13 results about "Dosimetry radiation" patented technology

The invention relates to the technical field of radioactive injury effect research, in particular to a radioactive eye injury model establishment method which comprises the following specific steps: S1, setting a plurality of experimental groups; the experimental group at least comprises a model group receiving different doses of ionizing radiation irradiation and a control group not receiving effective dose of radiation irradiation; s2, selecting an experimental animal, shaving and cleaning the target eye area of the animal needing to be irradiated, and anesthetizing the animal; s3, generating ionizing radiation of a preset type and energy by using a radioactive source, and performing local irradiation on the animal eye target area according to the preset total irradiation dose of each model group; s4, after irradiation is completed, the animals are nursed; the reaction of the animal after irradiation is observed, and scoring is carried out. The effectiveness of the established radioactive eye injury model can simulate typical expressions of eye injury under radiation irradiation of different doses, and a reliable animal model is provided for follow-up research of the generation mechanism of radioactive eye injury and evaluation of prevention and treatment measures.

A method of producing pollen that reduces fitness of at least one weed species of interest is provided. The method comprises treating the pollen of plants of a weed species of interest with an irradiation regimen selected from the group consisting of:(i) X-ray radiation at an irradiation dose of 10-1600 Gy;(ii) gamma radiation at an irradiation dose of 10-2000 Gy;(iii) particle radiation; and(iv) UV-C radiation at an irradiation dose of 100 μJ / cm2-50 J / cm2, with the proviso that when said weed is A. palmeri, when said irradiation is X-ray, the irradiation dose is not 300 Gy and wherein when said irradiation is gamma irradiation the irradiation dose is not 100, 300 and 500 Gy, and wherein when said radiation is UV-C the dose radiation is not 2 J / cm2.

The invention relates to the field of radiation field material detection, in particular to a high-radiation area metal material field material detection device and a high-radiation area metal material field material detection method.The device comprises a wireless movable detection device, a polishing mechanical arm, a steel wire polishing ball, a mechanical arm and an X-ray fluorescence spectrum integrated detection device; the wireless movable detection device can freely move on the ground and is connected with one end of the polishing mechanical arm and one end of the mechanical arm, a steel wire polishing ball is arranged at the other end of the polishing mechanical arm, and the X-ray fluorescence spectrum integrated detection device is arranged at the other end of the mechanical arm. According to the method, the steel wire grinding ball is arranged to achieve grinding and rust removal of the metal part to be detected, the X-ray fluorescence spectrum integrated detection device is arranged to achieve the chemical component detection function, detection work is completed on the premise that a detector does not enter a high-dose radiation control area, and the risk that the detector bears high-dose radiation and is contaminated is avoided.

The present invention discloses a self-annealing chip and a self-annealing system. The self-annealing chip includes a control module and a heating module. The control module includes a PMOS total dose radiation probe. Among them, the threshold voltage of the PMOS total dose radiation probe decreases when it is exposed to external radiation. The control module is used to receive a reference voltage, and output a first control signal to control the heating module to generate heat when the threshold voltage decreases to be less than or equal to the reference voltage; during the heating process, the threshold voltage is restored after annealing; the control module is also used to output a second control signal to control the heating module to stop generating heat when the threshold voltage is restored to be greater than the reference voltage. The self-annealing chip has good anti-total dose radiation ability, and can automatically start / stop the thermal annealing treatment function according to the drift of the threshold voltage of the PMOS total dose radiation probe, effectively ensuring the real-time performance and accuracy of the thermal annealing treatment of the self-annealing chip and the chip to be protected.

The invention relates to a method for rapidly identifying total dose radiation damage of dynamic characteristics of a silicon carbide power transistor. A device involved in the method is composed of an electrostatic test platform, a sample driving board, a driving power supply, a pulse generator, a high-voltage power supply, an oscilloscope and a computer. A drain-source voltage, a drain-source current, a gate-source voltage and a gate voltage of the silicon carbide power transistor are accurately and rapidly measured by using a high-voltage probe on an oscilloscope, and a characteristic curve of the gate-source voltage, the drain-source voltage and gate charges is obtained through calculation. And extracting threshold gate-source charges, gate-source charges, gate-drain charges, gate total charges and Miller voltage of the device according to the IEC60747-9 standard. And comparing gate charge values of the device before and after irradiation, and if degradation is greater than a set pre-value, judging that the dynamic characteristics of the device are subjected to radiation damage. The method is easy and convenient to operate and has certain universality.

To provide a radiographic imaging device, a transfer method, a program, and a radiographic imaging system capable of suppressing delay in display of radiographic images on display media due to transfer time.SOLUTION: A radiographic imaging apparatus is capable of capturing a first radiographic image by irradiation with a first dose of radiation and a second radiographic image captured by irradiation with a second dose of radiation higher than the first dose of radiation in a case in which a subject enters a predetermined state and comprises a transmission processing unit that transmits the second radiographic image between the first radiographic image and the second radiographic image to a display medium on the basis of predetermined information.SELECTED DRAWING: Figure 4

The utility model discloses a novel portable dose radiation monitoring device which comprises a shell, an ultraviolet light LED array module, an interference filter, a phosphate glass radiation detection chip, a medium long-wave-pass filter, an attenuation piece support and an attenuation piece. The ultraviolet LED array module, the interference filter, the phosphate glass radiation detection chip, the medium long-wave-pass filter and the attenuation piece support are sequentially installed in the shell, and four holes are formed in the attenuation piece. According to the utility model, radiation dose reading is realized through screening of attenuation slices with different transmittance and big data analysis of fluorescence pictures, and the device has the advantages of simple optical structure, low material cost, miniaturization, portability and the like.

The invention discloses a movable radiation protection device with a multilayer isolation protection structure, and relates to the technical field of medical radioactive protection equipments.The movable radiation protection device is characterized in that a rack is fixedly arranged on a base, a moving assembly is arranged on the rack, the number of bearing assemblies is two, one bearing assembly is arranged on the moving assembly, and the other bearing assembly is arranged on the base; the side frame is stacked in the bearing assembly, and the protective insertion plate is embedded and fixed in the side frame; according to the characteristics that optimal protection materials of different radiation sources are different and protection structures of radiation sources with different doses are different in thickness, a structure with a storage characteristic and a moving characteristic is adopted, so that a single-piece protection plate can be prefabricated, and the specific protection plate is adopted according to the difference of the radiation sources needing to be protected; and different numbers of protection plates can be inserted according to protection grades, so that the radiation protection equipment which can adaptively adjust a protection structure and can move along with the protection structure is formed.

The present application belongs to the technical field of label printing or radiation sterilization, and particularly relates to a label with radiation color change indication and radiation dose detection, a preparation method thereof, and a radiation dose detection method. The preparation method of the label comprises the following steps: mixing thymol blue, alcohol, alcohol-soluble acrylic resin, a buffer solution, chloral hydrate, and a leveling agent to obtain composite ink; performing positioning and quantitative inkjet printing of the composite ink on the surface of an adhesive label, and drying to form an ink layer, thereby obtaining the label with radiation color change indication and radiation dose detection. The label can indicate whether the goods have undergone a sufficient dose of radiation according to the color change after radiation, and the size of the radiation dose can be obtained according to a radiation dose standard color chart. The label has good color consistency before and after undergoing the same dose of radiation, and the obtained radiation dose result is accurate and reliable.

This present disclosure provides a multilayer dosimetry system, comprising: (a) a mounting layer, wherein the mounting layer is an optically clear polymer film having two sides coated with an optically clear first adhesive; (b) at least two active layers, wherein the mounting layer is sandwiched between active layers by affixing to the optically clear first adhesive; and (c) (i) an optically clear top base layer affixed to upper side of the sandwiched structure of (b), and (ii) a bottom base layer affixed to bottom side of the sandwiched structure of (b). The present disclosure also provides a point dose measurement device comprising a multilayer dosimetry system. The present disclosure further provides an integrated system to measure point dose radiation and a process for measuring point dose radiation.

This invention proposes a capsule to administer radiation to a patient to be mounted on an arm, preferably a robotic arm such as on and in coordination with a Da Vinci® Surgical Robot, in order to control radiation exposure using a cylindrical shell shutter system designed to minimize leakage from a centrally located radiation source, while permitting full exposure of irradiated subject material or space when the cylindrical shell shutter system is opened. Using a series of concentric cylindrical shells which each contain an offset conically-shaped aperture from that of an adjacent cylindrical shell, when the cylindrical shells rotate into an “open” position, the apertures form a smooth cone to an outer emission aperture and expose the radiation source to adjacent tissue. When rotated to be “closed” or “off, the offset apertures and shells occlude the source, preventing full-strength radiation exposure and minimizing radiation leakage.

The invention relates to a bipolar transistor total dose radiation damage prediction method based on an artificial neural network. A device adopted by the method comprises a cobalt-60 radioactive source, an irradiation experiment platform, a bipolar transistor sample irradiation plate, a bipolar transistor sample, a BC3193 discrete semiconductor device testing system, a triode testing seat and a computer display. By collecting electrical parameters of multiple batches of samples of multiple manufacturers in conventional and high-load states and combining radiation experiment data, a training set containing relative difference characteristics and composite characteristics is constructed. And establishing a neural network model comprising a feature processing layer, a feature fusion layer and a prediction output layer, monitoring a training process by adopting a verification set to prevent overfitting, and evaluating the generalization ability of the model through the test set. Confidence interval estimation is established based on error analysis, the current amplification coefficient degradation conditions of four dosage points of 25, 50, 75 and 100 kaillard can be accurately predicted, and an effective means is provided for transistor reliability evaluation in a radiation environment.

This invention relates to a method for constructing a total dose radiation effect model for a FinFET, comprising the steps of constructing a FinFET with total dose radiation effect, constructing a parasitic transistor channel current equation, conducting a FinFET total dose radiation effect experiment, and extracting model parameters. The theoretical basis of this invention is that the total dose radiation effect generates oxide trap charges within the isolation oxide of the FinFET, reducing the parasitic transistor threshold and causing it to conduct prematurely, leading to an increase in the FinFET subthreshold current. Based on the physical mechanism of radiation damage, this invention proposes a parameter degradation equation. The parameters in the degradation equation have clear physical meanings, and the parameter adjustment range in model fitting is clear, making the model more convergent and achieving higher accuracy.