25 results about "Gamma irradiation" patented technology

The application discloses a kind of gamma irradiation medium modules, including irradiation container and the several medium modules being arranged in irradiation container, irradiation container and medium module are cuboid structure;The length and height of single medium module are slightly less than the length and height of irradiation container one third respectively, the width of single medium module is slightly less than the width of irradiation container;The number of all medium modules=the number of medium module in full load in irradiation container * irradiation station number, irradiation station is used to place irradiation container;A dose field test and analysis method for gamma irradiation medium module is also disclosed.The application clearly medium module in irradiation container in loading mode and related parameters such as radiation safety, clearly irradiation device dose field is carried out mathematical simulation, the establishment of OQ dose field test coordinate system, dose meter is laid out mesh and point, the analysis use method of actual measurement dose data, provides proof data and technical basis, effectively improves core technical ability and quality assurance ability.

The invention discloses a stabilizer for a transparent PVC (Polyvinyl Chloride) product with good gamma-ray irradiation resistance. Comprising the following components in parts by weight: 10-20 parts of benzoic acid organic calcium salt, 10-20 parts of benzoic acid organic zinc salt, 10-20 parts of benzoic acid organic magnesium salt, 10-20 parts of benzoic acid organic aluminum salt, 20-30 parts of hydrotalcite, 5-10 parts of borate, 3-10 parts of a pyrimidine auxiliary color retention agent, 3-10 parts of a hindered amine light stabilizer and 5-10 parts of a thioester antioxidant. The hindered amine light stabilizer is a light stabilizer with a hindered amine methyl piperidine structure. The transparent PVC product added with the stabilizer has excellent gamma-ray irradiation resistance, and after the irradiation dose is 25kGy, the yellowness index YI of the transparent PVC product is less than 5.0, which indicates that the transparent PVC product added with the stabilizer does not change color in later application and storage processes after gamma-ray irradiation; the transparency is kept well, the light transmittance after irradiation is greater than 85%, and the transparency requirements of medical and food packaging are met; the mechanical property is well maintained, and the tensile strength retention rate after irradiation is greater than 90%.

The application provides a rotating sample stage and a control method. A center rocker mechanism and a driving module are arranged in an atmospheric environment outside a vacuum scattering cavity, away from a high-flux neutron radiation area at the center of a sample, so that electronic components and precision mechanical parts are prevented from being damaged by neutron / gamma irradiation, and the long-term reliability and service life of the equipment are significantly improved.

This application discloses a bonding agent, its preparation method, and its application, belonging to the field of plexiglass technology. The bonding agent provided in this application is prepared by polymerization of the following raw materials in parts by weight: 90-95 parts by weight of methyl methacrylate; 5-10 parts by weight of modifier; 0.2-0.7 parts by weight of first initiator; and 0.05-0.2 parts by weight of second initiator. The modifier comprises an aromatic acrylate monomer, a piperidine scavenger, and a shielding agent. This application achieves excellent gamma-radiation resistance through the synergistic effect of energy absorption, free radical capture, and radiation shielding; and exhibits high bonding interface strength and no delamination. Plexiglass made with this bonding agent maintains excellent mechanical properties while having an initial light transmittance ≥91% and a yellowing index <1.2% after 10 kGy gamma irradiation, making its comprehensive performance suitable for various harsh application scenarios.

A ready-to-use, gamma-ray sterilized, surgical antiseptic composition comprising an initial non-toxic concentration of povidone-iodine above a minimum effective concentration of available iodine, iodide in sufficient quantity to provide donor iodine upon gamma irradiation to stabilize said povidone-iodine and maintain said minimum effective concentration of available iodine, and a buffered saline solution.

The invention discloses a nano preparation for efficiently preventing and controlling rice blast as well as a preparation method and application thereof, and belongs to the technical field of rice blast prevention and control. The nano-selenium preparation comprises chitosan, nano-selenium, gamma-irradiated nano-montmorillonite and a 1% (v / v) acetic acid solution, the concentration of the chitosan is 0.01%. 2% (m / v), the concentration of the nano-selenium is 0.01%. 1% (m / v), and the concentration of the nano-montmorillonite subjected to gamma irradiation is 0.1%. 1% (m / v). The method has the beneficial effects that after the chitosan and the nano-selenium material are sprayed to the rice leaves, a protective film is formed on the surfaces of the rice leaves, and after gamma-irradiated montmorillonite is added, the uniformity and durability of the protective film can be improved, the acting effect of the nano-selenium protective film is improved, rain wash is effectively resisted, infection of pyricularia oryzae is efficiently blocked, and the yield of the rice leaves is increased. The spore germination process of the pyricularia oryzae is inhibited, the rice blast can be effectively prevented, and the food safety is guaranteed.

The present invention relates to a gamma-irradiation-induced nanocrystalline oxide layer on the surface of a Sn-based solder and a preparation method thereof, belonging to the technical field of nanomaterial preparation. The nanocrystalline oxide layer on the surface of a Sn-based solder is prepared using a gamma-irradiation-induced nanocrystalline oxidation method. The nanocrystalline oxide layer has an average grain diameter of 10-20 nm and a thickness of 50 nm to 1 μm. This significantly shortens the growth cycle of the oxide on the solder surface, increases the upper limit of the oxide thickness, and improves the corrosion resistance of the material.

This invention provides an improved depth filtration medium with reduced extractant for DSP filtration and clarification applications. Furthermore, it provides an improved depth filtration medium that is compatible with gamma irradiation-based filter sterilization processes. [Solution] A depth filtration medium is provided for clarifying the recovered material from a feed stream of a cell culture containing therapeutic biomolecules. The depth filtration medium is composed of a sintered mixture of a polymer adsorbent and a thermoplastic binder, has extremely low extractability, and does not require pre-washing before use. Furthermore, the constituent materials used in the sintered depth filter medium exhibit high stability to gamma rays and are compatible with gamma-based pre-use sterilization processes.

A Coriolis flow sensor includes a metal flow tube and an enclosure. The enclosure encloses the flow tube and is constructed at least partially from a gamma transparent material. The metal flow tube may be constructed from stainless steel. The gamma transparent material and the flow tube are thin enough to permit sterilization of an interior of the flow tube by gamma irradiation of the flow tube through the gamma transparent material. The enclosure is also shaped to facilitate locking and unlocking the Coriolis flow sensor in place on a mounting structure.

The invention relates to the technical field of plastics, in particular to a preparation method of a sterile plastic box for irradiation sterilization, which comprises the following steps: preparing raw materials; performing hot melting on the prepared raw materials, adding the modified compound, stirring, uniformly mixing the modified compound and the raw materials to form a mixture, and performing hot melting; extruding the mixture to form a single plate; overlapping and extruding the plurality of single plates to form a high-performance sheet; the high-performance sheet is attached to a mold and subjected to extrusion forming, and a plastic box is formed; cutting the plastic box subjected to extrusion forming; and irradiation sterilization is carried out in a gamma ray environment, so that the problem that a conventional material box is easy to deform after being subjected to gamma irradiation is solved.

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.

This invention discloses a method for preparing a gamma-ray resistant gel, comprising the following steps: First, under room temperature conditions, all chemical components are sequentially added to a container and stirred until all components are completely dissolved to obtain a homogeneous liquid gel. The chemical components consist of a solvent, a reference electrolyte, a buffer system, and a polymer gelling agent. After irradiating the prepared gel with 55 kGy of gamma rays, the viscosity increased from 129.48 cP before irradiation to 190.4 cP, while maintaining a viscous liquid state. The pH value changed from 6.912 before irradiation to 6.992, a change of less than 0.1 units. This demonstrates that the gel remains physically and chemically stable after gamma irradiation, without degradation, ensuring that the reference electrode can still be used normally after irradiation sterilization, meeting the requirements of disposable pH sensors in hygienic applications.

The present invention discloses a detector system for an offline sniffing and leakage test device, which includes a shielding body and a gas detection device provided in the shielding body. The gas detection device includes a sampling chamber provided in the shielding body, a first detection component provided on one side of the sampling chamber, and a second detection component provided on the other side of the sampling chamber. The first detection component is inserted into the sampling chamber to detect the activity concentration values of Xe-133 and Kr-85 by detecting beta rays, and the second detection component is inserted into the sampling chamber to detect the activity concentration value of Xe-133 by detecting gamma rays. The detector system for the offline sniffing and leakage test device can be used to measure the activity concentrations of Kr-85 and Xe-133 in the pipeline of the sniffing and leakage system and output the energy spectrum information of Kr-85 and Xe-133. Considering the relatively high gamma irradiation background level at the site, a special auxiliary detector is also provided to reduce the interference of environmental background fluctuations. Moreover, the detector system for the offline sniffing and leakage test device has high detection sensitivity and strong anti-interference ability, and can realize the detection of slightly defective components.

The present application relates to a kind of irradiation experimental line mechanism, including walking part and fixed part, walking part includes experimental box, the suspension chain of experimental box top and anchor iron being arranged at the bottom of experimental box are constituted;Fixed part includes the track for the walking of suspension chain, and the limiting anchor rail that is arranged below track and cooperates with anchor iron.Implementation, the experimental box can utilize irradiation device monitoring line to carry out irradiation experiment, provide effective data for small-dose gamma irradiation processing, realize the stable balance of irradiation dose range;For the effective data obtained by experimental box, draw out isodose distribution curve diagram, the index such as the statistics equivalent maximum dose area, equivalent minimum dose area, dose non-uniformity, main control time and absorbed dose relationship, so that production line can carry out small-dose precision irradiation, avoid capacity waste.

The present invention belongs to the field of chemical energy storage and discloses a method for preparing low-cost, high-strength biomass fiber-based cellulose-based polymer composite solid electrolytes based on gamma irradiation. The polymer solid electrolyte uses biomass materials as raw materials, and adopts a combination of chemical treatment and mechanical treatment to prepare nanocellulose, which is then compounded with a polymer solid electrolyte matrix material by a blending method to prepare a polymer solid electrolyte membrane. The biomass fiber-based polymer solid electrolyte is irradiated with gamma rays, and its long polymer chains undergo shear and cross-linking reactions. At the same time, oxygen-containing functional groups and nitrogen-containing functional groups are chemically grafted on the fiber surface to form a uniformly dispersed and firmly anchored fiber-based polymer solid electrolyte. These processes cause the polymer chain segments to become shorter, increase the proportion of the amorphous phase, and thereby promote the formation of a higher ion migration number and a wider electrochemical window, thereby improving the safety of the battery.

The present disclosure relates to an affinity chromatography device comprising a dry fibrillated polymer film having a moisture content of less than or equal to 60 mass% of the dry fibrillated film. When the dry fibrillated polymer film is formed, the non-dry fibrillated polymer film may be dried by freeze-drying. The dry affinity chromatography device may improve the stability or viability of the target molecule being purified, reduce shipping risk (e.g., reduce the risk of accidental rupture or leakage due to falling), and reduce storage risk (e.g., reduce the risk of microbial growth during storage). The affinity chromatography device and / or the dry fibrillated polymer film may be treated with ethylene oxide, gamma irradiation, or X-ray irradiation. In some embodiments, the treatment sterilizes the chromatographic device or dry fibrillated polymer film. The dry affinity chromatography device may be wetted with a bioprocessing fluid prior to use.

A ready-to-use, gamma-ray sterilized, surgical antiseptic composition comprising an initial non-toxic concentration of povidone-iodine above a minimum effective concentration of available iodine, iodide in sufficient quantity to provide donor iodine upon gamma irradiation to stabilize said povidone-iodine and maintain said minimum effective concentration of available iodine, and a buffered saline solution.

A method of obtaining, from a target compound, a radioisotope of a target element comprised in the target compound includes irradiating the target compound with high energy photon irradiation (gamma irradiation). Thereby the target element radioisotope is formed. The method is performed such that the target element radioisotope is of different oxidation state than the target element, and is comprised in a target element radioisotope compound that is separable from the target compound by a physical and / or chemical separation method.

According to the rotary sample table and the control method, the center rocker mechanism and the driving module are arranged in the atmospheric environment outside the vacuum scattering cavity and in a high-flux neutron radiation area away from the center of the sample, electronic components and precision mechanical parts are prevented from being damaged by neutron / gamma irradiation, the long-term reliability of equipment is remarkably improved, and the service life of the equipment is remarkably prolonged.

The present application relates to the technical field of three-dimensional integrated microsystem, and particularly relates to a proton and gamma radiation simulation modeling method and system of a microsystem interconnection module based on TSV. The method comprises: obtaining geometric parameters and material characteristics of a through silicon via, a redistribution layer and a micro bump, establishing a three-dimensional finite element model and analyzing its scattering characteristics, and constructing a correlation model of material characteristics and scattering parameters; extracting circuit parameters in an ADS compilation environment, establishing an RLC equivalent circuit and its correlation with scattering parameters; through a proton and gamma irradiation experiment, obtaining experimental data of scattering parameters under different doses, and then establishing a correlation model between radiation dose and scattering parameters and RLC parameters, to realize accurate prediction of the electrical performance of a three-dimensional integrated microsystem module under different radiation conditions, and to provide a scientific basis for reliability design of a three-dimensional integrated microsystem module in a radiation environment such as aerospace.

The invention discloses source storage well water guarantee equipment for a radioactive source of an industrial gamma irradiation device. The source storage well water guarantee equipment comprises a water replenishing assembly, a well water purification and temperature control circulation assembly, an electrical control and detection assembly, a pipeline and a one-way check valve, and the water replenishing assembly is communicated with the well water purification and temperature control circulation assembly through the pipeline and the one-way check valve; the well water purification and temperature control circulating assembly comprises a source storage well, a circulating pump, an activated carbon filter, a first precision filter, a polishing resin mixed bed, a heat exchanger, a compressor and a secondary check valve; the circulating pump drives well water to sequentially flow through the activated carbon filter, the first precision filter and the polishing resin mixed bed to be purified, and then part of well water is cooled through the heat exchanger, the compressor and the secondary check valve and flows back to the source storage well. The device can solve the problems of manual operation, tedious operation, low parameter precision, poor collaboration and poor safety of a source storage well water treatment system in the prior art.

A meltblown material formed from bicomponent fibers that can withstand the effects of a gamma irradiation sterilization process without negatively impacting bacterial filtration, particulate filtration, and / or breathability of personal protective equipment products formed from the meltblown material (e.g., facemasks, surgical gowns, surgical caps, etc.) is provided. The bicomponent fibers include a polyolefin-based sheath and a polyester-based core. Further, both the sheath and core include specific antioxidants and charge enhancer packages that allow for the effective electret treatment of the resulting meltblown material prior to sterilization, where the filtration efficiency and pressure differential of the material are still adequate post-sterilization.

The invention belongs to the technical field of food preservation, and particularly relates to a postharvest cherry preservation method based on low-dose gamma-ray irradiation. The method comprises the following steps: picking cherries in a commodity mature period, irradiating the cherries with low-dose < 60 > Co-gamma rays, and storing the cherries on a shelf. The method is characterized in that the irradiation dose is selected in a targeted mode according to the variety of the cherries, the reduction of the hardness of the fruits can be effectively delayed, the accumulation of the content of soluble solids is promoted, and therefore the texture and flavor of the cherries are maintained, and the dose range is generally 25 Gy to 200 Gy. According to the method, variety-specific low-dose irradiation treatment is adopted, the commodity of cherries is effectively maintained, meanwhile, the edible quality (hardness and flavor) of the cherries is remarkably improved, the problems of fruit softening, flavor deterioration and the like caused by a traditional high-dose irradiation technology are solved, and an efficient, safe and quality-oriented new method is provided for preservation of the picked cherries.

We provide a ready-to-use, gamma-sterilized package containing a gamma-sterilized povidone-iodine solution with an available iodine concentration exceeding the minimum effective concentration. [Solution] A ready-to-use gamma-ray sterilized surgical disinfectant composition comprising an initially non-toxic concentration of povidone-iodine exceeding the minimum effective concentration of available iodine, an amount of iodide sufficient to provide donor iodine after gamma irradiation to stabilize the povidone-iodine and maintain the minimum effective concentration of available iodine, and buffered saline.

The application discloses a numerical simulation method and device for predicting mechanical performance degradation of concrete under gamma irradiation, converts a gamma irradiation dose field into a shrinkage load accumulated with time, and only applies the shrinkage load to a mortar matrix in a three-dimensional mesoscopic model of concrete, so as to realize fine simulation of mortar shrinkage, interface stress concentration and damage evolution under long-term gamma irradiation. By using the technical scheme of the application, the technical problems that the existing method is difficult to consider gamma dose spatial attenuation and mortar shrinkage are solved.