High-efficiency particle size separation and sampling device for artificial radioactive aerosol and natural radioactive aerosol

Abstract

The invention relates to a high-efficiency particle size separation and sampling device for artificial radioactive aerosol and natural radioactive aerosol. The device comprises a collection gas chamber, a separation gas chamber, a gas chamber bottom plate, a gas chamber partition plate, an adjusting gasket, a nozzle, a collection nozzle, a collection tube and a baffle plate, wherein the whole collection gas chamber used for collecting small-diameter particles is of an annular structure with openings at two ends; the upper end surface of the collection gas chamber is fixedly connected to the lower end of the separation gas chamber through the gas chamber partition plate; the lower end surface of the collection n gas chamber is fixedly connected to the gas chamber bottom plate through the adjusting gasket; the nozzle used for being connected to an external atmosphere collection pipeline penetrates through the middle of the upper end of the separation gas chamber and is fixedly connectedto the separation gas chamber through a bolt; and the collection nozzle used for separating the particles penetrates through a position, corresponding to the nozzle, of the middle of the gas chamber partition plate. According to the device, the requirements for classified sampling measurement of the radioactive aerosol in different particle size ranges can be met, and the device has the advantagesof high separation efficiency and small particle tube wall loss and can be used as grading measurement of the aerosol within the different particle size ranges such as PM0.5, PM1.0, PM2.5, PM10 and the like of the atmospheric environment.

Description

technical field [0001] The invention relates to nuclear and radiation monitoring technology, in particular to a high-efficiency particle size separation sampling device of artificial radioactive aerosol and natural radioactive aerosol. Background technique [0002] In the process of nuclear industry production and nuclear waste disposal, there are certain artificial radioactive substances such as plutonium and enriched uranium. These nuclide particles are likely to be dispersed in the air to form radioactive aerosols. If the staff inhales all kinds of radioactive aerosols, it will cause serious internal radiation damage. Therefore, it is necessary to monitor the concentration of artificial aerosols in these workplaces to ensure the safety of workers and provide technical support for timely adoption of emergency measures in the event of an accident. [0003] In artificial radioactive aerosol monitoring, the interference of radon and its progeny aerosols is the biggest obstac...

AI Technical Summary

Problems solved by technology

The "Radioactive Aerosol Particle Size Separation Sampling Device" (Patent No.: 200510056786) published by the Chinese Academy of Radiation Protection, this patent solves the interference of radon progeny to artificial radioactive aerosol monitoring to a certain extent, but the invention still has the following problems: (1) The separation efficiency of the separation nozzle and the collection nozzle, and the separation efficiency of radioactive aerosols in different particle size ranges are not ideal; (2) There is a large particle wall loss in the wall structure of the collection pipe; (3) It cannot be realized Separation nozzle, collection nozzle size adjustment

These problems affect the accuracy of the measurement results to a certain extent

Images