14 results about "Radiation Interaction" patented technology

The invention belongs to the technical field of semiconductor detectors, and particularly relates to a whole process simulation method and system for response of a semiconductor nuclear radiation detector. According to the method, through cooperative operation of a detector working parameter setting module, a carrier transport simulation module and a detection system electronics response module, whole-process response prediction of the semiconductor detector from radiation interaction to electronics output can be realized under different carrier transport characteristics and device structure conditions; according to the method, the carrier drift process is simulated in a small-step iteration mode, accurate reconstruction of a carrier drift track can be synchronously achieved, CSA signals and main amplifier forming signals can be continuously generated in real time, simulation output of an energy spectrum is finally completed, and therefore core performance indexes of a detector are comprehensively reflected. The method is wide in applicable semiconductor material range and device structure, the main amplifier module type can be flexibly configured, the overall simulation process is simple, convenient and efficient, and the method has good universality and engineering application value.

The present invention relates to a real-time dosimetry device for neutron capture treatments. The device comprises a first module (1) to absorb a flow of dispersed neutrons in a patient which impinge on the device. The first module (1) is made of a lightweight material such as high-density polyethylene, graphite, or a molecular compound, with lithium content. A second module comprises a first segmented gamma radiation detector (2) that is sensitive to radiation interaction positions therein, and a second segmented gamma radiation detector (3), which is also sensitive to the positions, the second gamma radiation detector (3) being detachably coupled to the first gamma radiation detector (2). The device is particularly suitable for real-time dosage monitoring in patients during boron neutron capture treatments (BNCT).

The invention relates to the technical field of radiation cultivation and discloses a directional radiation cultivation method which comprises the following steps: placing a first target plant enriched with preset elements in a radiation environment with preset flux for radiation to obtain a mutated second target plant, the preset element is enriched at a target position of the first target plant, and the preset element can generate a nuclear reaction for generating charged particles in cells in the first target plant under the radiation effect. According to the directional radiation breeding method, the technical problem of how to realize directional radiation breeding under low-flux radiation can be solved, and the intracellular radiation level of the sample plant can be improved under the same radiation dose by utilizing the interaction of the preset element in the cells of the first target and radiation; and meanwhile, the dose at the target position is higher than that at other positions, so that the probability of mutation at the target position is increased, and the effect of directional mutation is achieved.

To provide a radiation detector capable of improving time resolution for detecting the interaction time of radiation in a scintillator.SOLUTION: A radiation detector 10 comprises a scintillator 11, a photodetector 12, and a processing section 13. The processing section 13 includes a signal waveform acquisition section 14, a deconvolution computation section 15, and an interaction time detection section 16. The signal waveform acquisition section 14 acquires a waveform f(t) of an electric signal output from the photodetector 12. The deconvolution computation section 15 performs deconvolution computation on the electric signal waveform f(t) acquired by the signal waveform acquisition section 14 with an impulse response function i(t) of the photodetector 12. The interaction time detection section 16 detects, as the interaction time, the time when the waveform obtained by the computation of the deconvolution computation section 15 reaches a threshold.SELECTED DRAWING: Figure 1

In some embodiments, a method of screening drug-radiation interactions includes determining a drug panel having a plurality of drugs to analyze; obtaining a cell line panel having one or more molecular parameters of interest and a plurality of cell lines; obtaining a cell line density and intrinsic radiotherapy response for each cell line in the cell line panel; determining a subset of drugs of the drug panel; determining initial radiation-dose-drug-concentration (RDDC) combinations for use with the subset of drugs of the drug panel; determining full concentration-response relationships for the cell lines of the cell line panel using the initial RDDC combinations; determining an RDDC combination subset from the initial RDDC combinations based on the full concentration-response relationships; and screening the cell lines of the cell line panel using the RDDC combination subset for each drug within the drug panel. Numerous other embodiments are provided.

Disclosed is a wavefront sensor for measuring a wavefront of a radiation. The wavefront sensor comprises a mask comprising a pattern located in path of the radiation to interact with the radiation. The radiation impinging on the mask forms a radiation detection pattern on a radiation detector subsequent to the mask, and the pattern of the mask is designed at least partly based on a requirement of the radiation detection pattern.

The application discloses a kind of based on three-dimensional form constraint's thermal exposure field identification method, device and medium, the method includes the pre-processing of target city's multi-source basic data, according to the grid unit corresponding to the target city of processed multi-source basic data is constructed;According to the digital surface model of fusion topography, building and vegetation, the sky view factor of pedestrian height and three-dimensional shelter angle are calculated per pixel, to construct three-dimensional radiation geometric relationship;According to grid unit and three-dimensional radiation geometric relationship generates three-dimensional city form constraint field;According to three-dimensional city form constraint field and the solar position parameter of current time generates pedestrian layer thermal exposure field.Based on grid unit, rely on the form constraint field generated by the digital surface model of fusion topography, building and vegetation, combine solar position parameter to reconstruct pedestrian layer thermal exposure field, consider the radiation interaction of building, vegetation, topography, can solve the defect that two-dimensional remote sensing evaluation microcosmic thermal heterogeneity is lost, and with human thermal perception deviation is big.

The present invention provides a method for detecting an analyte in a sample, the method comprising: (i) providing a mixture comprising the sample and a reporter reagent to a device, the reporter reagent comprising a photosensitizer, the device comprising a substrate having an optical component and a binding component, the optical component and the binding component attached to a surface of the substrate; (ii) allowing a portion of the reporter reagent to bind to the surface of the substrate by the binding component in proportion to the concentration of the analyte; (iii) irradiating the device with electromagnetic radiation for absorption by the optical component and absorption by the photosensitizer of the reporter reagent, such that the optical component absorbs the electromagnetic radiation to produce an excited optical component, and the photosensitizer of the reporter reagent bound to the surface of the substrate absorbs the electromagnetic radiation and interacts with the excited optical component to change the excited optical component from a first optical state to a second optical state, thereby forming a series of localized regions on the substrate having the second optical state; and (iv) detecting the series of localized regions on the substrate having the second optical state.

A scintillator evaluation method according to the present invention includes steps S1 to S5. In step S2, a waveform f(t) of an electric signal output from a photodetector that has received scintillation light generated by a scintillator is obtained. In step S3, computation is performed to deconvolve the electric signal waveform f(t) with an impulse response function i(t) of the photodetector. In step S4, the result of the computation in step S3 is fitted with a model function represented by the convolution of s(t) and p(t), where s(t) is a time response function of the scintillator, including information concerning both rising and falling the generation of scintillation light due to interactions with radiation, and p(t) is a function representing the single photon time resolution of the photodetector. In step S5, the time response of the scintillator is evaluated on the basis of the result of the fitting. Thus, a scintillator evaluation method that makes it possible to evaluate the time response of a scintillator in short time with high accuracy is realized.

The present invention belongs to the field of semiconductor detection, and specifically relates to a solid-state Frisch grid device based on a perovskite material, and a preparation method therefor. On the basis of inherent defects of existing virtual Frisch grid structures, provided in the present invention is a solid-state Frisch grid device based on a perovskite semiconductor material. The specific preparation method comprises: a direct growth method using a solution method, a mechanical fabrication method, etc. The weight potential field distribution of a device is greatly limited at a grid location, which indicates that a grid can provide a good charge shielding effect. Moreover, by comparing weight potential distributions at different grids, it can be seen that the solid-state Frisch grid structure used in the present invention can realize a more uniform and near-ideal weight potential field distribution by means of the adjustment of grid parameters. In addition, by means of further analyzing signals from an anode, a cathode and a gate in an individual event, more accurate information, such as pulse rise time information and radiation interaction location information, can be obtained.

To provide a radiation monitor capable of measuring a radioactive substance with high accuracy by suppressing the influence of a contamination component.SOLUTION: A radiation monitor includes a flow path section through which a detection target liquid containing a radionuclide flows, a phosphor layer that emits photons by interaction with radiation emitted by the radionuclide, and a β-ray transmission layer that is arranged between the phosphor layer and the flow path section and attenuates and absorbs the radiation emitted by the radionuclide in the flow path section.SELECTED DRAWING: Figure 4

A method of detecting radiation from a source and a radiation detection system embodying the principles of the method are described. The method comprises: positioning a detector to receive radiation from the source; applying a multiplexing transformation to radiation from the source to create complexity in three dimensions in the pattern of radiation from the source; receiving a plurality of responses each being a response to an interaction with incident radiation occurring within the detector; determining, for each of the plurality of responses, a characteristic of the interaction, wherein the characteristic comprises at least a position in three dimensions of the interaction within the detector; processing the said plurality of responses in accordance with the determined position in three dimensions of each interaction within the detector and drawing inferences therefrom regarding the pattern of radiation from the source.

A radiation detector (10) is provided with a scintillator (11), a light detector (12), and a processing unit (13). The processing unit (13) includes a signal waveform acquisition unit (14), a deconvolution calculation unit (15), and an interaction time detection unit (16). A signal waveform acquisition unit (14) acquires a waveform f (t) of an electric signal output from a photodetector (12). A deconvolution calculation unit (15) performs a deconvolution calculation of the impulse response function i (t) of the photodetector (12) on the electrical signal waveform f (t) acquired by the signal waveform acquisition unit (14). An interaction time detection unit (16) detects, as an interaction time, the time at which the waveform calculated by the deconvolution calculation unit (15) reaches a threshold value. As a result, a radiation detector capable of improving the temporal resolution of the detection of the radiation interaction timing in the scintillator is achieved.

A nuclear voltaic power source utilizing liquid xenon as a high-density scintillation transducer medium combined with radioisotopes for electrical power generation. Liquid xenon, maintained at cryogenic temperatures between −111.75 and −108.1 degrees Celsius, has a density of approximately 2942 kg / m3, providing roughly 545 times the radiation interaction density of gaseous xenon. Ionizing radiation from the radioisotope interacts with liquid xenon to form Xe2 excimers that emit VUV photons at approximately 175 nm with a yield of 46 photons / keV. These photons are absorbed by wide bandgap semiconductor converters (diamond, AlN, SiC, GaN) lining the containment structure, generating electron-hole pairs extracted as electrical current. The spherical containment geometry maximizes photon capture. Cryogenic thermal management using vacuum-jacketed insulation or active cooling maintains the liquid phase. Multiple cells may be connected in series-parallel arrays for scalable power output.