8 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.

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 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.