22 results about "Radon" patented technology

The invention discloses a compensation method and system for continuously, rapidly and accurately measuring the radon concentration in air, and the method comprises the steps: taking the number of nuclides in a measurement cavity at the initial moment of a current sampling period as an initial value, and obtaining a time-varying function of the number of nuclides in the measurement cavity in combination with a gas exchange and nuclide decay model; determining the theoretical total count of alpha particles in the current measurement period, and establishing a relational expression between the count of the alpha particles and the number of nuclides; based on the relational expression and the actual measurement count, the number of environmental radon atoms is obtained, and the radon concentration is calculated in combination with a radon decay constant; and finally, combining the number of radon atoms at the current sampling point and a model containing gas exchange and nuclide decay to obtain the nuclide number at the end of sampling, taking the nuclide number as the initial state of the next sampling period, switching the sampling points, and repeating the steps to realize continuous, rapid and accurate sampling. According to the method, through loop iteration, the balance waiting time is effectively saved, and continuous, rapid and accurate measurement of the radon concentration in the environment by a single radon measuring instrument is realized.

A method of monitoring radon in an area, comprising: acquiring a series of radon measurements for the area; obtaining a characteristic value relating to ventilation in the area; and calculating a weighted average from the series of radon measurements. Using a characteristic of the ventilation to calculate the weights allows some knowledge of the ventilation rate to be used in the averaging process so as to improve the quality of the averaged data. With a high ventilation rate, the radon level drops rapidly, with the removal of radon by ventilation dominating any radon source, and so an average can be more strongly weighted towards the current value. With a low ventilation rate, the removal of radon slows and so the noise in the data is taken into account. Combining the actual radon measurements with knowledge of the ventilation rate allows the averaging function to provide better time resolution.

The invention discloses a method for measuring the precipitation rate of Rn-220 on a soil surface in a closed-loop manner. The method comprises a measurement process and a calculation process, the measuring process comprises the steps that the radon collecting cover is inversely buckled on the surface of soil to be measured, the RAD7 radon measuring instrument and the fan are started, and when the numerical value of the RAD7 radon measuring instrument is stable, data measured by the RAD7 radon measuring instrument after the system is stable are recorded. The calculation process comprises the following steps: calculating the radon concentration on the surface of the soil by the RAD7 radon measuring instrument, calculating the Rn-220 concentration at the inlet of the RAD7 radon measuring instrument, calculating the Rn-220 concentration in the internal chamber of the RAD7 radon measuring instrument, calculating the Rn-220 concentration in the radon collecting cover according to the Rn-220 concentration in the internal chamber of the RAD7 radon measuring instrument, and correcting the Rn-220 concentration measured by the RAD7 radon measuring instrument to obtain the actual Rn-220 concentration in the radon collecting cover. And calculating the soil surface Rn-220 precipitation rate according to the Rn-220 concentration in the internal chamber of the radon measuring instrument and the actual Rn-220 concentration in the radon collecting cover. According to the calculation method disclosed by the invention, factors which exist in the measurement device and influence the measurement precision are processed, so that the precipitation rate of the Rn-220 is improved, and a basis is provided for effective processing of the Rn-220 in the next step.

The utility model discloses a spiral constant flow probe for radon survey meter soil survey belongs to nuclear radiation detection technical field, including intermediate connecting piece, and the bottom end detachable connection of intermediate connecting piece has the gas guide main pipe, and the upper surface of intermediate connecting piece is provided with the flowmeter connecting hole and short stick connecting hole, and the bottom end of intermediate connecting piece is the circular truncated cone structure and is provided with the outer thread, and the gas flowmeter is connected with radon survey meter still, and the bottom end of intermediate connecting piece is the circular truncated cone structure and is provided with the outer thread, and the utility model sets up and has the intermediate connecting piece of thread, and the leakproofness between intermediate connecting piece can pass through the thread promotion and the detection soil, to make the measurement result more accurate.

The application provides a method for analyzing the migration heterogeneity of chlorinated hydrocarbon pollution in groundwater in the southern mountainous area by combining isotope tracing and distributed sampling, and belongs to the field of environmental science and engineering technology. The method generates and optimizes the layout of sampling points automatically through a geographic information system (GIS), collects multi-medium samples of soil, water and air, realizes accurate determination of the content of pollutants and isotopes based on the global Moran index and by using isotope systems such as chlorinated hydrocarbon carbon isotopes, chlorine isotopes and radon isotopes. The migration parameters, isotope fractionation coefficients and pollution path probabilities are quantitatively analyzed by using a distributed heterogeneity weighted regression and a Bayesian network model, and the spatial variability and uncertainty are comprehensively explained. Finally, the analysis results are integrated on the GIS platform, and the migration heterogeneity distribution, migration hotspots and risk levels are dynamically presented by using a three-dimensional visualization tool, so that scientific support is provided for the prevention and control of chlorinated hydrocarbon pollution and risk assessment in the southern mountainous area.

This application belongs to the field of mine radiation protection and safety monitoring technology, specifically relating to a method and system for locating radon anomaly sources in mines based on causal graphs. The method includes: standardizing the original data matrix to obtain a feature matrix; obtaining a directed acyclic graph (DAG) based on the feature matrix; using the DAG and the set of parent nodes, constructing marginal distributions for the root node and conditional distribution estimators for the child nodes to obtain a global distribution estimator; calculating the intervention distribution of the feature subset based on the global distribution estimator; calculating the causal Shapley value based on the intervention distribution; retraining the anomaly prediction model after feature filtering to obtain the final anomaly source model; and inputting actual radon concentration time-series data into the final anomaly source model to obtain the anomaly source location. This application has the effect of accurately distinguishing anomaly sources at different locations and achieving globally convergent radon anomaly source location.

The device comprises: a measuring chamber (1), in the form of a hollow cylinder made of a conducting material, through which an air current to be monitored circulates via natural or forced diffusion; a sensor element (2) with three or more planar semiconductor diodes (3) coplanar with the axial axis of the measuring chamber (1), said diodes being arranged along a section of the axial axis in a polygonal shape; a first polarisation source (41) which polarises the measuring chamber (1); a second polarisation source (42) which polarises the anode relative to the cathode; a signal amplifier (5); a discriminator (6); and a processor (7), on which a method with an instantaneous and / or continuous operating mode is performed, providing radon concentration values over measuring periods varying between 5 and 10 mins.

The invention discloses a radon tracing-multi-field coupling river bank karst collapse dynamic early warning method, and belongs to the field of geological disaster monitoring and early warning. The method comprises the following steps: collecting radon concentration data of river water and underground water on both sides along a target river reach system by using a portable radon detector; calculating underground water discharge flux based on the radon concentration data, and generating a discharge flux distribution diagram through spatial interpolation; establishing a radon isotope-seepage-subsurface erosion-mechanical stability multi-field coupling model; based on the multi-field coupling model, calculating karst collapse stability coefficients under different water exchange intensities; determining the variable amplitude of the critical river water level as an early warning threshold value, and dividing risk grades; and dynamic early warning and graded prevention and control based on river water level monitoring are implemented. The radon isotope tracing technology and the multi-field coupling model are combined and applied to karst collapse early warning for the first time. A complete disaster-causing chain of river water level fluctuation, water exchange enhancement, subsurface erosion development, permeability increase and sudden collapse is disclosed.

The invention provides a method for realizing rapid evaluation of surface uranium content by using unmanned aerial vehicle aviation release measurement, and relates to the technical field of unmanned aerial vehicle aviation radioactivity measurement. The method for realizing rapid evaluation of the uranium content of the earth surface specifically comprises the following steps: S1, system background calibration; s2, correcting atmospheric radon; s3, calibrating air sensitivity; s4, uranium content inversion; s5, carrying out data noise reduction processing; and S6, three-dimensional mapping. According to the technology, cosmic rays and equipment background are synchronously deducted through water area measurement, the radon correction coefficient is dynamically adjusted in combination with morning and evening baseline flight, the problems that aerial work of an unmanned aerial vehicle aerial radioactivity measurement system is difficult and radon correction is not accurate are solved, a height attenuation coefficient three-dimensional correction model and a wavelet noise reduction algorithm are adopted, small crystal noise interference is overcome, and the radon correction accuracy is improved. Through uranium content grading drawing and geologic model fusion, the method achieves the quick positioning of an abnormal region, is small in inversion error, is high in verification goodness of fit, remarkably improves the uranium mine verification efficiency and safety of a plateau / unmanned region, and reduces the production cost.

This invention relates to the field of nuclear radiation monitoring and protection, and provides a plug-in type radioactive aerosol monitor, including a plug-in type aerosol detection device, a signal processing and expansion unit, an electronic control unit, a terminal display and communication expansion unit, a differential pressure sensor, and a sampling system. The plug-in type aerosol detection device has a differential pressure sensor connected in parallel at both ends. The signal processing and expansion unit processes the aerosol detector signal and flow signal to identify radioactive aerosol nuclides and calculate the activity concentration of characteristic nuclides in each corresponding energy range. The electronic control unit acquires the differential pressure and flow information, executes the control function of the pump in the sampling system, and prompts the user on the status of the filter paper. This invention is convenient to operate, efficient, and easy to maintain; it has a fast measurement response, strong nuclide identification capability, and a natural radon and thorium progeny compensation function; after detecting anomalies, it can retain representative samples in real time, and the sampling analysis results are highly comparable to real-time monitoring values.

The invention discloses a dynamic background deduction method in radioactive aerosol measurement, and the method comprises the steps: carrying out the energy region division of an energy spectrum of radioactive aerosol to be measured, and obtaining the count of each energy region in a current measurement period; calculating an environment change threshold value for judging the stability of the natural background and an artificial signal threshold value for judging whether an artificial radioactive signal exists or not; predicting the background contribution value of the current measurement period in the artificial energy region based on the received proportionality coefficient set of the previous measurement period and the count of the natural characteristic energy region of the current measurement period; calculating the residual error between the actual count of the artificial energy region in the current measurement period and the background contribution predicted value; according to a comparison result of counting of a natural characteristic energy region and an environment change threshold value and a comparison result of a residual error and an artificial signal threshold value, three different states are divided, and then different strategies are executed to adjust a proportionality coefficient. According to the method, the radon thorium daughter background can be accurately, rapidly and reliably deducted in a full scene.

The invention relates to the technical field of environmental radioactivity detection and nuclear radiation measurement, and discloses a method for automatically determining the relation between scale factors and temperature and humidity of a continuous radon measurement instrument by using an electrostatic collection alpha energy spectrum method. The method comprises the following steps: obtaining a stability score through working condition segmented stability control; periodic synchronous acquisition and data governance are carried out to generate a quality weight; executing reference mapping, scale triple construction and weight inheritance; carrying out constrained weighted robust modeling to generate a scale factor model; executing online correction and credibility gating to output correction concentration; and performing abrupt change monitoring and increment re-learning to realize closed-loop updating of the model. According to the method, accurate correction of temperature and humidity influence scales is ensured through full-link data accurate alignment and mass weight penetration, the long-term reliability and the self-adaptive capability of radon concentration measurement are improved, and the problem of insufficient model precision caused by data disjunction in a traditional method is effectively solved.

The present application relates to the technical field of nuclear radiation detection, and particularly relates to a radon-tritium separation discrimination measurement device and method in a high-radon environment, which comprises a first measurement channel, a second measurement channel, a third measurement channel and a fourth measurement channel, and respectively measures a first current value I1, a second current value I2, a third current value I3 and a fourth current value I4, and respectively calculates the activity concentration C Rn of radon Rn, the activity concentration C HTO of tritiated water HTO and the activity concentration C HT of tritium gas HT according to the first current value I1, the second current value I2, the third current value I3 and the fourth current value I4. The present application focuses on the characteristics of indoor environment, considers the influence of indoor radon on tritium measurement, adopts a series-parallel differential mode, avoids the low detection limit influence caused by multi-channel measurement, is more suitable for low-concentration-level environment measurement, saves the need of purging gas, and simplifies the device structure.

The invention discloses a uranium-radium balance coefficient determination method based on geophysical logging, and relates to the technical field of sandstone type uranium ore core detection. Comprising the following steps: determining radium equivalent uranium content of each unit layer in a target drilled hole, and determining an industrial uranium mine hole; a geophysical prospecting parameter hole is constructed at the industrial uranium mine hole, periodic repeated measurement is carried out, a radium radon balance recovery curve is obtained, and a radium radon balance coefficient is determined; the radium equivalent uranium content of the target drill hole is corrected through the radium radon balance coefficient, and the real radium equivalent uranium content is obtained; and respectively accumulating the real radium equivalent uranium content and the stratum rock uranium content within the same depth range as the industrial uranium mine hole, and determining the uranium radium balance coefficient of the target drill hole according to the ratio of the two accumulated values. According to the uranium and radium balance coefficient obtained through the method, existing information of uranium, accumulated information of radium and dynamic balance information of a radium-radon system are fused, and the actual balance state of uranium and radium at the current position after geological historical evolution can be reflected more truly.

The application discloses a method and system for rapidly measuring the concentration of radioactive radon in air based on a flow type of scintillation. The method is based on the scintillation method for measuring the net count rate of alpha particles, and needs to obtain the net count rate of alpha particles in a corresponding time period in the measurement. In combination with the decay law of radon and daughter and the air exchange condition of a chamber, the relationship between the net count of alpha particles generated by the decay of radon and daughter in newly pumped air in a corresponding measurement time period in the measurement chamber and the volume of the measurement chamber, the pump speed and the radioactive concentration of air in the original chamber is established, so that the sensitivity coefficient of the corresponding measurement of the radioactive radon concentration of the to-be-measured air is obtained, and the radioactive radon concentration in the to-be-measured air is obtained in real time. The method can rapidly and real-timely measure the radioactive radon concentration in air under the condition of a dynamic flow type, can greatly save the measurement time and timely reflect the change of the radon concentration in air, is helpful to protect workers and the public from the harm of radon radiation, is favorable to promoting the safety production of the nuclear industry, and has a wide application prospect.

The application discloses a radioactive substance monitoring system and method in a radioactive waste disposal cave, and belongs to the field of radioactive waste disposal. The radioactive substance monitoring system in the radioactive waste disposal cave comprises a control unit, an exhaust unit, a plurality of radon monitoring devices arranged at intervals in the radioactive waste disposal cave, a plurality of radioactive aerosol monitoring devices arranged at intervals in the radioactive waste disposal chamber and in the exhaust pipeline downstream of the exhaust unit, and a data collector. The data collector transmits at least radon radioactivity concentration information and aerosol radioactivity concentration information to the control unit. The radon radioactivity concentration is comprehensively monitored by the radon monitoring device, and the aerosol radioactivity concentration in the radioactive waste disposal chamber is monitored by the radioactive aerosol monitoring device, so that the radioactivity concentration of the radioactive substance in the cave can be known in time, and the exhaust unit can be started in time for ventilation when necessary, so as to reduce the radioactivity concentration of the radioactive substance in the cave and the risk of internal exposure radiation of personnel.

The embodiment of the invention relates to the field of substance or object detection, in particular to a small basin sandstone type uranium mine evaluation method. The method comprises the following steps: delineating a uranium-rich rock mass distribution area around the small basin; evaluating uranium source conditions of the uranium-rich rock mass distribution area; the method comprises the following steps: evaluating uranium source conditions around a small basin to shorten exploration time; according to the uranium source condition, the geological environment in the small basin is measured, and an area with the good uranium mineralization condition in the small basin is determined; determining that the region has favorable uranium metallogenic conditions; determining a radon abnormal area of the area; the geological environment of the small basin meeting the uranium source condition is evaluated, and the sandstone type uranium ore of the small basin is further evaluated to determine the uranium metallogenic potential, so that the uranium metallogenic prospective area of the small basin is efficiently predicted, and the prospecting target area is delineated.

The invention discloses a double-layer filtering and double-circulation radon detector. The radon detector comprises a primary filtering and sampling chamber, a delay chamber, a secondary filtering and sampling chamber and a detection assembly which are communicated in sequence, the primary filtering and sampling chamber is used for sampling environmental gas and circulating the environmental gas in the primary filtering and sampling chamber for a preset time to remove non-target daughters in the gas; the delay chamber is connected between the primary filtering and sampling chamber and the secondary filtering and sampling chamber and is used for rectifying the gas without the non-target daughters to form uniform gas flow and supplying the rectified gas into the secondary filtering and sampling chamber in a sampling environment; the secondary filtering and sampling chamber is used for receiving the gas in the delay chamber and capturing a target daughter; the detection assembly is used for detecting alpha decay particles of a target daughter and outputting a detection signal.

A device for measuring radon resistance efficiency of an anti-radon coating relates to the technical field of radioactive contamination protection material testing and comprises a source item side chamber and a protection side chamber which are isolated from each other, a clamping structure used for fixing the anti-radon coating is arranged between the source item side chamber and the protection side chamber, the bottom of the source item side chamber is communicated with a box body, a static radon source is arranged in the box body, and the static radon source is communicated with the protection side chamber. The box body is further connected with a radon source supply system used for dynamically inputting a flow gas type radon source, a valve used for blocking the radon source is arranged in the source item side cavity, a top cover is arranged at the top of the protection side cavity, and the protection side cavity is provided with an air inlet and an air outlet which are used for being communicated with a radon measuring instrument. According to the utility model, the problems of slow concentration establishment and difficult decay compensation caused by dependence on a single radon source in a traditional testing device are solved, the testing efficiency can be greatly improved, radon natural decay and cavity micro-leakage loss can be compensated in real time, the concentration fluctuation of a source item side in a single measurement period is ensured to be in a relatively low range, and the measurement accuracy is improved. And the radon blocking efficiency calculation result is more reliable.

The application discloses a method for detecting a shallow high-temperature area, which comprises the following steps: S1, first, surface exploration is carried out, and then a test grid is arranged and divided; S2, a radon measurement area center point is set, a radon measurement area is set with the radon measurement area center point as a center, and three gas sampling points are selected in the radon measurement area; S3, a radon measurement outer tube is inserted into the gas sampling points and fixed, a gas sampling rod is inserted into the radon measurement outer tube for gas sampling, then the three gas sampling rods are transmitted to a radon measurement instrument for radon value measurement, so that the radon value in the radon measurement area around the radon measurement area center point is obtained; S4, after all the radon measurement areas are measured, radon values are arranged in descending order according to average values; S5, a radon value three-dimensional contour map is drawn by using drawing software, a radon concentration distribution range, a radon concentration distribution form and a radon value anomaly center position are obtained, and finally a downhole high-temperature danger area range is demarcated, and the method has the advantages of reducing errors, data contrast and reference, improving radon value measurement precision and radon measurement efficiency.