6 results about "Liquid scintillation counting" patented technology

The invention relates to a method for testing the tritium release rate of a tritium-containing waste package, and the method comprises the steps: guiding tritium-containing waste gas released by the tritium-containing waste package in an exhaust hood to be continuously input into an ionization chamber online monitoring system, and determining the initial tritium activity concentration; when the first threshold value is lower than the first threshold value, the tritium-containing waste gas flows into an initial bubbling sampler after passing through a refrigerating system to collect tritiated water, and target gas is obtained; enabling the target gas to circularly pass through the operation of the initial bubbling sampler, and replacing a new bubbling sampler every time a first preset time is reached; after a second preset time is reached, stopping the cyclic operation, and testing the target tritium activity concentration of liquid in the bubbling sampler which is replaced for multiple times and the current bubbling sampler by adopting a liquid scintillation counter; and calculating the tritium release rate based on the target tritium activity concentration. Target gas is discharged into the exhaust hood again, tritiated water absorption is carried out on tritium-containing waste gas multiple times, and the technical effects that tritiated water absorption is more complete due to multiple times of cyclic absorption, and the tritium release rate detection result is more accurate are achieved.

The invention relates to the technical field of nuclear material analysis, in particular to a plutonium solution specific activity determination method and application, and the plutonium solution specific activity determination method comprises the following steps: taking a plutonium solution with known specific activity A1 as a standard solution, determining the liquid flash counting rate of the standard solution, and recording the liquid flash counting rate as C1; obtaining a second-order conductance spectrum of the standard solution by using an ultraviolet-visible absorption spectrum method, determining the peak area of a characteristic absorption peak of tetravalent plutonium in the second-order conductance spectrum of the standard solution, and recording the peak area as S1; measuring the liquid flash counting rate of the to-be-measured solution, and recording the liquid flash counting rate as C2; obtaining a second-order conductance spectrum of the to-be-detected solution by using an ultraviolet-visible absorption spectrometry, determining the peak area of a characteristic absorption peak of tetravalent plutonium in the second-order conductance spectrum of the to-be-detected solution, and recording the peak area as S2; and calculating the specific activity A2 of the solution to be detected according to the following formula. According to the method, liquid scintillation counting and ultraviolet-visible spectrophotometry are combined, so that combination of activity response and concentration response is realized, and acquisition of isotope composition of a plutonium solution to be detected and complex sample pretreatment are not needed.

1. The name of the design product: liquid scintillation counter. 2. The use of the design product: the design product is used in liquid scintillation counter measuring equipment. 3. The design points of the design product: the combination of shape and color. 4. The picture or photo that best shows the design points: perspective view. 5. The design for which protection is sought includes color. 6. Other circumstances that need to be explained: the material of the design product is mainly aluminum plate, and the surface is subjected to anodic oxidation and sand blasting treatment.

This invention discloses a method for identifying the bio-based properties of liquid fuels based on a liquid scintillation counter. 14 C isotope analysis is used to determine the bio-based content of liquid fuels, thereby identifying whether the liquid fuel is bio-based, fossil-based, or a mixture of bio-based and fossil-based. The steps include: S1, optimizing the experimental parameters of the liquid scintillation counter; S2, determining the sample counting efficiency; S3, determining the background sample... 14 β decay count of C; S4, calculate the bio-based content of the sample using a combination formula.

This invention discloses a method for assessing lipid reesterification, belonging to the field of biochemistry. Based on radioisotope-labeled assisted liquid scintillation counting technology, this invention provides a method for evaluating the reesterification of functional lipids. For the reaction of fatty acids with coenzyme A to form acyl-CoA, coenzyme A is labeled with a radioisotope, and the reesterification rate of fatty acids is quantified by calculating the isotope recovery rate in the product. For the reaction of sterols with acyl-CoA to form sterol fatty acid esters, sterols and acyl-CoA are labeled with two different isotopes respectively. The reduction of acyl-CoA in the reactants and the formation of sterol fatty acid esters in the product are characterized by detecting the intensity of the two isotopes simultaneously carried in the product, thus quantifying the reesterification rate of sterols. This invention uses labeled coenzyme A as an evaluator for the metabolic process, precisely locating the lipid metabolic pathway to the esterification reaction involving coenzyme A, eliminating the influence of unknown metabolic pathways.

This invention discloses a method for detecting the specific activity of C14 barium carbonate, belonging to the field of radioactivity detection technology. The method includes: dissolving a C14 barium carbonate sample in a weak acid solution to generate a test solution containing bicarbonate ions; then directly mixing the test solution with a scintillation fluid to obtain a scintillation sample; finally, measuring its radioactivity activity using a liquid scintillation counter and calculating the specific activity based on a standard curve. This invention uses a weak acid to dissolve the C14 barium carbonate sample to generate a test solution containing bicarbonate ions that is directly mixed with the scintillation fluid, omitting the alkaline absorption step and simplifying the detection process from four steps in existing methods to two steps. Furthermore, it eliminates the need for a sealed gas absorption device, removing accumulated errors during sample transfer and the additional background introduced by the alkaline solution. Therefore, this invention reduces equipment requirements and improves detection accuracy and ease of operation.