KR101981650B1 - Real-Time Radon Monitoring System for Underground Watershed - Google Patents

Abstract

The present invention relates to a radon monitoring system capable of reducing installation and measurement expenses. According to the present invention, the radon monitoring system comprises: an underground tube well with a cover sealing and coupled to the top; a supply line supplying intake air to a groundwater level; a discharge line discharging discharge air which is mixed with evaporated radon evaporated together with the intake air supplied by the supply line; a conductivity, temperature, depth (CTD) unit measuring the electric conductivity, the water temperature, and the depth of water; a first measurer disposed on the ground to measure the radon contained in the intake air in the supply line; and a second measurer measuring the radon contained in the discharge air of the discharge line.

Description

[0001] The present invention relates to a radon monitoring system for underground water,

The present invention relates to a radon monitoring apparatus, and more particularly, to a radar monitoring apparatus capable of reducing installation and measurement costs through a minimum of components, capable of real-time monitoring of a total amount of actual radon contained in groundwater, The present invention relates to a real-time monitoring apparatus for a radon in a groundwater canal, which can more accurately measure the radon content contained in a certain depth from the surface of the ground regardless of the descent.

In general, radon (Rn) is a gaseous substance produced in the collapse sequence of uranium and thorium. It is colorless and odorless. It is inactive and has a high mobility and is heavier than air.

Namely, radon existing in the natural world is composed of Rn-222 (a half-life of 3.82), which is generated in the U-238 decay series, the Th-232 decay series and the U-235 decay series, (Half-life of 55.6 sec) and Rn-219 (half-life of 3.96 sec), all of which are radon isotopes of atomic number 86. Depending on the purpose, Rn-222 with the longest half-life is called radon, Rn-220 is called thoron, and Rn-219 is called actinon. In the following description, it is assumed that Rn-222 is used for radon and Rn-220 is used for discussion.

In the following description, the detection and the measurement are the same meaning, and it is selectively used in accordance with the context.

The Earth's crust has 2-4 ppm of uranium, 2.6 ppm of uranium on average, and uranium 238, 99.3% of total uranium, has a half-life of 4.5 billion years. Uranium 238 is naturally decayed by this half-life and changes to a safe lead 206.

This natural decay series includes radionuclides such as radium 226, which is the parent species of radon 222, and proton nuclear species, polonium 218, polonium 214, lead 214, and bismuth 214.

In addition, since the half-life is as short as 55.6 seconds in the discussion, the fact that the discussion is measured means that there is a maternal species Ra-224 in the substance to be measured. Therefore, simultaneous measurement of radon and discussion in springs or groundwater can be used to obtain the information of their parent species, Ra-226 and Ra-224, have. (See Figure 1)

Underground radon is heavier than air but has the tendency to rise to the surface. Using these characteristics of radon, it can solve various geological problems such as uranium, geothermal and oil resource exploration, active fault detection, earthquake and volcanic eruption prediction It is used as an important indicator (tracer).

The radon rises toward the surface through interstices (faults, geological structure lines) depending on crustal movements and crustal movements, and is naturally highly detected in strata containing high uranium.

In order to investigate the radon content of the crust, the groundwater and groundwater are widely used. In the groundwater radon survey, 1) groundwater samples were taken from bore holes and analyzed by LSC (liquid scintillation counter) (2) A method of analyzing groundwater radar gas evacuated from groundwater using alpha cups in a well (borehole and synonym) (system and method for measuring radon gas for earthquake forecasting: Korean Patent Registration No. 10-0952657; 2010 . 04. 06.). (Note: While these methods are one-off measurements, this technique is a real-time continuous measurement.)

Therefore, in the case of the discussion, the discussion on the soil gas is measured by inserting the probe into the soil layer and transferring the soil gas to the measuring device. However, the analysis of the discussion in the spring water or groundwater or the pore water can not be performed because of the short half- It is hard to find.

The analysis of radon content in groundwater gauges using water solubility, which is a characteristic of radon dissolving in water, can be used to predict geologically underground resources (uranium, geothermal, petroleum) exploration and geological disasters (active faults, earthquakes, volcanic eruptions) useful.

In other words, radon is the second cause of lung cancer, which is equal to smoking, and especially, it can damage the lungs by the radon in the indoor air, and the radon steadily flows into the indoor space by the ground, soil gas, building material, There is a problem that it can be distributed in any space on the earth.

Although the problem of radon radioactivity is serious, it is difficult to find a system for measuring radon in a systematic way globally, and it relies only on a device for measuring radon concentration sporadically.

In other words, there is a need for a technique that can accurately measure the concentration of radon that is discharged with air diluted in groundwater by continuously supplying air to the closed top of the groundwater irrigation regardless of the rise / fall of the groundwater.

Patent Document 1 is a device for measuring radon flux radiated to the surface of the ground by using an apparatus for measuring radon in an underground borehole, and is a device for measuring the radon diffusion rate and measuring a radon concentration generated and moved on the wall surface of an underground space It is possible to accurately measure the radon concentration, flux and divergence ratio in each case, and to provide a system for efficiently evaluating the risk of radon by integrating the above-mentioned measuring device, so that the radon concentration can be systematically and overall The radon measuring device and the radon risk assessment system capable of analyzing the factors of the risk of radon as well as evaluating the radon are also disclosed. However, there is a disadvantage of measuring only the radon that has already vaporized in the space inside the chamber.

Also, Patent Document 2 can monitor the radon content in the groundwater borehole in real time automatically and continuously at a remote place, and can avoid the conventional daily sampling and complicated analysis, and the automatic level gauge and the water pressure gauge can be installed simultaneously , It is possible to collect valuable earthquake prediction data, and even if the indoor air radon measuring instrument has low sensitivity, sufficient monitoring is possible, but it is possible to measure by filling the chamber with radon.

KR 10-0477010 B1 KR 10-1040070 B1

In order to solve the above-mentioned problems, the present invention relates to a method of controlling a vertical structure such as a closed groundwater well, air supply and discharge line, CTD (Conductivity, Temperature, Depth, Measuring equipment is used to collect data on marine environments and ecosystems, etc. Measuring conductivity to determine salinity, measuring pressure to determine depth), minimizing installation and measurement costs through a minimum number of components, including a meter It is possible to monitor in real time the total amount of actual radon contained in the groundwater by calculating through two measuring instruments and to construct the supply line to be able to extend and retract so that the radon content contained at a certain depth from the groundwater surface regardless of the rise / And to provide a real-time radon monitoring device for a groundwater well, which can measure the groundwater temperature more accurately.

According to an aspect of the present invention, there is provided a groundwater treatment system comprising: a groundwater well having a cover hermetically coupled to an upper end; A supply line connected to the cover to the groundwater level of the groundwater channel through a through connection to supply the suction air on the groundwater; A discharge line communicating with the cover and discharging discharge air mixed with radon vaporized together with the intake air supplied by the supply line; A first measuring device provided on the ground to measure radon of the intake air of the supply line and a second measuring device measuring the radon in the discharge air of the discharge line.

The supply line may include a first line connected from the first measuring device to the cover; A buoy floating above the groundwater; A second line made of a flexible tube so as to be flexible and adjustable in length, the first line being connected to the cover, the second line being connected to the buoy, And a third line connected to the second line connected to the buoy and extending to the buoy at a lower end with a predetermined length of the straight line.

The first measurement device measures the radon of the intake air while supplying the intake air filtered by the first measurement device through the supply line between the first measurement device and the second measurement device, And a calculation output unit for monitoring in real time the total amount of radon in the groundwater well by calculating an amount of discharge of the radon in the exhaust air through the calculation of subtracting the suction amount from the discharge amount.

By providing the present invention thus configured, it is possible to reduce installation and measurement costs through a minimum number of components, to monitor in real time the total amount of actual radon contained in the groundwater, and to correlate the rise / It is possible to more accurately measure the radon content contained in a certain depth from the surface of the groundwater.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an installation state of a radon real-time monitoring apparatus according to the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can readily implement the present invention.

As shown in FIG. 1, the groundwater canal 100 of the present invention is preferentially provided.

The groundwater well 100 is installed vertically through the pipe to be recharged from the ground to the underground. The groundwater well 100 is hermetically coupled to the upper end and is provided with a cover 110 that can be opened and closed.

A plurality of connection holes are formed in the cover 110, and wiring lines for installing the supply line 200, the discharge line 300, and the CTD 600 are connected to the connection holes, respectively.

The supply line 200 may be connected to the cover 110 through a connection to the groundwater level W of the groundwater well 100 to supply air to the groundwater W. [

At this time, a first measuring device 400 for measuring the radon may be provided on the ground connected to the supply line 200 in the intake air of the supply line 200.

In addition, a drying unit (DU) is further provided on the inlet side of the first measuring device (400) and the inlet side of the discharge line (300), respectively, to remove moisture to accurately measure the content of radon in the air .

The discharge line 300 may be connected to a connection hole of the cover 110 for discharging exhaust air mixed with radon vaporized together with the intake air supplied by the supply line 200.

At this time, a second measuring instrument 500 for measuring radon may be provided on the ground connected to the discharge line 300, in the discharge air of the discharge line 300.

In other words, the first measuring instrument 400 measures the outside air radon and introduces the drawn-in air into the groundwater well 100 along the supply line 200, and the second measuring instrument 500 is connected to the groundwater well 100, The radon is vaporized and discharged along the discharge line 300, and the radon is measured and discharged to the atmosphere.

Meanwhile, the CTD 600 may be connected to the bottom of the groundwater well 100 through a through connection to the cover 110 to measure electrical conductivity, water temperature, and water depth.

The CTD 600 is disposed at the depth of the groundwater (W), and is used to collect data such as a few ecosystems of the groundwater (W) environment by measuring the temperature and the electric conductivity. Pressure and so on to measure the groundwater level (W) environment.

In other words, CTD (600) is to calculate the distribution value of radon dissolved in groundwater to the air layer in the canopy by measuring depth and temperature. In order to measure the volume of the air layer in the canopy according to the water depth, the groundwater radon concentration change at a certain depth in the canopy is calculated using Rin (radon concentration in the supplied air), Rout (radon concentration in the exhaust air) To monitor data in real time.

The supply line 200 is disposed adjacent to the surface layer of the groundwater W so that the end of the supply line 200 to which the suction air is discharged is positioned adjacent to the surface layer of the groundwater W so that the radon can be accurately measured. It is desirable to always be maintained at a position where

Therefore, the buoy 240 is required to always be positioned at the same surface layer position.

That is, the supply line 200 is provided with a buoy 240 floating on the groundwater W,

The first line 210 is connected from the first measuring instrument 400 to the cover 110.

The second line 220 is connected to the buoy 240 from the first line 210 connected to the cover 110 so that the buoy 240 can be flexibly adjusted in length. And a third line 230 extending at a lower end of the buoy 240 with a predetermined length of the straight line.

That is, the supply line 200 is connected to the first line 210, the second line 220, and the third line 230 in order and is supplied through the first measuring device 400 The intake air sequentially moves along the first line 210, the second line 220 and the third line 230 of the supply line 200 and flows through the end of the third line 230 to the groundwater W As shown in Fig.

The third line 230 may further include an air stone 250 for generating fine bubbles by discharging sucked air supplied along the supply line 200 to groundwater.

That is, by providing the air stone 250 at the end of the third line 230, fine bubbles are generated in the surface layer of the groundwater W so that the radon dissolved in the groundwater W is mixed with the intake air So that the upper space of the groundwater well 100 is easily vaporized.

The installation depth of the CTD 600 is preferably located at a depth of 5 m from the air stone 250.

On the inner wall of the groundwater well 100, a guide rail 120 for guiding the lifting and lowering of the buoy 240 along the longitudinal direction of the groundwater well 100 is provided, .

Therefore, the buoy 240 can be raised or lowered according to the height of the groundwater W accommodated in the groundwater well 100, and can be prevented from flowing left / right by the swirling of the groundwater W, The raising and lowering can be guided by the rails 120.

Lastly, the total amount of radon R of the groundwater well 100 is calculated in real time by subtracting the suction amount Rin from the discharge amount Rout between the first measuring device 400 and the second measuring device 500 And an operation output unit 700 for monitoring the operation.

At this time, while the intake air filtered by the first measuring instrument 400 is supplied through the supply line 200, the intake air amount is determined as the intake amount Rin of the intake air measured by the second measuring instrument 500 (Rout), which is a result of measuring the radon of the exhaust air through the exhaust line 300,

The total amount of radon R in the groundwater well 100 by the calculation output unit 700 is a value that subtracts the suction amount Rin from the emission amount Rout.

Thus, the method of calculating the radon concentration in the groundwater well 100

K is a constant value calculated using temperature, electric conductivity, and depth of water (change in the air volume of the reservoir), and k is a constant value depending on rainfall, anthropogenic water, The suction line supplied from the measuring instrument 400 is used as a flexible tube material for the supply line 200.

The buoy 240 is located in a portion of the supply line 200 and is maintained at a constant level along the groundwater W. The buoy 240 is connected to the third line 230 with flow and leveling within the groundwater well 100, It is preferable that the air stone 250 is vertically fixed at a position of 5 m from the water surface of the groundwater W and has an end at the end.

On the other hand, using the apparatus of the present invention, the radon concentration in the ground water is remotely supplied to the groundwater tank 100 every thirty minutes for about 3 months, and received in the laboratory to investigate and predict the influence of the weather change such as rainfall, temperature, Can be utilized.

By providing the present invention thus configured, it is possible to reduce installation and measurement costs through a minimum number of components, to monitor in real time the total amount of actual radon contained in the groundwater, and to correlate the rise / It is possible to more accurately measure the radon content contained in a certain depth from the surface of the groundwater.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms. It should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configurations shown in the drawings and the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, It should be understood that various equivalents and modifications are possible.

100: groundwater observation
110: cover
120: guide rail
200: Supply line
210: First line
220: second line
230: Line 3
240: Buoy
250: Air Stone
300: discharge line
400: first measuring instrument
500: Second measuring instrument
600: CTD
700: Operation output unit
Rin: Inhalation dose
Rout: Emissions
R: Total amount
W: Groundwater level
DU: Driving unit

Claims (5)

A groundwater well (100) having a cover (110) hermetically coupled to the top;
A supply line 200 connected to the cover 110 through a penetration connection to the groundwater W of the groundwater well 100 to supply air to the groundwater W;
A discharge line 300 for discharging the exhaust air mixed with the radon which is piped to the cover 110 and is vaporized together with the intake air supplied by the supply line 200;
A first measuring device 400 provided on the ground to measure radon in the intake air of the supply line 200 and a second measuring device 500 measuring radon in the exhaust air of the discharge line,
The supply line (200)
A first line 210 connected from the first measuring instrument 400 to the cover 110;
A buoy 240 floating on the groundwater W;
A second line 220 formed of a soft tube so as to be flexible and adjustable in length, the first line 210 connected to the cover 110 and the buoy 240 connected to the second line 220;
And a third line 230 connected to the second line 220 connected to the buoy 240 and extending at a lower end of the buoy 240 with a predetermined length straight pipe,
A guide rail 120 is installed on the inner wall of the groundwater well 100 to prevent the buoy 240 from flowing to the left and right and to guide the buoy 240 up and down along the longitudinal direction of the groundwater well 100. Further comprising: a radon monitoring device for detecting groundwater flow in the groundwater channel.
delete The method according to claim 1,
At the end of the third line 230,
Further comprising an air stone (250) for generating fine bubbles discharged from the groundwater to the intake air supplied along the supply line (200).
delete The method according to claim 1,
Between the first measuring instrument 400 and the second measuring instrument 500,
The intake air filtered by the first measuring instrument 400 is supplied through the supply line 200 and the intake amount Rin of the intake air is measured,
The second measuring instrument 500 measures the radon of the discharge air through the discharge line 300 as the measured discharge amount Rout
Further comprising a calculation output unit (700) for monitoring in real time the total amount of radon (R) of the groundwater well (100) by subtracting the suction amount (Rin) from the discharge amount (Rout) Radon real time monitoring device.

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