7 results about "Gamma irradiation" patented technology

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.

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.

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 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.

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.