KR101514251B1 - Adsorption area of radon measurement equipment and measuring method using the same - Google Patents

Adsorption area of radon measurement equipment and measuring method using the same Download PDF

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Publication number
KR101514251B1
KR101514251B1 KR1020140054247A KR20140054247A KR101514251B1 KR 101514251 B1 KR101514251 B1 KR 101514251B1 KR 1020140054247 A KR1020140054247 A KR 1020140054247A KR 20140054247 A KR20140054247 A KR 20140054247A KR 101514251 B1 KR101514251 B1 KR 101514251B1
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South Korea
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radon
chamber
gas
image screen
source
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KR1020140054247A
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Korean (ko)
Inventor
김병주
이종만
김병철
이경범
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한국표준과학연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/40—Concentrating samples
    • G01N1/405—Concentrating samples by adsorption or absorption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/061—Sources
    • G01N2201/06113—Coherent sources; lasers

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Measurement Of Radiation (AREA)

Abstract

The present invention relates to an apparatus for measuring the amount of radon and a method for measuring the area of adsorption of radon using the apparatus, the apparatus comprising: a radon source for supplying radon gas; a radon source connected to the radon source; A radon chamber in which a donut is introduced, a closure detachably connected to one end of the radon chamber and sealing the inside of the radon chamber when the closure is coupled, and a sealing member mounted on one side of the closure, And an image screen that is exposed to light by an infrared light source.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a radon adsorption area measuring apparatus,

The present invention relates to a device for measuring the adsorption area of radon and a method for measuring the adsorption area of the radon using the device.

When uranium and thorium, which are naturally present in rocks and soils, collapse continuously, they become radium. Radon is a radioactive inert gas produced by the collapse of the radium. Radon is a colorless, tasteless, odorless radioactive gas that is one of the heaviest gases. It is contained in a small amount in air or natural water, adsorbed in uranium minerals, and dissolved in mineral springs, hot springs and ground water.

Radon is an inert gas that reacts with fluorine or chlorine, which is chemically inert but has a high electronegativity, to produce compounds such as radon fluoride (RnF2). Dissolve 230 cm3 / L (20 ℃) in water and dissolve more in organic solvent. Radiation emitted from natural radon does not affect the human body, but if radon is accumulated in an enclosed space such as a mine or underground, it is highly likely to be inhaled by humans. It is known that when inhaled by humans, radon causes lung cancer in the body.

Due to the risk of indoor radon, there is a growing need for an infrastructure that can easily and accurately measure living space radon. In addition, the reliability of the radon measuring method and the measuring instrument should be secured, and such reliability can be secured by introducing the apparatus for measuring the adsorption area of the radon.

However, the conventional radon adsorption area measuring apparatus has a disadvantage in that it can not measure the adsorption homogeneity of radon because the adsorption area of the radon is measured using a pin hole camera. In addition, the measurement using the pinhole camera has a disadvantage of requiring a long time to obtain the image.

It is an object of the present invention to provide an equipment for measuring the adsorption area of radon which can accurately and quickly measure the adsorption area and homogeneity of adsorption and a method for measuring the same.

According to an aspect of the present invention, there is provided an apparatus for measuring an adsorption area of a radon, the apparatus comprising: a radon source for supplying a lardon; A radon chamber connected to the radon source, the radon chamber being supplied with radon gas supplied from the radon source; A closure detachably coupled to one end of the radon chamber and sealing the inside of the radon chamber when the radon chamber is coupled; And an image screen mounted on one side of the enclosure and exposed to light by the alpha particles of radon solidified within the radon chamber.

According to one embodiment of the present invention, the sealing portion includes: a coupling portion coupled to one end of the radon chamber; And a screen mounting member disposed adjacent to the coupling portion and to which the image screen is attached; And a moving unit which is movably connected through the coupling unit and is movable up and down at a position adjacent to the coupling unit so that the image screen is brought into close contact with the solidified radon.

According to another embodiment of the present invention, a buffer chamber connected to the radon source and separating the lardon gas supplied from the radon source from the other gas may be included.

Herein, the apparatus for measuring the adsorption area of radon may include a vacuum chamber connected to the radon chamber and for evacuating the radon chamber to a vacuum state so that the deposit is reduced to the bottom of the radon chamber of the radon gas introduced into the radon chamber .

According to another aspect of the present invention, there is provided an image display apparatus comprising: a radon chamber; Evacuating gas inside the radon chamber such that the interior of the enclosed radon chamber forms a vacuum state; Cooling the adsorption member disposed at one end of the radon chamber to freeze the radon gas introduced into the radon chamber; Injecting radon gas from the radon source into the radon chamber; And the image screen disposed at the other end of the radon chamber is sensitized by alpha particles of radon adsorbed to the adsorbent member.

According to one embodiment of the present invention, between the step of cooling the adsorption member and the step of injecting the radon gas, the radon gas is introduced into the radon chamber so as to reduce impurities other than the radon gas in the gas injected into the radon chamber. And separating it from the other gas.

According to another embodiment of the present invention, the method may further include the step of irradiating the image screen with a laser so that light is emitted from the photosensitive portion of the photosensitive screen.

The method may further include measuring light radiated from the image screen to measure an absorption area of the radon.

According to the present invention as described above, the adsorption area and the adsorption homogeneity of the radon gas can be measured by sensitizing through the image screen and irradiating the laser on the image screen.

Also, according to at least one embodiment of the present invention, accuracy of radon absorption radius and homogeneity measurement can be increased.

Further, according to at least one embodiment of the present invention, more accurate and accurate calibration projects and equipment can be made available.

1 is a conceptual diagram of an apparatus for measuring an adsorption area of radon according to an embodiment of the present invention.
2 is a perspective view of a seal according to an embodiment of the present invention;
3 is a perspective view showing a state in which the moving part of the closing part shown in FIG. 2 is lowered and the screen mounting member is moved away from the engaging part;
4 is a flow chart showing steps of a method for measuring the adsorption area of radon of the present invention.
FIG. 5 is a conceptual diagram illustrating a process in which blue light is emitted from a screen on which radon is adsorbed by the apparatus for measuring the adsorption area of radon.
FIG. 6 is a conceptual diagram showing a step of measuring the radius of radon absorption and the homogeneity of the radon using the apparatus for measuring the adsorption area of the radon shown in FIG.

Hereinafter, a radon adsorption area measuring apparatus and a radon adsorption area measuring method according to the present invention will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

1 is a conceptual diagram of an apparatus 100 for measuring an adsorption area of radon according to an embodiment of the present invention.

The apparatus 100 for measuring the adsorption area of radon according to the present invention includes a radon source 110, an enclosure 120, a radon chamber 130, a buffer chamber 140, and a vacuum 150. The radon source 110, the buffer chamber 140, the radon chamber 130, and the vacuum 150 are connected to each other through a pipe 160, and the pipe 160 is opened or closed Which are connected to valves 171, 172 and 173, respectively.

The radon source 110 is a device for supplying radon to the radon chamber 130. The radon source 110 may be supplied to the radon chamber 130 through the buffer chamber 140. This is to remove scum mixed with the radon gas. This will be described in detail later. The radon source 110 may be connected to the buffer chamber 140 using a stainless steel clean tube. In addition, the radon source 110 can utilize the radon source 110 of the RN-1205 model, which generates radon using a solid type Ra-226 of Pylon powder type.

The radon chamber 130 receives the radon gas and adsorbs the radon gas to the lower portion of the radon chamber 130. A suction member (not shown) may be mounted on the bottom of the radon chamber 130. The adsorption member is cooled through a nickel rod 121 called a cold finger provided below the radon chamber 130. The radon gas is solidified and adsorbed on the cooled adsorption member. The image screen 132 provided in the enclosure 120 may be moved downward and be exposed to light by the solidified radon. This will be described in detail later.

Also, the radon chamber 130 may be fabricated for UHV (Ultra High Vacuum). This can reduce out gasing from the inner wall of the radon chamber 130.

Closure 120 is disposed above the radon chamber 130. The sealing part 120 is coupled with the upper part of the radon chamber 130 to seal the inside of the radon chamber 130. As described above, when the radon gas is solidified in the radon chamber 130, the moving part provided in the closing part 120 moves downward, and the image screen 132 (see FIG. 2) Can be sensitized.

A buffer chamber 140 is disposed between the radon source 110 and the radon chamber 130. The buffer chamber 140 can be formed to enable alpha particle counting in a high vacuum state. A gas clean filter may be installed in the radon chamber 130 to reduce the inflow of gases other than the radon gas as much as possible.

The vacuum chamber 150 is a device for vacuuming the radon chamber 130. The vacuum chamber 150 can exhaust the gas inside the radon chamber 130 through a pipe. This is to prevent mixing of other gases into the radon chamber 130 and facilitate introduction of the radon gas into the radon chamber 130 from the buffer chamber 140.

The vacuum 150 may be a turbo molecular pump (TMP). In addition, the vacuum 150 can be a Turbovac 151 Turbo Molecluar Pump from Leybold and an ISP-90 Scroll Pump.

FIG. 2 is a perspective view illustrating a sealing part 120 according to an embodiment of the present invention.

The sealing portion 120 according to an embodiment of the present invention includes a coupling portion 131, a screen attachment member 133, a moving portion, and a movement length measuring member 139.

The coupling portion 131 is engaged with the upper end of the radon chamber 130. The coupling portion 131 may be coupled to the upper end of the radon chamber 130 with bolts and nuts. The inside of the radon chamber 130 may be sealed when the coupling is performed. Further, the engaging member 131, on which the engaging part 131 is disposed, may be formed in a circular plate shape.

The screen attachment member 133 is a disk-shaped disk having a circular shape and located at the lower portion of the moving unit described later. The screen attachment member 133 may be affixed with an image screen 132 that can be sensitized by the alpha particles of radon. Further, the screen attachment member 133 is connected to a moving unit described later, and is moved up and down as the moving unit moves up and down. The screen mounting member 133 can be moved to the bottom plate of the lower end of the radon chamber 130.

The moving part includes an intermediate supporting member 134, an upper moving member 135, a connecting member 136, and an upper supporting member 137.

The connecting member 136 is a bar-shaped member for connecting the screen mounting member 133 and an upper movable member 135 to be described later. The connection member 136 is formed through the coupling member 131. When the upper movable member 135 is moved up and down, the connecting member 136 is moved up and down so that the screen attaching member 133 is moved up and down.

The intermediate support member 134 is a member that serves as a guide and a support when the upper movable member 135 is fitted and moved up and down. The intermediate support member 134 is formed to extend from the upper support member 137 to the engagement member 131, which will be described later. The intermediate support member 134 may be formed of two or more pieces.

The upper moving member 135 is a member connected to the connecting member 136. The upper movable member 135 is fitted to the intermediate support member 134 and is movable up and down. An operator or a user using the apparatus 100 for measuring the adsorption area of radon may move the upper moving member 135 up and down to bring the image screen 132 into contact with the adsorption member.

The upper support member 137 is spaced apart from the engaging member 131. The upper support member 137 is disposed on the upper side of the intermediate support member 134. The upper support member 137 is disposed at one end of the intermediate support member 134 and the engagement member 131 is disposed at the other end. The upper moving member 135 is formed to prevent the upper moving member 135 from rising above a predetermined height. In addition, the upper moving member 135 may serve to support one end of the stem portion 138, which will be described later.

The moving length measuring member 139 includes a stem portion 138 and a measuring member 139.

The stem portions 138 are formed with graduations displayed at regular intervals. The stringer portion 138 is formed to extend from the supporting member to the engaging member 131. The stem portion 138 is formed so that the measuring member 139 (to be described later) can detect the depth of the screen attachment member 133.

The measuring member 139 is formed on one side of the upper movable member 135. Therefore, when the upper moving member 135 is moved, the measuring member 139 is also moved together. The measuring member 139 may be formed in an arrow shape indicating a scale of the stringer portion 138. Accordingly, the position of the measurement unit pointing to the tubular portion 138 is changed according to the movement of the upper moving member 135, so that the screen mounting member 133 is moved to a certain depth in the radon chamber 130 As shown in FIG.

3 is a perspective view showing a state in which the moving part of the closing part 120 shown in FIG. 2 is lowered and the screen mounting member is moved away from the coupling part 131. FIG.

Referring to FIG. 3, it can be seen that the moving part is lowered as compared with FIG. The upper movable member 135 has moved downward. Thus, the position of the measurement member 139 indicated by the string portion 138 has changed. The user can recognize the depth of the screen attachment member 133 by reading the string portion 138.

The screen mounting member 133 is located inside the radon chamber 130 by covering the radon chamber 130 with the sealing portion 120. And the screen attachment member 133 is disposed downward to the radon absorption portion of the radon chamber 130 by being lowered. As described above, when the screen attaching member 133 is disposed close to the radon attracting portion, a screen attached to the screen attaching member 133 by the alpha particles emitted from the radon adsorbed on the radon attracting portion, Can be sensitized.

4 is a view showing steps of a method of measuring an adsorption area of radon of the present invention.

The method for measuring the adsorption area of radon according to the present invention comprises the steps of preparing an image screen 132 which is sensitized by alpha particles of radon in the radon chamber 130, Cooling the adsorption member disposed at one end of the radon chamber 130 in order to freeze the radon gas introduced into the radon chamber 130, , Injecting radon gas from the radon source (110) into the radon chamber (130), and injecting radon gas into the radon chamber (130), wherein the image screen (132) And is exposed to light by the particles.

The step of preparing the image screen 132, which is exposed by the alpha particles of radon, inside the radon chamber 130 is the step of attaching the image screen 132 to the screen attachment member 133. At this time, the image screen 132 may be attached in a state where the closure 120 is separated from the radon chamber 130.

The step of evacuating the gas inside the radon chamber 130 such that the inside of the sealed radon chamber 130 is in a vacuum state is performed by using the vacuum 150 to exhaust the gas inside the radon chamber 130 . This prevents impurities from being generated due to the presence of other gases in the radon chamber 130 and may help the radon gas from the buffer chamber 140 to be introduced into the radon chamber 130.

The step of cooling the adsorption member disposed at one end of the radon chamber 130 to freeze the radon gas introduced into the radon chamber 130 may include cooling the radon chamber 130 using the nickel rod 121 The adsorbing member disposed at the lower end of the adsorbing member 130 is allowed to freeze. The radon gas introduced into the radon chamber 130 can be frozen and solidified, and then can be exposed to light using the image screen 132.

The step of injecting radon gas from the radon source 110 into the radon chamber 130 is a step of injecting radon gas from the radon source 110 into the radon chamber 130. At this time, it may further include separating the radon gas from the other gas so as to reduce impurities other than the radon gas in the gas injected into the radon chamber 130. This is possible using the buffer chamber 140. Specifically, a method of solidifying the radon gas through cooling in the buffer chamber 140, discharging other gases out of the buffer chamber 140, and then raising the temperature inside the buffer chamber 140 to vaporize the solidified radon have.

And then the image screen 132 disposed at the other end of the radon chamber 130 is exposed to light by the alpha particles of the radon adsorbed on the adsorption member. In this step, the image screen is exposed for about 5 to 10 minutes. Through the photosensitivity, it is possible to measure the adsorption homogeneity of the radon adsorbed on the adsorption member by the laser on the image screen 132 later.

The method may further include illuminating the image screen 132 with a laser so that light is emitted from the photosensitized portion of the photosensitized image screen 132.

Further, the method may further include the step of measuring the area of adsorption of radon by sensing light emitted from the image screen 132 to which the laser is irradiated.

FIG. 5 is a conceptual diagram illustrating a process in which light is emitted from a screen onto which radon is adsorbed through the apparatus 100 for measuring the adsorption area of the radon.

The image screen 132, which is sensitized by the alpha particles of radon, can be scanned using the Cyclone Storage Phosphor System. The screen of the Cyclone Storage Phosphor System has a BaFbr: Eu2 + crystal coated on its surface. The alpha or beta energy from the radioactive isotope ionizes the Eu2 + of the screen to Eu3 +, creating free electrons (step a). The free electrons are trapped in the holes of the Bromine. When the free electrons confined in the hole are irradiated with a red laser beam having a wavelength of 633 nm, the Eu3 + state is changed to an unstable Eu3 + state (step b). The unstable Eu < 3 + > state can be stabilized with blue light of a wavelength of 390 nm. The radon absorption radius can be measured by measuring the emitted light having a wavelength of 390 nm (step c).

FIG. 6 is a conceptual diagram showing a step of adsorbing radon on a screen using the apparatus 100 for measuring the adsorption area of radon shown in FIG.

(a) introduces the radon gas into the buffer chamber 140, which is cooled from the radon source 110. Inside the cooled buffer chamber 140, the radon gas solidifies, and other gases can be released to the outside.

In step (b), the radon chamber 130 is vacuumed using the vacuum 150. Thereafter, the nickel rod 121 is used to cool the adsorption member. Thereafter, the buffer chamber 140 is heated to transfer the radon gas in the buffer chamber 140 to the radon chamber 130.

and in step (c), alpha particles emitted from the radon adsorbed on the adsorption member can be detected. At this time, the moving part provided in the closing part 120 may be moved downward to operate the screen so as to touch the adsorption member. And photosensitizing alpha particles from the radon adsorbed on the screen.

The step (d) gasifies the radon adsorbed to the adsorbent while heating the radon chamber 130 after the end of the photosensitization. Then, the buffer chamber 140 is cooled and the radon gas is transferred to the buffer chamber 140 again. Through this process, the radon gas in the radon chamber 130 can be eliminated.

After the radon gas in the radon chamber 130 is removed, the closure 120 can be separated from the radon chamber 130 and the screen can be removed. The removed screen can be inserted into the Cyclone Storage Phosphor System and scanned as described above. The radius of the radon adsorbed on the adsorption member can be measured through the scanning.

The radon adsorption area measuring method and the radon adsorption area measuring method described above are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or part of the embodiments Or may be selectively combined.

100: Radon adsorption area measuring instrument 110: Radon source
120: sealing part 121: nickel rod
130: Radon chamber 131: Coupling part
131-1: coupling member 132: image screen
133: Screen attachment member 134: Intermediate support member
135: upper movable member 136: connecting member
137: upper support member 138:
139: measuring member 140: buffer chamber
141: Dewar flask 150:
160: piping 171, 172, 173: valve

Claims (8)

A radon source to supply lardon;
A radon chamber connected to the radon source, the radon chamber being supplied with radon gas supplied from the radon source;
A closure detachably coupled to one end of the radon chamber and sealing the inside of the radon chamber when the radon chamber is coupled; And
An image screen mounted on one side of the enclosure and exposed to light by the alpha particles of radon solidified within the radon chamber,
The sealing portion
A coupling unit coupled to one end of the radon chamber; And
A screen mounting member disposed adjacent to the coupling portion and to which the image screen is attached;
And a moving part which is movably connected through the coupling part and is movable up and down at a position adjacent to the coupling part so that the image screen adheres to the solidified radon. Adsorption area measurement equipment. delete The method according to claim 1,
And a buffer chamber connected to the radon source and separating the lardon gas supplied from the radon source from the other gas. The method of claim 3,
And an evacuation unit connected to the radon chamber and configured to evacuate the radon chamber to reduce the deposition of the radon gas to the bottom of the radon chamber of the radon gas introduced into the radon chamber. A method for measuring the adsorption area of radon using the equipment according to any one of claims 1, 3, and 4,
Preparing an image screen which is sensitized by alpha particles of radon inside a radon chamber;
Evacuating gas inside the radon chamber such that the interior of the enclosed radon chamber forms a vacuum state;
Cooling the adsorption member disposed at one end of the radon chamber to freeze the radon gas introduced into the radon chamber;
Injecting radon gas from the radon source into the radon chamber; And
Wherein the image screen disposed at the other end of the radon chamber is sensitized by alpha particles of radon adsorbed to the adsorbent member. 6. The method of claim 5,
Between the step of cooling the adsorption member and the step of injecting the radon gas,
Further comprising the step of separating the radon gas from the other gas so as to reduce impurities other than the radon gas in the gas injected into the radon chamber. 6. The method of claim 5,
Further comprising irradiating the image screen with a laser so that light is emitted from the photosensitized portion of the photosensitized image screen. 8. The method of claim 7,
Further comprising the step of measuring the area of adsorption of radon by sensing light from the image screen irradiated with the laser.
KR1020140054247A 2014-05-07 2014-05-07 Adsorption area of radon measurement equipment and measuring method using the same KR101514251B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180066393A (en) 2016-12-08 2018-06-19 서울시립대학교 산학협력단 Radon detection system using image sensor module outputting digital information and detection method thereof
KR20180066394A (en) 2016-12-08 2018-06-19 서울시립대학교 산학협력단 RADON DETECTION SYSTEM USING IMAGE SENSOR MODULE USING Logic circuit OUTPUTTING DIGITAL INFORMATION AND DETECTION METHOD THEREOF

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03134585A (en) * 1989-10-11 1991-06-07 Commiss Energ Atom Real-time position measuring device for radiation source
JPH08136663A (en) * 1994-11-08 1996-05-31 Aloka Co Ltd Radon/thoron measuring instrument
JP2005024291A (en) * 2003-06-30 2005-01-27 Gifu Univ Radon detector
KR20120094773A (en) * 2011-02-17 2012-08-27 한국표준과학연구원 Equipment for providing standardized measurement of radon gas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03134585A (en) * 1989-10-11 1991-06-07 Commiss Energ Atom Real-time position measuring device for radiation source
JPH08136663A (en) * 1994-11-08 1996-05-31 Aloka Co Ltd Radon/thoron measuring instrument
JP2005024291A (en) * 2003-06-30 2005-01-27 Gifu Univ Radon detector
KR20120094773A (en) * 2011-02-17 2012-08-27 한국표준과학연구원 Equipment for providing standardized measurement of radon gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180066393A (en) 2016-12-08 2018-06-19 서울시립대학교 산학협력단 Radon detection system using image sensor module outputting digital information and detection method thereof
KR20180066394A (en) 2016-12-08 2018-06-19 서울시립대학교 산학협력단 RADON DETECTION SYSTEM USING IMAGE SENSOR MODULE USING Logic circuit OUTPUTTING DIGITAL INFORMATION AND DETECTION METHOD THEREOF

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