A radioactive aerosol monitor measurement accuracy calibration device and its working method

Abstract

The invention belongs to the fields of radiation monitoring and protection, and provides an apparatus for verifying the measurement accuracy of a radioactive aerosol monitor, and a working method thereof. The apparatus comprises the monitor, an aerosol filter cartridge simulator, a power box and other main assemblies, the monitor comprises a programmable logic control module, a touch screen, a power conversion module, a driving module and various accessories, the aerosol filter cartridge simulator includes a shield protection box, a radiation source tray, a movement screw, a supporting rod, aradiation source and a driving motor, and a large-capacity rechargeable battery and a power supply protection assembly are arranged in the power box. The process of gradual increase of radioactive substances deposited on a filter material in real radioactive aerosol measurement can be simulated, and the radiation source with an increasing radiation intensity is artificially manufactured at a fixedposition in front of a radiation detector to generate counting rate change progressively increasing at a certain slope in the radiation detector in order to check the measurement accuracy of the radioactive aerosol monitor.

Description

technical field [0001] The invention belongs to the field of radiation monitoring and protection, and specifically relates to a radioactive aerosol monitor measurement accuracy verification device and a working method thereof, which are used to check the measurement accuracy of the radioactive aerosol monitor at the equipment use site. examine. 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 produ...

AI Technical Summary

Problems solved by technology

At present, the on-site inspection method of measurement accuracy based on secondary calibration is mostly used for radioactive aerosol monitoring equipment, that is, after the solid radioactive source installed on a specific mechanical structure is coupled with the radiation detection device to ensure that the relative position is fixed, only the aerosol monitoring The radiation detection device in the instrument is calibrated relative to the geometric detection efficiency of the filter material. The advantages are simple equipment, convenient operation, and low cost; the disadvantage is that the solid radioactive source is a point source or a surface source, and does not emit radioactivity as the sampling and filtering proceed. The gradually increasing real measurement process has a large deviation from the actual working state of the aerosol monitoring equipment, and it is impossible to truly test the performance of each component of the aerosol monitoring equipment (especially the algorithm logic in the software) after long-term operation (or storage) on site. Normality, resulting in low confidence in the on-site inspection of measurement accuracy, and the possibility that failures cannot be effectively detected, which affects the normal and reliable operation of radioactive aerosol detection devices, and is not conducive to process safety and personnel radiation in nuclear power plants and other nuclear-related places. Safety

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