KR20150075761A - A panel for detecting radiation and an apparatus for detecting radiation therewith - Google Patents

Abstract

The present invention relates to an organic scintillator panel comprising: an organic scintillator panel (2) having an organic scintillator formed in the shape of a plate in predetermined constant thickness, width and length; scintillation-inducing means (4) arranged on a plurality of insertion parts (3), which have been formed in a predetermined pattern at regular intervals on the surface of the organic scintillator panel (2), to induce scintillation generated in the scintillator by radiation; and photomultiplying means (7) combined with the free end parts of the scintillation-inducing means extending from the organic scintillator panel to multiply the scintillation generated in the scintillator by radiation and generate electrical signals. Therefore, the organic scintillator panel can be used conveniently as a large panel for an apparatus for detecting the radiation of a large object and can detect radiation accurately by two scintillation-inducing means arranged with a predetermined distance therebetween.

Description

TECHNICAL FIELD [0001] The present invention relates to a radiation detecting panel and a radiation detecting device using the same. [0002]

The present invention relates to a radiation detection panel for use in a radiation detection apparatus, and more particularly, to a radiation detection panel for use in a radiation detection apparatus, and more particularly to an induction means for inducing a flash generated by collision of high energy particles of radiation emitted from a subject, The present invention relates to a radiation detection panel for detecting the position of a substance emitting radiation from an object to be inspected and measuring the amount of radiation emitted therefrom.

The present invention also relates to a radiation detecting apparatus for detecting a radiation dose emitted from an object to be inspected, such as a human body exposed to radiation or consumed radiation-emitting material by using the above-described radiation detection panel, or an imported object suspected of being exposed to radiation.

Broad radiation is not only ionizing radiation such as X-rays, radioactive isotopes, and spacecraft that can cause harm to the human body by causing ionization, but also electromagnetic waves including light or X-rays, alpha, beta and gamma rays generated from radioactive isotopes And the like. The phenomenon of ionization is a phenomenon in which ions are formed by separating the outer electrons from some of the elements constituting the material, and these ions transform the tissue to cause various changes in the living body.

In recent years, environmental pollution caused by radioactive materials following the expansion of the use of radiation, radiation damage caused by the radiation, and human injury due to radiation exposure have become important social problems.

Generally, radioactive contamination is pollution caused by radioactive waste flowing from a nuclear power plant or radioactive material handling workshop or laboratory, and alpha (alpha), beta, gamma rays emitted from radioactive material are excessively exposed to human body The tissue can be damaged or altered, and the damage is most severe in tissues or organs with intense cell division. It is especially affected by germ cells and can cause genetic modification. Therefore, there is a risk that a deformed child is born and causes cancer.

The amount of radiation that biologically affects the body is caused by radiation systemic exposure, 1 Sv causes some blood changes, 2-5 Sv causes nausea, hair loss, bleeding and, in many cases, death. More than 80% of deaths in 6 months or more within 2 months, and the lowest level of carcinogenicity is known to be 100 mSv / year.

In particular, the accident occurred in the Fukushima nuclear power plant in Japan, which is adjacent to Korea recently. Even the exact situation of radioactive contamination due to the accident has not been known, and the huge import and export volume of Japan and Korea and the influence of pollution of Korean coastal aquatic products It is difficult to grasp the actual situation of the fish in Japan and Japan, including the fish caught in the Pacific coast where the ocean currents are increasing anxiety about radioactive contamination of goods imported into Korea.

For this reason, there is an increasing need for precise inspections of radiation dose during the entry of persons suspected of being exposed to radiation or in the process of customs clearance of imported goods.

Examples of conventional radiation detectors include, but are not limited to, an electrical measuring instrument that uses ionization to detect and measure radiation, a scintillation counter that utilizes the fluorescence action of radiation, and a photographic plate that utilizes the photoreceptive action of photographic emulsions of radiation . Among the above methods, as an electric measuring device, various types of ionization boxes, Geiger-Müller counters, and the like, which utilize gas ionization are used.

The Geiger-Müller counter measures the intensity of the radiation passing through the electrode by measuring the change of the electrode potential by collecting the ions generated in the gas by the radiation by the ionization box. The Geiger- And counts the number of radiation particles by amplifying it. Here, in the case of the measuring device using the Geiger-Müller counter, in order to check the operating condition of the measuring device, the reference source was carried separately and the external Gauger-Muller counter was inspected. However, this method has a problem that the radiation source is lost, and it is difficult to keep the accurate distance from the Geiger-Müller counter, and the accuracy of the measured value is lowered.

In general, a radiation detector converts the scintillation generated when a high-energy radiation hits a scintillator into an electrical signal to measure the number and intensity of the radiation.

According to the related art, the patent application No. 10-2006-0099536 discloses a technique of constructing a radiation detector on a portable terminal, integrating a radiation detection device using a semiconductor detector into a portable terminal, measuring an exposure amount of radiation, setting a reference value And a device for ringing an alarm when a radiation exceeding a reference value is detected.

International Publication No. WO 2004/013655 discloses a radiation detector comprising a transmitter operatively arranged to transmit electromagnetism activity to an apparatus for the detection of a radioactive substance, a receiver operatively arranged to measure the intensity of the electromagnet activity, And a processing means operatively arranged to determine the presence of the radioactive material. However, there is a problem in that the radioactivity being generated in the atmosphere can not be precisely detected.

In addition, Japanese Patent Application No. 10-0641369 discloses a gamma sensor comprising an inorganic scintillator and an Si photodiode for measuring gamma radiation, a beta sensor comprising a ZnSe scintillator and a Si photodiode for measuring beta radiation, And a digital display unit for displaying the amount of radiation selectively measured through the beta sensor. ≪ IMAGE >

However, in the portable gamma beta radiation measuring apparatus, the beta sensor for measuring beta radiation is composed of a ZnSe scintillator and a silicon photodiode. Inorganic scintillators such as a ZnSe scintillator have a relatively long decay time, Only radiation can be measured. Photodiodes have advantages of low cost, but they are not sensitive to internal gain. Therefore, the intensity of the minimum input by radiation of high intensity, such as beta rays or gamma rays, There is a problem that can be measured.

Examples using organic scintillators and photomultiplier tubes are March 31, 2013. Korean Patent No. 10-1248760 discloses a cylindrical optical fiber or a square optical fiber as a plastic and glass optical fiber capable of transmitting light in a visible ray region emitted from an organic scintillator, A photodiode or Avalanche photodiode or a photo-multiplier tube (PMT) or position sensitive photo-multiplier tube, which can measure the optical signal transmitted through the photodiode, Quot; PS-PMT ") or a charged couple device (CCD) is disclosed in "Fiber-optic phantom dosimeter and measuring method using the same.

However, a photomultiplier tube (PMT) used as a means for amplifying light in the related art is an electron tube for measuring or detecting the intensity of light using photoelectrons due to external photoelectric effect, and a secondary electron emission The photoelectrons are multiplied by millions of times due to electrostatic focusing mainly by putting several high-density dicode nodes, but they are mechanically weak, require driving voltage of 1000 ~ 3000V, There is a problem that the cost is high and the price is expensive.

Also disclosed in U.S. Patent Publication No. 2011/0101230, published May 5, 2011, discloses an organic light-emitting device comprising an organic scintillator segment arrayed side by side and a pair of optically connected organic scintillator segments optically coupled to opposite ends of the organic scintillator segments to receive and generate an electrical signal therefrom, Lt; RTI ID = 0.0 > of: < / RTI >

However, in the above-described patent art, there is a problem that a plurality of organic scintillator segments are arranged and installed precisely in order to inspect the container, and scintillators are generated in each of these segments, and also the adjacent segments are influenced, The PMT is required to have a high driving voltage and requires a large maintenance cost. In addition, since the intensity of the light transmitted through the organic scintillator to the PMT disposed at the end of the radiation decreases, And it is difficult to process data in which redundancy is detected.

On the other hand, it has been desired to develop a technology that can more accurately measure the radiation dose for human or imported goods with simpler and lower cost.

Patent Application No. 10-2006-0099536 International Publication No. WO 2004/013655 Korean Patent No. 10-0641369 Korean Patent No. 10-1248760 U.S. Published Patent Application No. 2011/0101230

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scintillation induction device in which an organic scintillator is formed as a panel and a scintillation induction means is disposed in each of a plurality of inserting portions formed in a predetermined pattern on the organic scintillation panel, And to provide a radiation detection panel for measuring the amount of radiation emitted from an object to be inspected such as a human body or an imported article.

It is another object of the present invention to provide a radiation detecting apparatus which is constituted by a closed test room or a tunnel type using the above-described radiation detection panel to accurately check the radiation dose of the subject and the position of the radiation-emitting substance.

According to an aspect of the present invention, there is provided a radiation detection panel comprising: an organic scintillator panel having an organic scintillator formed in a plate shape with a predetermined thickness, width, and length, A scintillation inducing means disposed in a plurality of inserting portions formed in a predetermined pattern for guiding the scintillation generated in the scintillator by the radiation, a scintillation inducing means coupled to the free end of the scintillation inducing means extending in the scintillation panel, And an amplifying means for amplifying the flash light and generating an electrical signal.

The organic scintillator panel may be formed of any one selected from the group consisting of polyvinylbenzene PVB, polystyrene PS and polyvinyltoluene PVT, P-terphenyl PTP, 2,5-Diphenyloxazole PPO or 2- (4-biphenyl) -5-phenyl-1,3,4-oxadiazole P-diphenylstilbene DPS), 1,4-bis (5-phenylphenyl) diphenylstilbene (PPS) as a first solute selected from 4-oxadiazole Bis (5-phenyloxazol-2-yl) benzene or 1,4-bis (5-phenyl-2-oxazolyl) benzene) (POPOP) and tributylphosphine (Tributylphosphine TBP) is mixed with a secondary mineral as a second solute.

The organic scintillation panel may be formed by molding the organic scintillator into a single plate, and an inserting portion for disposing the scintillation inducing means at predetermined intervals may be formed as a groove and fixed with a tape.

Alternatively, the organic scintillation panel may be formed in the form of an elongated plate piece, and a hole may be formed as an insertion portion in the longitudinal direction at the center thereof to insert the scintillating means into the hole.

The flash guiding means may be an optical fiber.

The demultiplexing means may be any one selected from SiPM and PMT.

The arrangement pattern of the flash guiding means fixed to the inserting portion may be linear at a constant interval.

The arrangement pattern of the flash guiding means fixed to the inserting portion may be formed in a spiral shape at regular intervals.

The organic scintillator panel assembly of the present invention comprises a scintillation inducing means fixedly arranged on a plurality of insertion portions formed on a surface of an organic scintillation panel formed in a plate shape with a predetermined thickness, A first organic scintillator panel coupled to an extended free end of the scintillation inducing means, the scintillator having a diffusing means for amplifying scintillation generated by the radiation and generating an electrical signal;

And a light diffusing means coupled to the extended free end of each of the scintillation guiding means, the scintillation guiding means being arranged in the insertion portion formed in the organic scintillation panel so as to be perpendicular to the arrangement of the scintillation guiding means of the first organic scintillator panel And a second organic scintillator panel overlapped with the first organic scintillator panel.

A lead plate may be disposed between the first organic scintillator panel and the second organic scintillation panel.

The radiation detecting apparatus according to the present invention comprises an organic scintillator panel having an organic scintillator panel formed in a plate shape with a predetermined thickness, width and length, and a plurality of inserting portions formed at predetermined intervals on the surface of the organic scintillation panel, A scintillation inducing means disposed at the free end of the scintillation inducing means disposed in the organic scintillator panel for inducing scintillation generated in the scintillator by the irradiation of radiation, and amplifying the scintillation generated in the scintillator by the radiation, And the like.

The organic phosphor panel may further include a lead plate and another organic phosphor panel in a structure superimposed on the back side of the organic phosphor panel.

The optical fibers as the scintillation inducing means are arranged linearly at right angles to each other at regular intervals on the organic scintillator panels so that the optical fibers of the organic scintillator panels can be arranged to form a lattice pattern.

According to the present invention, it is possible to easily form a plate as an organic scintillator and fix an optical fiber as a scintillation inducing means to a large-sized object as a large panel for a radiation detection device of a large object, So that the position of radiation generation can be detected more accurately.

1 is a schematic perspective view of a radiation detection panel according to an embodiment of the present invention;
FIG. 2 is a perspective view of the detection panels of FIG. 1 arranged at right angles to each other. FIG.
FIG. 3 is a schematic perspective view of a radiation detection panel assembly for detecting a gamma dose by providing a lead plate between the radiation detection panels of FIG. 1; FIG.
Figure 4 is a cross-sectional view of the assembled state of Figure 3;
5 is a schematic perspective view of a radiation detection panel of another embodiment of the present invention.
6 is a schematic perspective view of a radiation detection panel according to another embodiment of the present invention.
7 is a schematic perspective view of a radiation detection apparatus of an arrival site using a radiation detection panel.
FIG. 8 is a schematic perspective view of a radiation detection apparatus for a product loaded on a container in the importing container using the radiation detection panels according to the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the embodiment shown in Fig. 1, the radiation detection panel 1 according to the present invention forms holes as the insertion portion 3 at regular intervals in the organic scintillator panel 2 in which the organic scintillators are formed to have a predetermined thickness An optical fiber is inserted and fixed as a scintillation inducing means (4) for guiding a scintillation generated in the scintillator by radiation, and an optical diffusing means (7) is provided at an end of the optical fiber. The detection panel 1 forms a reflection film on the outer side surface thereof to prevent the light generated in the scintillator from leaking to the outside except for the optical fiber as the scintillation induction means 4. [

The organic scintillator panel 2 may include any one selected from the group consisting of polyvinylbenzene PVB, polystyrene PS and polyvinyltoluene PVT, P-terphenyl PTP, 2,5-Diphenyloxazole PPO or 2- (4-biphenyl) -5-phenyl-1,3,4-oxadiazole. 1,3,4-oxadiazole (PBD) as a first solute selected from the group consisting of trans-p, p'-diphenylstilbene DPS, 1,4-bis 5-phenyloxazol-2-yl) benzene or 1,4-Bis (5-phenyl-2-oxazolyl) benzene) (POPOP) (Tributylphosphine TBP) is mixed with a secondary mineral as a second solute to form a plate.

As the light diffusing means 7 provided at the end of each of the optical fibers as the scintillation inducing means 4, SiPM or PMT is installed, and the scintillation light generated when the high energy radiation emitted from the object collides against the organic scintillation panel And the induced glare is amplified by the light diffusing means 7 provided at the end and converts the glare generated in the organic glazing panel into an electrical signal.

The light emitted when the high energy of the radiation impinges on the organic scintillator panel is in the range of tens to hundreds of nanoseconds (ns), and the organic scintillation panel 2 of the present invention is capable of measuring more precisely and quickly than any conventional radiation metering device And can easily be assembled to a panel large enough for use in a detection apparatus for radiation detection of a cargo accommodated in a person or a container, so that it can be used in a large-sized detection apparatus. It is impossible to form a single body from the prior art, which makes it possible to manufacture a large-sized detection apparatus.

In the present invention, SiPM chips are used as the light diffusing means provided at each end of the optical fibers disposed on the organic scintillator panel. Conventionally, SiPM is used in medical equipment as an expensive module in which chips are integrated. It is preferable to use a single chip having a length of 3 mm each and integrally bonding SiPM to the end of the optical fiber to meet the chip size. With this configuration, responses of several hundreds ns or less are obtained, thereby obtaining a precise measurement of the radiation dose. Further, when the organic scintillator panel is irradiated with the radiation, the scintillation light generated in the scintillator will be detected by two optical fibers arranged adjacent to each other in the detection panel, so that only the received optical signal is treated as being valid, .

In addition, optical fibers are arranged side by side as a plurality of scintillation induction means 4 in the longitudinal direction at regular intervals in the organic scintillator panel 2 shown in FIG. 1, The two scintillator panels 2 and 2 'of the two scintillator panels 2 and 2' are arranged at right angles to each other and arranged in a lattice structure , It is possible to accurately detect the radiation generating position by checking which optical fiber the scintillation generated by the radiation is detected. This can accurately detect the position of the radiation-contaminated cargo in the containers stored in the container do.

3 and 4 illustrate a case where a lead plate 9 having a predetermined thickness is disposed between the radiation detection panels 2 and 2 'of FIG. 1, for example, to allow gamma rays to pass therethrough, There is shown a radiation detection panel assembly 10 in which the flash guiding means of the radiation detection panels 2, 2 'are arranged in a lattice pattern.

In the radiation detection panel assembly 10, the flashing of all the radiation is detected in the detection panel 2, but since the radiation having a weak penetration ability can not pass through the lead plate 9, the flash generated from the detection panel 2 ' And the optical fibers as the flash guiding means of the detection panel 2, 2 'are arranged in a lattice structure in the horizontal and vertical directions to confirm which optical fiber the flash was detected by Since the position of the gamma ray generation can be grasped, measurement of radiation having a large penetrating power such as gamma ray can be performed safely and accurately.

By using such a radiation detection panel assembly, it is possible to manufacture a large-sized radiation detection apparatus which can easily detect contamination by radioactivity even at the time of entry examination or container customs clearance.

In the embodiment shown in Figs. 1 to 4, the scintillator panel is formed in the shape of an elongated plate, and the inserting portion 3 is formed in the longitudinal direction at the center thereof to insert the scintillating means into the hole.

On the other hand, FIG. 5 shows another embodiment of the present invention, in which the radiation detection panel of the present invention is manufactured by molding the organic scintillator into a single, relatively wide plate, and arranging the optical fiber as the scintillation inducing means The insertion section 3 is formed as an insertion groove, and an optical fiber is arranged in the insertion section 3 and fixed with a tape 5. [ In this manner, it is not possible to form the radiation detection panel as a single body having a plurality of scintillation induction means, which makes it possible to manufacture a large-sized detection apparatus. This makes it possible to greatly reduce the cost of manufacturing the radiation detection panel and to easily assemble a panel large enough for use in a detection apparatus for radiation detection for a person or a cargo contained in a container, The manufacturing cost of the detection device can be greatly reduced. In the above embodiment, other cover means may be used in place of the tape for fixing the scintillating means 4 inserted into the inserting portion.

6 is a view showing another embodiment of the organic scintillator panel according to the present invention. In this embodiment, as the inserting portion 3 'at regular intervals formed on the plate-like organic scintillator, It shows that the fibers are fixed.

FIG. 7 is a radiation detection device 20 installed in, for example, an immigration control unit, and FIG. 8 schematically shows a radiation detection device 30 of a vehicle such as a container containing imported cargo. The radiation detecting apparatuses 20 and 30 are constructed in the form of a tunnel by combining the radiation detecting panel units 21 of the radiation detecting panel assemblies of FIGS. 2, 3, or 5 with the shielding members.

As shown in FIGS. 2 and 3, the radiation detection panel units 21 and 31 are arranged in a lattice structure with optical fibers arranged in a laminated structure on the organic scintillator panels. And the position of the contaminated portion or the cargo where the radiation is generated can be accurately detected.

The radiation detecting apparatuses 20 and 30 include a conventional control unit 40 and include an electric circuit unit for inspecting the photocurrent amplified by the light diffusing unit 7 to confirm changes in the values of current and voltage, It is possible to compare the stored stored value with the measured value so that the amount of high energy particles can be inspected by the value detected through the electric circuit, and to display the change organically. The controller may include a trigger circuit portion to trigger a voltage range when a flash generated by naturally occurring radiation is converted into an electrical signal, counts an effective value per unit time in the counter portion, It is possible to measure the radiation generated from the article to be investigated purely.

The radiation detection panel and its assembly of the present invention can detect the contamination of the radioactive material by the radioactivity of a medical inspection facility, a person inspecting a person or a container at the time of entry clearance or cargo clearance, And can be used for a detecting device for discriminating between the two.

2: organic scintillator panel 3, 3 ': insertion part
4: scintillation induction means 7: mad stimulation means
9: lead plate 20, 30: radiation detecting device
21, 31: Detection panel unit

Claims (13)

An organic scintillator panel 2 in which organic scintillators are formed into a plate with a predetermined thickness, width and length,
A scintillation inducing means 4 disposed on a plurality of inserting portions 3 formed at predetermined intervals on a surface of the organic scintillator panel 2 in a predetermined pattern to induce scintillation generated in the scintillators by radiation,
(7) coupled to the free end of the scintillation guiding means extending in the organic scintillator panel, for amplifying scintillation light generated by the scintillator by radiation and generating an electrical signal. The organic scintillator panel according to claim 1, wherein the organic scintillator panel (2) comprises a solvent selected from the group consisting of polyvinylbenzene PVB, polystyrene PS, polyvinyltoluene PVT, P- terphenyl PTP), 2,5-diphenyloxazole PPO or 2- (4-biphenyl) -5-phenyl-1,3,4-oxadiazole (2- (4-Biphenylyl P-diphenylstilbene DPS) as a first solute selected from the group consisting of (1) -5-phenyl-1,3,4-oxadiazole (PBD) 5-phenyloxazol-2-yl benzene or 1,4-bis (5-phenyl-2-oxazolyl) benzene) ) POPOP and tributylphosphine TBP as a second solute. The organic scintillator panel according to claim 1, wherein the second inorganic material is selected from the group consisting of POPPOP and tributylphosphine TBP. [3] The apparatus according to claim 1, wherein the organic scintillator panel (2) is formed by molding the organic scintillator plate into a single plate, an insert (3) for disposing the scintillation induction means (4) (5). ≪ / RTI > The organic scintillator panel (2) according to claim 1, wherein the organic scintillator panel (2) is formed in the form of an elongated plate piece, and a hole is formed in the center of the scintillator panel Wherein the organic thin film layer is formed on the substrate. The organic scintillator panel according to claim 3 or 4, wherein the scintillation inducing means is an optical fiber. 6. The organic scintillator panel according to claim 5, wherein the demultiplexer (7) is any one selected from SiPM and PMT. The organic scintillator panel according to any one of claims 1 to 4, wherein the arrangement pattern of the scintillating means (4) fixed to the inserting portion (3) is linear at regular intervals. The organic scintillator panel according to claim 3 or 4, wherein the arrangement pattern of the scintillation induction means (4) fixed to the inserting portion (3) is formed in a spiral shape at regular intervals. A scintillation guiding means 4 fixedly arranged on a plurality of inserting portions 3 formed at predetermined intervals on the surface of the organic scintillator panel 2 in which organic scintillators are formed into a plate with a predetermined thickness, width and length, A first organic scintillator panel (2) coupled to an extended free end of the scintillation inducing means and having a scintillator means (7) for amplifying scintillation generated by the radiation and generating an electrical signal;
(4) is arranged and fixed to an inserting portion (3) formed on an organic scintillator panel so as to be perpendicular to the arrangement of the scintillating means of the first organic scintillator panel (2) And a second organic scintillator panel (2 ') having a diffuser (7) coupled to an extended free end and overlapped with the first organic scintillator panel (2). The organic scintillator panel assembly according to claim 9, wherein a plywood (9) is disposed between the first organic scintillator panel (2) and the second organic scintillation panel (2 '). An organic scintillator panel 2 in which organic scintillators are formed into a plate with a predetermined thickness, width and length,
A scintillation inducing means 4 disposed on a plurality of inserting portions 3 formed at predetermined intervals on a surface of the organic scintillator panel 2 in a predetermined pattern to induce scintillation generated in the scintillators by radiation,
(7) coupled to the free end of the scintillation guiding means extending in the organic scintillator panel, for amplifying scintillation light generated by the scintillator by radiation and for generating an electrical signal. 12. The radiation detecting apparatus according to claim 11, further comprising a lead plate (9) and another organic scintillator panel (2 ') in a structure superimposed on the back side of the organic scintillator panel (2). The organic EL panel (2, 2 ') according to claim 11, wherein optical fibers as a flash guiding means (4) are linearly arranged at regular intervals on each of the organic scintillator panels (2, 2' Are arranged to form a pattern of a lattice structure.

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