16 results about "Gamma irradiation" patented technology

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.

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.

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.

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 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.

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 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.