System platform for calibrating radioactive aerosol monitoring equipment and working method thereof

Abstract

The invention belongs to the field of radiation protection, and provides a system platform for calibrating radioactive aerosol monitoring equipment and a working method thereof. The platform comprises an aerosol generation device, a standard aerosol activity concentration measurement device, a to-be-calibrated aerosol monitoring equipment device, an aerosol recycling device, an electrical control and monitor console, and the like. According to the invention, radioactive aerosol generated by the aerosol generation device simultaneously flows through the standard aerosol activity concentration measurement device and the to-be-calibrated aerosol monitoring equipment device, the obtained radioactive activity concentration is equal, the standard aerosol activity concentration measurement device goes through standard measurement and can accurately measure the activity concentration values of gaseous radioactive aerosol of different activity levels and different types, and thus, a to-be-calibrated detector can be calibrated. The system platform has the advantages of dynamic calibration, high precision, adjustable measurement range, synchronous measurement by the standard device and the to-be-calibrated device, applicability to online monitoring and offline monitoring, and the like.

Description

technical field [0001] The invention belongs to the field of radiation protection, in particular to a system platform for calibrating radioactive aerosol monitoring equipment. Background technique [0002] Radioactive aerosol is a dispersed system formed by solid or liquid radioactive particles suspended in the air or gas medium, and is one of the main radioactive pollutants in nuclear-related places such as nuclear power plants. There are many ways to produce radioactive aerosols, such as the dust produced during the mining, crushing, screening, and grinding of uranium ore, and the formation of aerosols from the solution and meteorological chemical reactions at room temperature during the reprocessing of nuclear fuel, especially in nuclear power plants. A large amount of radioactive aerosols will be produced under accident conditions. Radioactive aerosols have a high ionization effect and are the main threat to human exposure. Therefore, monitoring radioactive aerosols is ...

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Problems solved by technology

At present, most of the radioactive aerosol monitoring equipment adopts the secondary calibration method, that is, the geometric detection efficiency of the aerosol detector is calibrated by replacing the gaseous radioactive aerosol with a solid radioactive source, which has the advantages of simple equipment, convenient operation, and low cost. The disadvantage is that because the solid radioactive source is a point source or an area source, not a real gaseous source, there is a deviation from the working state of the real aerosol monitoring equipment, and it is impossible to measure the influence of some interference factors (such as filter paper filtration efficiency, uniform aerosol deposition, etc.) properties, filter paper tray backscatter, filter paper self-absorption, etc.), resulting in low confidence in the calibration and inaccurate radioactivity concentrations measured in actual work

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