltage ion source and then transmitted via a beam transport system to a pre-analytical magnet. The radioactive nuclear beam undergoes preliminary separation by the pre-analytical magnet. After preliminary separation, the radioactive nuclear beam is further accelerated by a high-voltage accelerator tube and then further separated by the main analytical magnet to improve the purity of the beam. Compared with radiochemical separation methods, this invention offers higher separation efficiency and a shorter separation cycle, yielding Ac-225 with a purity exceeding 99%. Further purification is expected to meet the requirements of clinical trial standards.

The present invention relates to a spaceborne medium- and high-energy proton detector, which is carried on a satellite platform. The sensor module of the detector includes a cubic scintillator sensor and six silicon sensors; every two silicon sensors are set as a group and respectively arranged on three faces of the scintillator sensor; on one face of the scintillator sensor where no silicon sensor is arranged, multiple silicon photomultiplier tubes (SiPMs) are arranged; in the first silicon sensor and the second silicon sensor of each group of silicon sensors, the incident surface of the first silicon sensor is divided into an inner area and an outer area according to a set area ratio; the inner area of the first silicon sensor and the second silicon sensor are used to detect medium-energy protons and respectively generate electrical signals; the outer area of the first silicon sensor, the second silicon sensor, and the scintillator sensor are used to detect high-energy protons, wherein, the outer area of the first silicon sensor, the second silicon sensor generate electrical signals, and the scintillator sensor generates optical signals; the SiPMs are used to convert the optical signals generated by the scintillator sensor into electrical signals.

The invention discloses a LiF target preparation process based on interface diffusion anchoring, which comprises the following steps: preheating a metal substrate to 200-300 DEG C, depositing a LiF film on the surface of the substrate through a vacuum evaporation process, and carrying out in-situ annealing to obtain a LiF target with high chemical purity, high surface uniformity and high film-substrate binding force. According to the method, the substrate preheating process is introduced, the mutual diffusion capacity between LiF molecules deposited on the surface of the substrate and substrate metal atoms is improved, the vacuum evaporation process parameters of the LiF film are integrally optimized, it is ensured that the LiF molecules have enough time to be mutually dissolved and expanded with the substrate metal atoms before cooling, and crystallization rearrangement is completed; therefore, a firm diffusion anchoring interface structure is formed, and the film-substrate binding force is remarkably enhanced. By introducing an in-situ annealing process, thermal stress generated due to mismatch of thermal expansion coefficients between the LiF film layer and the substrate is released, and it is ensured that the film layer of the LiF target is not prone to falling off under high-energy proton bombardment.

The invention discloses a satellite in-orbit high-energy proton radiation environment data processing and modeling method, and relates to the field of satellite and spacecraft space radiation environment detection.The satellite in-orbit high-energy proton radiation environment data processing and modeling method comprises the steps that proton flux data observed and detected by a satellite in orbit is selected as original data, and data is screened out from the original data; a DBSCAN clustering algorithm is adopted for the screened data, a plurality of space accumulation areas are obtained, an area with the most data is selected from the space accumulation areas, and the area is a high-energy proton radiation core accumulation area; a sparsification method is adopted for the high-energy proton radiation core accumulation area, and a data point set after sparsification processing is obtained; the data point set and the space coordinate points of other areas are collected and stored, 2D and 3D models of high-energy proton radiation distribution are generated and drawn, and the 2D and 3D models are used for displaying high-energy proton space distribution. According to the method, the efficiency and precision of the model are remarkably improved, and the accuracy of reliability evaluation and performance prediction of the satellite in a complex radiation environment is improved.

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.