Preparation device and method for certified standard substance used for analyzing plutonium in filter material sample
A standard material and preparation device technology, which is applied in the field of metering and transmission, can solve the problems of not considering the distribution of particles in the filter material, reliability problems, etc., and achieve the effect of good representation, simple method and simple device
Inactive Publication Date: 2013-11-20
NORTHWEST INST OF NUCLEAR TECH
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However, none of the above methods fully meet these requirements, especially without considering the distribution of particulate matter in the filter material.
Therefore, the reliability of the analytical methods tested by these methods is also questionable
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[0043] according to figure 1 The connection relationship shown is to establish the filter material standard substance preparation device. The basic principle of the Venturi tube is: when the gas flows through the pipe, its flow velocity will change with the size of the cross-sectional area of the pipe; Reach the maximum; when the upstream pressure is high enough, the throat gas flow rate will reach the speed of sound, while the throat pressure will be lower than the downstream pressure, resulting in negative pressure.
[0044]Among them: the venturi tube inlet of the diffuser is a round chamfer, the diameter of the throat is 4.0mm, the outer diameter of the vacuum tube is 3.2mm, the inner diameter is 1.9mm, and the angle of the gradual expansion section is 7°; the absolute pressure of the high-pressure gas of the diffuser is 0.2 MPa. The dispersion pipeline is a gradually expanding pipe with a rectangular cross-section, the upper end is 75mm×65mm, the lower end is 230mm×18...
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The invention relates to a preparation device for a certified standard substance used for analyzing plutonium in a filter material sample. The preparation device comprises a soil sample dispersion unit and an aerosol dispersion unit, wherein the soil sample dispersion unit comprises a high-pressure gas source, a pressure gauge, a disperser and a soil sample tray, a high-pressure gas passes through the pressure gauge and the disperser and enters the aerosol dispersion unit from the upper part of the disperser, and the pressure of the high-pressure gas source is controlled to enable the high-pressure gas to be introduced into the disperser and pass through a Venturi tube to generate negative pressure at the throat of the Venturi tube, so that soil sample particles in the tray can be sucked by a dust suction tube and dispersed by the high-speed gas to form aerosol. According to a preparation method of the standard substance of a filter material, soil CRM is dispersed by using a sonic nozzle disperser to form the aerosol and deposited on the empty filter material in a pipeline to form a standard sample. Standard values of components in the filter material sample are calculated according to the standard value of plutonium content in the soil CRM and the mass of soil on the filter material. The preparation method is simple in structure and operation, accurate in measurement and delivery, and convenient to prepare the filter material standard sample used in a laboratory.
Description
technical field [0001] The invention belongs to a metering transfer method, and in particular relates to the preparation of standard substances for plutonium analysis in filter material samples. Background technique [0002] The research on the concentration and isotope ratio of artificial nuclide plutonium in the atmosphere is of great significance to the study of atmospheric radiation environment. Atmospheric nuclear tests and nuclear accidents are the main sources of plutonium in the atmosphere. The monitoring of plutonium in the atmosphere usually uses the filtration method to enrich a large amount of particulate matter in the air, and removes the filter matrix by ashing and other methods. The recovery rate of the chemical process. However, in the ashing and pretreatment process, the recovery rate cannot be indicated due to the different chemical forms of the diluent and the nuclide to be tested. Therefore, there is no effective method to determine the recovery rate of ...
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IPC IPC(8): G01N1/28
Inventor 刘龙波唐寒冰李冬梅
Owner NORTHWEST INST OF NUCLEAR TECH