11 results about "Radon exhalation" patented technology

The invention discloses a method and equipment for identifying a radon release dominant channel in a granite surrounding rock underground space, a medium and a product, and relates to the field of data processing. The method comprises the following steps: according to content information of granite surrounding rock radionuclides, obtaining space distribution characteristics of radon parent nuclides in different types of surrounding rocks, and combining the characteristics to obtain radon background characteristics of an underground space; the method comprises the following steps: acquiring the distribution characteristics of faults, fractures or flowing water fractures at high radon concentration points in underground space air, and identifying the fracture occurrence information and radon precipitation dominant channel information corresponding to potential radon precipitation dominant channels by using the distribution characteristics; and based on radon precipitation dominant channel information and in combination with underground space ventilation conditions, screening to obtain radon measurement instrument point locations to be arranged by the radon continuous monitoring system. According to the invention, accurate identification of the radon release dominant channel is realized, technical support is provided for design of a radon continuous monitoring system in an underground space, and scientific support is provided for radon protection in the underground space.

The present invention relates to a radon exhalation rate measuring instrument calibration device and a radon exhalation rate control method thereof, and relates to the field of radon exhalation rate measurement. The device comprises a diffuse solid radon source, a solid radon source placement cavity, a radon accumulation cavity, a diffusion medium, an air pressure balance device, a support frame and a fixing frame; a circular cone at the bottom of the radon accumulation cavity is connected to the solid radon source placement cavity, and the top of the radon accumulation cavity is sealed by a diffusion medium, the diffusion medium comprises a gypsum board and a high-density board, and the high-density board is above the gypsum board; the air pressure balance device is connected to the radon accumulation cavity, and the air pressure balance device is used to maintain a dynamic balance between the radon accumulation cavity and the ambient atmospheric pressure; and the radon exhalation rate on the surface of the diffusion medium is determined according to the thickness of the diffusion medium layer and the activity of the solid radon source in the solid radon source placement cavity. The invention improves the stability and uniformity of radon exhalation rate measurement and realizes calibration of different radon exhalation rate measuring instruments to be tested by adjusting the radon exhalation rate of a radon exhalation rate measuring instrument testing device.

The invention discloses a soil surface radon exhalation rate correction method based on a Kalman filtering algorithm. The method comprises a measurement process, a data processing process and a calculation process. In the measurement process, performing nonlinear fitting on radon concentration values measured by a radon measuring instrument at different time to obtain a measured soil surface radon exhalation rate value Jt; in the data processing process, environment noise in the measurement process and measurement noise carried by an instrument are set to be random signals in the Kalman filtering process, a corrected radon concentration value is obtained through a Kalman filtering algorithm, and the radon exhalation rate corrected through the Kalman filtering algorithm is obtained through nonlinear fitting. And comparing the corrected value, the measured value and the theoretical value of the soil surface radon exhalation rate Kalman filtering algorithm. According to the method, measurement errors caused by instruments and environments in the measurement process can be corrected, the accuracy of the radon exhalation rate on the soil surface is improved, and a basis is provided for subsequent application and treatment.

The invention discloses a method for predicting the radon exhalation rate of an ore body under a multi-factor coupling condition. The method comprises the following steps: collecting a rock sample in a mining area and processing the rock sample into a standard sample; measuring the porosity and the radium content of the sample; judging whether the porosity and the radium content are the same or not; and calculating the radon exhalation rate by utilizing a plurality of equation prediction models based on parameters such as temperature, water content, porosity and radium content. The radon exhalation rate prediction method comprehensively considers the coupling effect of multiple factors such as temperature, moisture content, porosity and radium content, overcomes the defects of a single-factor model, realizes more accurate prediction and effective prevention and control of radon exhalation behaviors of a mine, has good practicability, economical efficiency and popularization value, and is suitable for popularization and application. And powerful technical support is provided for mine radiation protection and safety production.

The invention discloses a device and method for measuring the radon exhalation rate and the radon leakage rate on the surface of a medium in an open-loop mode. The device comprises an RAD7 radon measuring instrument, a drying pipe and a ventilation chamber. The air inlet large circular pipe of the ventilation chamber is communicated with the outside through an air inlet small circular pipe on the ventilation chamber, the air outlet large circular pipe is communicated with the air inlet of the drying pipe through a pipeline, the air outlet of the drying pipe is communicated with the air inlet of the RAD7 radon measuring instrument, and the air outlet of the RAD7 radon measuring instrument is communicated with the environment. The radon exhalation rate measurement and calculation comprises the following steps: calculating corresponding radon exhalation rates by respectively utilizing the radon concentration average values obtained during open loop and closed loop, and comparing the radon exhalation rates to determine the radon exhalation rate on the surface of the open-loop medium. The radon leakage rate measurement and calculation includes the steps that the amount of radon separated out of the soil surface in the ventilation chamber is obtained through the Fick's law, and the leakage rate of the air inlet large circular pipe is calculated according to the amount of radon. The device is simple in structure and convenient to use, the pumping effect in the measuring process is reduced, and the result is more accurate; the radon leakage rate can be accurately measured, and a basis is provided for subsequent processing.

The application provides an open area radon emission rate prediction method based on VMD-LSTM-ELMAN, first, the radon emission rate historical data is decomposed into three components with different characteristic information by VMD, then the data training and prediction are carried out by selecting the LSTM model, the ELMAN neural network model and the normal distribution model, and the environmental factors affecting the radon emission are taken as the prediction index to input the model, so that the influence of the environmental index on the radon emission can be more truly reflected, the model prediction result can accurately reflect the emission law of the radon emission, and the prediction precision is high. The radon emission rate prediction model is established by jointly using VMD, LSTM and ELMAN, the lagging effect of the environmental index on the radon emission rate is specially considered, the radon emission rate value curve is decomposed and the change trend is predicted, and guidance is provided for radon prevention and control and environmental management.

The invention discloses a uranium mine surface radon exhalation rate ex-situ measurement device and a measurement method, the uranium mine surface radon exhalation rate ex-situ measurement device comprises a gas collection hood and a gas extraction piece, a closed-up gas collection channel is arranged above the gas collection hood, the surface of the gas collection channel is provided with two symmetrically arranged connecting pipes, the bottom of the gas extraction piece is provided with insertion holes corresponding to the connecting pipes, and the insertion holes are communicated with the gas collection hood. The air extracting piece is connected with the air collecting channel at the inserting hole through connecting pipes, an air pump is arranged at the end of one connecting pipe, an output pipe extending outwards is arranged on the surface of the air extracting piece, an annular clamping support is arranged in the air collecting channel, a steel wire cage frame is supported above the annular clamping support, and a drying agent is arranged in the steel wire cage frame; the uranium mine surface radon exhalation rate ex-situ measurement device can effectively collect, transfer and precipitate radon gas, is not limited by gas collection positions and environments during measurement, avoids radiation hidden dangers, can efficiently and accurately measure, provides technical support for ecological restoration, and is suitable for popularization and application.

The invention discloses a method for evaluating radioactive contamination of a decommissioned uranium mine area based on multi-source data fusion, and relates to the field of uranium mine area governance, and the method comprises the steps: detecting the radon exhalation rate, the radon concentration, the gamma air absorbed dose rate and the radionuclide content in soil of a to-be-evaluated decommissioned uranium mine area; calculating the public radiation dose according to the radon concentration and the gamma air absorption dose rate of the decommissioned uranium mine area; detecting the radioactive element concentration in the surface water of the decommissioned uranium mine area and the radioactive element content in the water sediment; calculating a Nemerow index as a comprehensive pollution index of the surface water based on the concentration of radioactive elements in the surface water; calculating a geocumulative index based on the content of radioactive elements in the water-based sediment as a comprehensive pollution index of the water-based sediment; and performing radioactive pollution assessment on the decommissioned uranium mine area according to the radon exhalation rate of the decommissioned uranium mine area, the public radiation dose, the radionuclide content in the soil and the comprehensive pollution index of the surface water and the water sediment.

The invention discloses a device and method for measuring the radon exhalation rate and the radon leakage amount on the surface of a medium in an open-loop mode. The device comprises an RAD7 radon measuring instrument, a drying pipe, a ventilation chamber and a pipeline. The ventilation chamber comprises a cuboid cover, an air outlet large round pipe, an air outlet small round pipe, an air inlet large round pipe, an air inlet small round pipe and a removable sleeve; three air inlet large round pipes with removable sleeves are installed on one side face of the cuboid cover at equal intervals, an air inlet small round pipe is vertically installed on the air inlet large round pipe in the middle, the ventilation chamber is communicated with a drying pipe through a pipeline, the drying pipe is communicated with an RAD7 emanometer, and the RAD7 emanometer is communicated with the atmospheric environment. By measuring, calculating and comparing the open-loop radon exhalation rate and the closed-loop radon exhalation rate, the change of device parameters is controlled, the medium surface radon exhalation rate measured in an open-loop mode is obtained, and the radon leakage amount is calculated according to the Fick law. The device is simple in structure and convenient to calculate, pumping and leakage during open-loop measurement of the radon exhalation rate on the soil surface can be effectively reduced, and the measurement result is more accurate.

The utility model discloses a uranium mine surface radon release rate ectopic measuring device, including the gas collecting cover and the air extraction spare, the upper portion of gas collecting cover is equipped with the gas collecting channel of closing, the surface of gas collecting channel is equipped with two symmetrical connection pipes, the bottom of air extraction spare is equipped with the insertion hole corresponding with connection pipe, air extraction spare is connected with gas collecting channel through connection pipe at insertion hole, and the one end of one connection pipe is equipped with air pump, and the surface of air extraction spare is equipped with the output pipe extending outward, the inside of gas collecting channel is equipped with annular card holder, the upper portion of annular card holder is supported with steel wire cage frame, and the steel wire cage frame is equipped with drying agent, this uranium mine surface radon release rate ectopic measuring device can effectively collect and transfer the radon gas, is not restricted by the gas collection position and environment when measuring, avoids the radiation hidden danger, and is suitable for widely using.

A calibration device for a radon exhalation rate measuring instrument and radon exhalation rate control method thereof is provided, and relates to the field of radon exhalation rate measurement. The device includes a diffusive solid radon source, a solid radon source containing chamber, a radon accumulation chamber, a diffusion medium, an air pressure balancing device, a support frame and a fixture; a circular cone opening at a bottom of the radon accumulation chamber is connected with the solid radon source containing chamber, a top of the radon accumulation chamber is sealed by the diffusion medium, the diffusion medium includes a plasterboard and a high-density wood board, the high-density wood board is on the plasterboard, the air pressure balancing device is connected with the radon accumulation chamber, and configured to maintain dynamic balance between the radon accumulation chamber and ambient atmospheric pressure.