30 results about "Radon chamber" patented technology

The invention discloses a method for rapidly measuring radon concentration by zero-order approximation, comprising measurement and calculation. At first, a radon measurement instrument is enabled to work under a scale mode, radon concentration is reversely deduced by using the counting of a long-time 218Po peak in a standardized radon chamber to obtain a scale factor, which is therefore equivalent to an RAD7 radon measurement instrument working under a sniff mode; the radon measurement instrument is then switched to work under a zero-order approximation mode, measurement cycle and cycle times are set, and after the radon measurement instrument is started up, the air outside is subjected to the filtration of radon daughter element by a high-efficiency filter, then continuously pumped into a measurement chamber and discharged to the outside; new daughter element 218Po generated by radon decay in the measurement chamber is adsorbed to the surface of a semiconductor detector under the action of strong electric field, electric signals, which are generated by high energy alpha particles released by the further decay of the 218Po, is subjected to energy identification and then counted to obtain the concentration of the 218Po so as to obtain radon concentration; and the data of radon concentration obtained by measurement is then calculated by applying a specific algorithm, thus the change of radon concentration can be rapidly measured.

A device and method stably regulating and controlling radon progeny state parameters relate to the nuclear science technical field; the device stably regulating and controlling radon progeny state parameters comprises a monodispersion aerosol generation unit, a small volume radon chamber, a source filling regulation and control loop, a radon progeny state parameter regulation and control loop, anda sampling monitoring loop; the sampling monitoring loop can intake a sampling flow rate of the sampling measuring device into a radon chamber total air-exchange flow rate, so the sampling measuringdevice cannot affect the radon progeny state parameters in the radon chamber; the radon progeny state parameter regulation and control loop can continuously and stably regulate and control the radon progeny concentration, radon progeny balance factors and radon progeny uncombined state fraction, thus providing continuous and complete radon progeny parameters for a radon progeny monitor scale calibration test and an artificial radioactivity aerosol monitor radon progeny compensation validity test; the device and method are suitable for field scale calibration tests of the radon progeny monitor.

The invention relates to a randon detector calibrating device and a regulation and control system for keeping concentration stable, and effectively solves the problems that an existing device cannot simultaneously calibrate a plurality of emanometers, and the temperature and the humidity need to be regulated again in each calibration. According to the device, the radon detector calibrating devicecomprises a radon chamber main box body, wherein the radon chamber main box body is fixedly communicated with an exhaust filtering chamber, an intake filtering chamber, a radon source distribution chamber and a temperature and humidity control chamber respectively; the exhaust filtering chamber is filled with activated carbon and is communicated with the outside; the air inlet filtering chamber isfilled with activated carbon and is communicated with the outside; a dehumidification air conditioner, a cooling air conditioner, a heater and a humidification boiler are arranged in the temperatureand humidity regulation and control chamber; the device is simple in structure, convenient to operate, capable of effectively calibrating multiple radon measuring instruments and controlling the temperature and humidity of the radon measuring environment at the same time, and high in practicability.

The invention relates to a control method for the concentration of radioactive gas, in particular to a control method for the radon concentration in multiple radon chambers with one source, which is characterized in that a variable and a control error are taken as a factor for deciding whether radon is supplemented in each radon chamber or not to guarantee that the radon activity in the radon chambers is maintained in the required range after setting the activity value of the radon in the radon chambers and the allowable error and measuring the background activity value in the radon chambers; the supplement of the radon in the radon chambers is guaranteed not to be influenced by the fluctuation of the radioactivity statistics of the radon; the radon activity in the radon chambers is accurately maintained, i.e. the stability of the radon concentration; and the frequent switching of a radon source control valve because of the fluctuation of the radioactivity statistics of the radon is prevented so that the service life of the radon source control valve can be effectively enhanced. Because the integral operation course utilizes the practice as a control factor, the method of the invention has the advantages of easy realization of automation operation and further enhancement of control accuracy.

The invention discloses a measurement cavity for improving positively charged 218Po collection efficiency through an annular electrode and a method. An inner wall of the measurement cavity is a conductive layer, an air outlet pipe and an air inlet pipe are arranged on a wall plate, a semiconductor detector is arranged on an insulation end cover, the first annular electrode is arranged at a lower part of the insulation end cover, a binding post on the first annular electrode penetrates an upper part of the insulation end cover, and the end cover is fixed at an opening end of a cavity; a measurement method comprises the following steps: the air inlet pipe on the cavity is connected with a radon chamber; the semiconductor detector, the conductive layer and the first annular electrode are connected with a high-voltage module through conductor wires, a sampling pump is connected with the air outlet pipe, the sampling pump is started to import the air of a radon chamber, and the radon concentration in the chamber is same as that in the radon chamber. The voltage between the semiconductor detector and the conductive layer is adjusted through the high-voltage module, the 218Po decay counting rate measured by the semiconductor detector is obtained by utilizing a secondary instrument, and then the 218Po decay counting measured through the semiconductor detector is analyzed and computedto obtain the radon concentration by using the secondary instrument.

The invention provides a radon chamber internal local temperature and humidity adjusting device. The adjusting device is characterized by comprising a constant-temperature constant-humidity box body,a cooling device, a heating and refrigerating device, a dryer, a flux adjustable gas pump, a temperature and humidity measuring probe, a temperature and humidity control module and a temperature and humidity displaying module. The heating and refrigerating device is attached to the outer surface of the constant-temperature constant-humidity box body. The cooling device is attached to the outer side of the heating and refrigerating device. The flux adjustable gas pump is connected to the gas inlet of the constant-temperature constant-humidity box body through the dryer. The gas inlet of the flux adjustable gas pump and the gas outlet of the constant-temperature constant-humidity box body are both placed in a radon chamber. The temperature and humidity control module is connected with the flux adjustable gas pump. The temperature and humidity measuring probe is placed in the constant-temperature constant-humidity box body and the radon chamber and connected with the temperature and humidity control module. The temperature and humidity displaying module is connected with the temperature and humidity control module ad displaces the temperature and humidity in the constant-temperature constant-humidity box body and the temperature and humidity in the radon camber and the control states of the temperature and humidity. By means of the technical scheme used by the method, the adjusting device is feasible and convenient to use and can adjust the temperature and humidity of the local area in the radon chamber.

The invention provides a method for discharging waste gas in a radon chamber, and particularly relates to a method for treating the radon waste gas in the radon chamber after instrument calibration is completed in the radon chamber. According to the scheme, after instrument calibration is completed in the radon chamber, the waste gas in the radon chamber is led into another container (gas storage chamber); as the half-life period of radon is 3.82 days, the radon concentration in the gas storage chamber will be lowered after the radon is stored in the gas storage chamber for a period of time; when the radon concentration reaches the concentration stipulated in national discharge stands, the radon in the gas storage chamber is discharged into the atmosphere. According to the method for discharging the waste gas in the radon chamber, the waste gas in the radon chamber can be discharged in a pollution-free mode, and no environmental pollution will be caused while the efficiency of instrument calibration is improved; besides, control in the method is easy and convenient, and automation is easy to implement based on the method.

The invention discloses a method for calibrating an emanometer by using radon dissolved in water. The method comprises the steps of testing a background of a scintillation chamber of the emanometer to be calibrated; connecting a reference emanometer, the scintillation chamber of the emanometer to be calibrated, an air extracting pump and a daughter filter to form a circulating closed system, and testing a radon value background in the circulating closed system; adding an air-blowing bottle filled with a water sample into the circulating closed system, turning on the air extracting pump for testing, and turning off the air extracting pump after circulating bubbling for a preset time at a preset flow in the testing process; clamping inlet and outlet end pipes of the scintillation chamber of the emanometer to be calibrated, standing, keeping the reference emanometer to test, and recording test values according to a preset time interval; and measuring the radon volume activity of the circulating closed system by using the reference emanometer, and taking the radon volume activity as an agreed true value of the radon volume activity calibrated each time after the radon volume activity is subjected to temperature and air pressure correction. The problems of radon chamber scarcity, long calibration period, radon source shortage in solid radon source calibration, serious device aging, frequent faults, difficult transportation, high maintenance technical requirements and the like are solved.

The invention provides a device and a method for quickly measuring an effective diffusion coefficient of radon in a film material through a static collection method. A first cylindrical air inlet chamber and a second cylindrical air inlet chamber in the measuring device are respectively mounted on threaded end covers at two ends of a measuring chamber. An air outlet joint on the measuring chamberis connected with an air inlet end on a radon measuring instrument. An air outlet end on the radon measuring instrument is connected with the air inlet end of a main pump. The air outlet end of the main pump is connected with an air inlet joint on the measuring chamber. An air outlet of a standard radon chamber is connected with the air inlet joint of the first cylindrical air inlet chamber. The air outlet joint of the first cylindrical air inlet chamber is connected with the air inlet end of an auxiliary pump. The air outlet end of the auxiliary pump is connected with the air inlet joint of the second cylindrical air inlet chamber. The air outlet joint of the second cylindrical air inlet chamber is connected with the air inlet of the standard radon chamber. In measurement, film plates abut against two ends of the cylindrical cylinder, and furthermore compression and sealing by a threaded end cover are performed. After measurement, the effective diffusion coefficient of the radon in the thin film material is quickly obtained through calculation.

The invention discloses a method for evaluating plant DNA damage of a radioactive gas radon by using usnea diffracta. The method comprises the following steps: putting usnea diffracta into a radon chamber, extracting cell nucleuses after radon treatment is completed, further performing single cell gel electrophoresis testing, measuring parameters of DNA migration by using a CASP (Critical Assessment of Techniques for Protein Structure Prediction) system, and evaluating DNA damage degrees. By adopting the method, the usnea diffracta is adopted as a plant material for a first time to reflect plant DNA damage; with the combination of methods of mechanical separation and enzyme treatment, cell nucleuses in stems and leaves of plants are separated, then an appropriate number of complete nucleuses are obtained, and the problem that comet assay is hard to apply to the plant field is solved; the Tail length, the relative Tail DNA content, the tail momentum (TM) and the Olive tail momentum (OTM) which can reflect plant DNA damage degrees are confirmed, and relatively rich bases can be made for researching functions of radon to organisms.

A standard radon chamber 222Rn/220Rn mixed concentration automatic constant value measuring system comprises a spherical scintillation chamber, a radon and thorium analyzer, a radon and thorium concentration automatic constant value calibrator and a PC. The radon and thorium concentration automatic constant value calibrator comprises a high-voltage power supply, a low-voltage power supply, a signal amplifier, a single-channel pulse amplitude analyzer and an FPGA signal measuring and processing module. And the PC comprises a background measurement module, a sample measurement module, a data storage module, a self-checking module and a display. The invention discloses an automatic constant value measurement method for 222Rn/220Rn mixed concentration of a standard radon chamber. The automatic constant value measurement method comprises the following steps of: 1, self-checking a counting function of an FPGA (Field Programmable Gate Array) signal measurement processing module; 2, measuring a background counting rate; and 3, measuring the mixed concentration of 222Rn/222Rn. According to the invention, automatic valuing of the 222Rn/220Rn mixed concentration of the standard radon chamber can be realized, so that the calibration process of the radon and thorium concentration measuring instrument is simpler, more convenient and more intelligent, and the problems that a scintillation chamber method for valuing the 222Rn/220Rn mixed concentration of the standard radon chamber at present is low in automation degree, unattended operation is not realized, the 222Rn concentration needs to be manually calculated, and data cannot be automatically stored are solved.

The invention discloses a measurement cavity for improving positively charged 218Po collection efficiency through multi-detector and method. An inner wall of the measurement cavity is a conductive layer, an air outlet pipe and an air inlet pipe are arranged on a wall plate, a plurality of semiconductor detectors is arranged on an insulation end cover in an annular way to form a first annular measurement ring, and the end cover is fixed at an opening end of a cavity; a measurement method comprises the following steps: the air inlet pipe is connected with a radon chamber, the semiconductor detectors are connected with a high-voltage module after being serially connected through a conductor wire, the conductive layer is connected with the high-voltage module through the conductor wire, a sampling pump is connected with the air outlet pipe, the sampling pump is started to import the air of the radon chamber, and the radon concentration in the chamber is same as that in the radon chamber. The voltage between the semiconductor detector and the conductive layer is adjusted through the high-voltage module, the 218Po decay counting rate is obtained by utilizing a secondary instrument, the counting rate is risen along the rise of the voltage, and the adjusting is stopped when the voltage is continuously boosted and the counting rate basically keeps constant. The collection efficiency ofthe 218Po is improved through the method disclosed by the invention, and then the 218Po decay counting is analyzed and computed to obtain the radon concentration by using the secondary instrument.

The invention discloses a standard radon chamber 222Rn concentration automatic constant value measuring system and a method, and relates to the technical field of metering devices. The standard radon chamber 222Rn concentration automatic constant value measuring system comprises a spherical scintillation chamber, a radon and thorium analyzer, a radon concentration automatic constant value calibrator and a PC. The radon concentration automatic constant value calibrator comprises a high-voltage power supply, a low-voltage power supply, a signal amplifier, a single-channel pulse amplitude analyzer and an FPGA signal measuring and processing module. And the PC comprises a self-checking module, a background measurement module, a sample measurement module, a data storage module and a display. A standard radon chamber 222Rn concentration automatic valuing method is applied to the standard radon chamber 222Rn concentration automatic constant value measuring system and comprises the following steps: 1, self-checking a counting function of an FPGA signal measurement processing module; 2, measuring a background counting rate; and 3, measuring the concentration of 222Rn. According to the invention, automatic valuing of the 222Rn concentration of the standard radon chamber can be realized, so that the calibration process of the radon concentration measuring instrument is simpler, more convenient and more intelligent.

The invention discloses a device and a method for measuring the ionization rate of water vapor molecules in air. The measuring device comprises a measuring box, a radon chamber, a pump and a high-pressure module. The measuring box is a rectangular box body, a first joint and a second joint are respectively arranged on two corresponding side walls of the box body, a panel and a bottom plate of the box body are both conductive metal plates, and a circular semiconductor detector is arranged on the panel. A first connector of the measuring box is connected with a first connector of the radon chamber, a second connector of the measuring box is connected with one end of the pump, the other end of the pump is connected with a second connector of the radon chamber, a panel of the measuring box is connected with a cathode of the high-voltage module, and a bottom plate of the measuring box is connected with an anode of the high-voltage module. During measurement, the high-voltage module is turned on, a cylindrical uniform electrostatic field is formed between the detector and the bottom plate, positively charged Po-218 is collected to the surface of the detector, the collection efficiency of the Po-218 under different voltages is obtained, the collision frequency of the Po-218 and OH<-> and the value of the composite probability of the Po-218 and OH<-> are obtained through fitting, and then the ionization rate of water vapor molecules in air is obtained through calculation.

The invention discloses a device and a method for adjusting radon exhalation rate and effective decay constant by using a radon chamber. In the device, one end of a filter membrane is connected with a measuring chamber of a measuring instrument through a pipeline, the other end of the filter membrane is connected with a drying pipe through a pipeline, the other end of the drying pipe is connected with a radon collecting cover through a pipeline, and one end of a pump is connected with the measuring chamber of the measuring instrument through a pipeline; the other end of the pump is connected with the radon collecting cover through a pipeline, the gas outlet connector and the gas inlet connector are respectively installed on the compact material plate, the gas outlet connector is connected with the adjustable micro pump through a pipeline, the other end of the adjustable micro pump is connected with the flow meter through a pipeline, and the other end of the flow meter is connected with the radon chamber through a pipeline; the other end of the radon chamber is connected with the gas inlet connector through a pipeline. The measurement method comprises a conventional radon exhalation rate measurement process and a process of adjusting the radon exhalation rate and the effective decay constant of the radon exhalation rate standard device by using the radon chamber. Therefore, the radon exhalation rate and the effective decay constant can be adjusted by adjusting the flow rate of the adjustable micro pump in the device.

A continuous detection system for radon concentration in rooms around the radon chamber. This system uses Zigbee wireless network technology to realize the communication between multiple RAD7 radon detectors and the host computer; the system uses c# language to write the host computer software, and the Access database records and saves historical data. . Compared with other wireless network technologies, zigbec has the characteristics of short distance, low complexity, low power consumption, low data rate, and low cost, and can be well applied to the continuous detection of radon concentration in rooms around radon chambers. A new method is provided for accurately assessing the working effective dose of radon detector testers.