KR20200007581A - Gaseous ionization detectors having a electric light source and radiation measurement apparatus having functions of detector checking, calibration, and automatic output stabilization using the same - Google Patents

Abstract

According to an embodiment of the present invention, provided is a gas ionization detector having an electrical light source, which comprises an optical assembly (200) having: a gas region (500) in which sensing of a radiation or a gas amplification by electrons occurs; a positive electrode (300) and a negative electrode (100) forming an electric field in the gas region (500) or detecting electrons and positive ion signals; a power driving means (700) outputting power set in the positive and negative electrodes so as to form the electric field inside the gas region; and an electric light source (210) irradiating light (810) therein to generate photoelectrons (820) by a photoelectric effect. The photoelectrons (820) are moved to the positive electrode (300) by an internal electric field formed by the power driving means (700) to generate a detection signal. Therefore, an objective of the present invention is to provide the gas ionization detector without deformation of an internal state and additional processing.

Description

GASEOUS IONIZATION DETECTORS HAVING A ELECTRIC LIGHT SOURCE AND RADIATION MEASUREMENT APPARATUS HAVING FUNCTIONS OF DETECTOR CHECKING, CALIBRATION, AND AUTOMATIC OUTPUT STABILIZATION USING }

The present invention relates to a gas ionizing detector having an electrical light source and an inspection, calibration, and automatic power stabilization radiation measuring apparatus using the same.

Radiation measuring equipment is applied to radiation monitoring facilities or radiation measuring instruments used in nuclear power plants, medical facilities, non-destructive companies, radioisotope handling agencies, accelerator facilities, defense / private / research fields, etc. Radiation detectors used in major radiation measuring devices can be classified as gas ionizing detectors, scintillator detectors and semiconductor detectors.

Among these, the gas ionizing detector is easy to handle and has excellent radiation measuring performance, so it can be applied in almost all radiation measuring fields such as area radiation monitor, survey meter, neutron detector, radioactive contamination tester and personal dosimeter. It is becoming.

In particular, the gas ionization detector has a gas filled type in which a detection gas is sealed in the detector, and a gas flow type in which the detector body flows into and out of the detector.

In addition, the gas ionizing detector may be classified into an ionization box, a proportional counter tube, and a GM counter tube according to operating conditions and operating characteristics.

Among these, ionization is collected by moving electron pairs generated by interacting with the gas to each electrode by an electric field formed between the cathode and the anode inside the gas ionization detector. A gas-amplified detector accelerates electrons with a stronger electric field, causing a series of gaseous ionization events (avalanches), and amplified pairs of electron ions are collected at the anode and cathode, respectively.

That is, the gas ionizing detector has been applied in the field of radiation measurement through various forms and configurations.

In addition, the prior art proposes a technique for the performance check and calibration for the gas ionizing detector as described above.

Conventional gas ionizing detectors use a solenoid placed around the detector to check the performance or condition, and place radioisotopes in the sensing area, or place a radioisotope (aka 'keep-alive source') inside the detector. The fixation was done by detecting background radiation.

However, the conventional technology, such as the use of radioactive isotopes incurs a lot of time and cost as a result of radiological safety management work in accordance with the radioisotope handling of the radiometer operator. Can cause

In addition, the area radiation monitor (Area Radiation Monitor), etc. need an additional electric drive for transporting the source into the shielding material when inspecting the detector, the failure of the electric drive may lead to a deterioration of the stability of the operation of the radiation measuring equipment.

In addition, the gas ionizing detector using the 'keep-alive source' cannot accurately measure the ambient radiation when the background signal value of the fixed source inside the detector is higher than the ambient radiation signal value outside the detector.

On the other hand, since neutron sources are difficult to shield and handle, neutron detectors such as BF ₃ proportional counters or ³ He proportional counters cannot be used by installing check sources.

That is, the gas ionizing detector collects electron ion pairs or accelerates electrons to induce gas amplification by the high voltage applied between the cathode and anode and the intensity of the electric field determined by the geometry of the cathode and anode. Changes or corrections reduce the sensitivity of the detector or make normal operation impossible.

In addition, the GM counter tube among gas ionization detectors involves complex processes such as cleaning, gas injection and gas encapsulation, heat treatment, and electrode protective film formation.The processed surface of the GM counter tube has a detector operation such as reactivity with the detector body during operation. And stability. Therefore, it is not desirable for the gas ionizing detector to undergo an additional process that can modify the detector internal material or internal state for artificial purposes.

Korean Unexamined Patent Publication No. 10-2017-0048182 (2017.05.08)

Therefore, the present invention has been made to solve the conventional problems, it is an object of the present invention to provide a gas ionizing detector without deformation of the internal state and further processing.

In addition, another object of the present invention is to use the photoelectric effect of the detector by using an electrical light source including at least one of visible light, ultraviolet light, infrared light and X-rays, without using environmental pollution and human harmful substances such as radioisotopes The present invention provides a gas ionizing detector capable of inspection, calibration, and automatic output stabilization functions (self-diagnosis and feedback) and a radiation measuring device using the same.

Therefore, the present invention may include the following examples in order to achieve the above object.

The embodiment according to the present invention outputs a gas region in which radiation is detected inside or a gas amplification is generated by an electron, and an anode and a cathode, an anode and a cathode, which form an electric field in the gas region or detect electron and cation signals. And an optical assembly including a power source driving means for forming an electric field inside the gas region and a light source for irradiating ultraviolet light to the inside of the detector to generate photoelectrons by the photoelectric effect, and the photoelectrons are disposed in the internal electric field formed by the power driving means. It is possible to provide a gas ionizing detector using a photoelectric effect of the light source, characterized in that moved to the anode to generate a detection signal.

In addition, another embodiment of the present invention includes a sensor unit including the gas ionizing detector of the above embodiment and a measurement control unit for receiving the detection signal of the gas ionizing detector to control the light source and the power drive means, the measurement control unit is a gas A signal measuring means for receiving a detection signal from the ionizing detector, a comparison means for comparing the detected signal received from the signal measuring means with a set reference value, calculating a difference, and outputting a power control signal if there is a difference between the detected signal and the reference value; And a power supply control means for outputting a control signal for adjusting the level of the operating power output from the power supply driving means or the amplifier gain in accordance with the power supply control signal of the comparing means, and maintaining the output of the gas ionizing detector constant. Outputting the power supply control signal until there is no difference between the detection signal and the reference value. Using a gas ionization detector includes an electrical light source for the ranging checks, it is possible to provide a correction, the automatic stabilizing output radiation measuring device.

In addition, another embodiment of the present invention includes a sensor unit including a gas ionizing detector included in the above embodiment and a measurement control unit for receiving the detection signal of the gas ionizing detector to control the electrical light source and power supply means; After measuring dead time, when the radiation does not react, the measurement control unit increases the electric field as the cation moves to the cathode, whereby the magnitude of the expected output signal reaches a discriminant level. It is possible to provide an inspection, calibration, and automatic power stabilization radiation measurement apparatus using a gas ionizing detector having an electrical light source, characterized in that the pulse period is set to operate the electrical light source after a resolving time. .

Therefore, the present invention is not deformed in the internal state, it is possible to shorten the number of processes has the effect of reducing the manufacturing and maintenance costs.

In addition, the present invention can electrically perform the inspection, calibration, automatic output stabilization function of the detector can significantly reduce the time and cost required for the operation of the detector, and cause human harmful and environmental pollution such as radioisotopes By not using the substance, there is an effect that can solve the safety management problem of handling the radioisotope.

1 is a perspective view showing a gas ionizing detector having an electric light source according to the present invention.
2 is a cross-sectional view showing an embodiment of FIG. 1.
3 is a cross-sectional view showing another embodiment of FIG. 1.
4 is a partial cross-sectional view showing an example of the photoelectric material combined with the first cathode.
5A and 5B are cross-sectional views illustrating another embodiment of the optical assembly.
6 is a cross-sectional view showing yet another embodiment of an optical assembly.
7 is a cross-sectional view showing yet another embodiment of the present invention.
8 is a block diagram showing an inspection, calibration, and automatic power stabilization radiation measuring apparatus using a gas ionizing detector having an electric light source according to the present invention.
9 is a diagram illustrating a pulse signal of a detection signal of continuous incident radiation and an electrical light source.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may properly define the concept of terms in order to best explain their invention in the best way possible. On the basis of this, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, “device”, and the like described in the specification mean a unit that processes at least one function or operation, which is implemented by a combination of hardware and / or software. Can be.

The term "and / or" throughout the specification should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of "first item, second item and / or third item" may be given from two or more of the first, second or third items as well as the first, second or third items. Any combination of the possible items.

In addition, the gas ionizing detector according to the present invention is an ion chamber, a GM counter (Geiger Muller Counter), a proportional counter (Proportional Counter), BF ₃ Neutron Detector, ³ He Neutron Detector, Proton Recoil Counter, Boron Lined Detector, It can be any of Fission Chamber, Beam Loss Monitor, and Drift Chamber.

In addition, the electrical light source in the present invention is to output any one of visible light, ultraviolet light, infrared light, X-ray (X-Ray), described as an embodiment using a double ultraviolet light, but is not limited thereto.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a gas ionizing detector having a light source according to the present invention and a check, calibration, automatic output stabilized radiation measuring apparatus using the same.

1 is a perspective view showing a gas ionizing detector having a light source according to the present invention, FIG. 2 is a sectional view showing one embodiment of FIG. 1, and FIG. 3 is a sectional view showing another embodiment of FIG.

1 to 3, an embodiment of a gas ionizing detector having a light source according to the present invention includes a cathode 300 and a first cathode 100 that forms an outer surface of an inner space into which the anode 300 is introduced. ), An insulator 400 shielding both ends of the first cathode 100, a gas region 500 filled with gas as an inner space shielded by the first cathode 100 and the insulator 400, Accelerating the photoelectric effect on at least one of the optical assembly 200 for outputting light to the inside, the anode 300 drawn from the inside to the outside, and the anode 300, the first cathode 100, and the insulator 400. For example, the gas ionizing detector 10 (see FIG. 8) includes auxiliary photoelectric material layers 600 and 610 and a power driving means 700 for supplying an operating power to form an electric field in the anode 300 and the cathode 100. ).

The above embodiment is a gas sealed type in which the gas region 500 is sealed by using the insulator 400, but the technical spirit of the present invention is described through the insulator 400, but the present invention is not limited thereto. Applicable also to (refer FIG. 7).

The power supply driving unit 700 supplies operating power to the anode 300 and the cathode 100 to form an electric field in the gas region 500. Here, the power supply driving means 700 is a device for outputting a high voltage to the cathode and the anode of the detector. The power supply driving means 700 can adjust the power supply level under the control of the measurement control unit 3 (see FIG. 8), which will be described later, and maintains the signal level output from the positive electrode (or the negative electrode) at the set level. That is, the power source driving means 700 stabilizes the output signal of the detector under the control of the measurement control section 3.

In the case of the sealed type, the first cathode 100 is formed in a structure in which one end or both ends of the first cathode 100 are opened and a gaseous region 500 is formed inside the hollow cathode.

The anode 300 and the first cathode 100 are supplied with operating power to the power supply driving means 700 for outputting an electrical signal, and output a detection signal of radiation. Herein, the anode 300 is introduced into any one of both ends of the first cathode 100.

The gas region 500 is an inner space shielded by the first cathode 100 and the insulator 400 and is applied to the electrical energy supplied from the power supply driving means 700 through the anode 300 and the first cathode 100. By forming an electric field, electrons and cations generated by radiation are moved to the anode and the cathode, respectively, and above a certain electric field strength, gas amplification by the electron is generated.

When the light 810 (eg, ultraviolet light) output from the optical assembly 200 is incident, the photoelectric material layers 100, 400, 600, and 610 generate the photoelectrons 820 through the photoelectric effect in the detector interior space. Let's do it. Here, the photovoltaic material layers 100, 400, 600, and 610 are auxiliary photovoltaics made of the first cathode 100 and / or the insulator 400 itself or a material 600 or a laminated metal plate 610 coupled to the cathode and the insulator. Material layers 600 and 610 may be used. This will be described with reference to FIGS. 3 and 4. 4 is a partial cross-sectional view illustrating an example of the photoelectric material layer 600.

Referring to FIGS. 3 and 4, the auxiliary photoelectric material layers 600 and 610 may be stacked on the inner surface of the insulator 400 and the first cathode 100, or may be laminated on the surface and the inner surface of the insulator 400. At least one of a metal layer, a material produced by a chemical reaction between a gas and an electrode (anode and cathode), or a bonded metal plate. Alternatively, the auxiliary photoelectric material layers 600 and 610 may be at least one of a neutron nuclear reaction material for detecting neutrons or a material formed on the surface of the neutron nuclear material.

Here, the coating may be, for example, any one or more of an oxide coating such as chromium oxide (Cr ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ).

In addition, the material produced by the chemical bond between the gas and the electrode is CrBr ₂ , CrBr ₃ (chromium bromide), CrCl ₂ , CrCl ₃ (chromium chloride) FeCl ₂ , FeCl ₃ (iron chloride), FeBr ₂ , FeBr ₃ (iron bromide It may be at least one of).

The metal plate coupled to the insulator and the cathode may be one or more of silver (Ag), gold (Au), platinum (Pt), carbon (C, graphite), titanium (Ti), and inconel.

In the photovoltaic layer 100, 400, 600, 610, the electrons on the surface absorb energy above the metal's intrinsic work function in the ultraviolet light 810, and the photoelectric effect is generated to absorb the energy. The photoelectron 820 having the kinetic energy minus the work function due to the attraction of the nucleus is generated.

More specifically, the gas ionization detector 10 generally uses metals such as stainless steel, aluminum, and tungsten, which are mostly used as cathode materials, and the above metals react with oxygen to form a metal material. An oxide film, such as a thin chromium oxide (Cr ₂ O ₃ ) or aluminum oxide (Al ₂ O ₃ ), is formed on the surface of the film to protect the metal material.

The work functions of stainless steel, aluminum and tungsten are 4.4 eV, 4.3 eV and 4.5 eV, respectively. The work functions of chromium oxide (Cr ₂ O ₃ ) and aluminum oxide (Al ₂ O ₃ ), which are oxide films of the electrode material, are At 5 eV and 4.7 eV, respectively, the work function of the detector material is mostly 5 eV or less.

Therefore, when the energy of the ultraviolet light 810 irradiated into the detector is greater than or equal to the work function of the detector material, the photoelectron 820 is generated by the photoelectric effect. The optoelectronic 820 may be emitted to the gas region 500 inside the detector by an electric field formed around the periphery and move to the anode 300 to generate a detector signal.

Thus, the generation of the detector signal as the photoelectric effect by the ultraviolet light 810 is applicable to the main subject of the present invention irrespective of the type of the gas ionizing detector 10.

For example, in the case of ionizing, as the photoelectron 820 emitted from the surface of the photoelectric material layer 100, 400, 600, 610 is moved to the anode to generate the photoelectric detection signal, the radiation measuring device checks as the photoelectric detection signal. Proceed with calibration, automatic output stabilization. Alternatively, the proportional counter or the GM counter may perform gas multiplication such as an avalanche (see FIGS. 2 and 3) inside the detector by the photoelectrons 820 generated by the photoelectric effect by the ultraviolet light 810. To generate a detection signal.

That is, the present invention generates a detection signal using the photoelectrons generated by irradiating light inside the gas ionization detector, which includes both the photoelectric detection signal and the detection signal according to the amplification of the photoelectron.

This means that it is applied in various ways according to the type of gas ionizing detector 10, each of the embodiments corresponding to the scope of the technical spirit of the present invention.

The light assembly 200 includes an electrical light source 210 that outputs light 810 to the gas region 500 through the insulator 400, and an optical window 220 that diffuses light output from the front surface of the electrical light source 210. ) May be included. The electrical light source 210 is a light emitting diode (for example, UV LED) for outputting light 810 (for example, visible light, ultraviolet light, infrared light, X-rays, and will be described below using ultraviolet light). ), A lamp (eg UV lamp), a laser (eg UV laser).

The optical assembly 200 having the above structure will be described with reference to FIGS. 3, 5, and 6. 3 illustrates one embodiment of the optical assembly 200, FIGS. 5A and 5B show another embodiment of the optical assembly 200, and FIG. 6 shows another embodiment of the optical assembly 200. .

First, referring to FIG. 3, the optical assembly 200 according to the present invention is installed in openings 410 and 420 formed through the insulator 400. The openings 410 and 420 may include a first opening 410 in which the optical windows 220 and 222 are inserted, and a second opening 420 in which the electric light source 210 is installed. In addition, the first opening 410 and / or the second opening 420 is coated with a sealing material 230 for fixing the electrical light source 210 and the optical windows 220 and 222 and vacuum sealing the inside of the wall. Can be.

Herein, an optical coupling layer 211 stacked as a photoconductor or optical epoxy may be added between the electrical light source 210 and the optical windows 220 and 222 for optical coupling. This is described with reference to FIGS. 5A and 5B as another embodiment of the light assembly 200.

5A and 5B, a light conductor may be provided on the front lens (emission surface) of the electrical light source 210 inserted into the second opening 420 of the insulator 400. Alternatively, the optical coupling layer 211 made of any one of the optical epoxy, the protective layer 221 formed on the exit surface of the optical window (220, 222), and the vacuum sealing of the inside and the optical window (220, 222) The sealing member 230 may further include.

The light coupling layer 211 may include at least one of an optical conductor (eg, an optical grease, an optical pipe, an optical interface), or an optical epoxy.

The protective layer 221 is formed on the exit surfaces of the optical windows 220 and 222 to form a film for preventing the deterioration of optical functions generated during the manufacturing process and operation, or is formed by a surface treatment such as ion beam injection.

The coating may be formed of, for example, a thin film or a coating layer which may protect the optical windows 220 and 222 from contaminants that may occur during detector operation or during detector manufacture.

For example, the coating layer formed of the protective layer 221 may be formed of aluminum nitride (AlN), sapphire (3NAl ₂ O ₃ ), CaF ₂ (calcium fluoride), BaF ₂ (barium fluoride), or Al ₂ O ₃ (aluminum oxide). ), A thin film formed by one or more of KBS (potssium bromide), MgF ₂ (magnesium fluoride) or fused silica, borosilicate.

In addition, surface treatment by ion beam implantation is performed among H, He, N, Ar, Ne, O, Kr, Xe, B, Mg, Al, Si, Fe, Ag, In, Cu, Zn, Ta, Au, Mg, Ti Ions may be implanted by either.

The sealing material 230 is applied to the wall surface of the first opening 410 to seal the gap between the outer surfaces of the optical windows 220 and 222. Here, the sealing material 230 is manufactured by means or a method such as frit glass, vacuum epoxy, O-ring or welding to completely block the inflow and outflow of gas and foreign matter between the inside and the outside of the cathode.

In addition, the optical assembly 200 according to the present invention can provide a more simplified structure than the above embodiment. This will be described with reference to FIG. 6.

Referring to FIG. 6, another embodiment of the optical assembly 200 omits the optical windows 220 and 222, and forms an opening hole (not shown in the drawing) in the insulator 400 to form the electrical light source 210. It is a structure to fasten only. Here, the wall surface of the opening hole (not shown in the figure) is formed with a sealing material 230 to block the separation and the gap between the outer surface and the opening of the electrical light source 210 to vacuum seal the inside. Such a structure may be simplified as compared with the above-described embodiment, thereby saving manufacturing cost and time.

In addition, the present invention can provide a gas flow detector in addition to the gas-sealed detector described above. This will be described with reference to FIG. 7.

7 is a cross-sectional view showing yet another embodiment of the present invention.

Referring to FIG. 7, another embodiment of the present invention is characterized by a structure in which gas flows into and out of the detector, and enables the internal opening.

In more detail, another embodiment of the present invention provides a second cathode 100 ′ having a gas region 500 formed therein, an electric light source 210 fixed inside, and a detection signal drawn outward. It may include a positive electrode 300 for outputting, and a power source driving means 700 for outputting a high voltage.

The second cathode 100 ′ has an inlet 122 through which gas is introduced, an outlet 121 through which internal gas flows out, an opening window 110 opened to allow radiation to be incident, and an electrical light source 210 to which the second cathode 100 ′ is fixed. The light source fixing opening 130 may be formed. In the structure of the second cathode 100 ′, a gas region 500 in which gas is filled is present, and the anode 300 is fixed to communicate with the gas region 500 from the outside.

In addition, the electrical light source 210 is fixed to the light source fixing opening 130 of the second cathode 100 ′ and installed inside.

That is, the electrical light source 210 is installed in the gas region 500 of the detector to irradiate the ultraviolet light 810 to react with the photoelectric material inside to generate the photoelectron 820. The optoelectronic 820 is input to the anode 300 and output as a detection signal. The detection signal may be a photoelectric detection signal due to the movement of the optoelectronic 820 or a detection signal according to gas amplification. This may be defined as a detection signal generated by the optoelectronic 820 as a function of the movement of the optoelectronic 820 to the anode. That is, the optoelectronic 820 is moved to the anode to generate a detection signal.

In addition, the gas flow detector corresponding to another embodiment according to the present invention may further include the above-described auxiliary photoelectric material layers 600 and 610. That is, the second cathode 100 ′ may include at least one of a photoelectric material by a film, a metal layer, or a material thereof, and a photoelectric material by a chemical reaction with a gas.

Therefore, the present invention is characterized in that the gas ionizing detector 10 generates the detection signal necessary for the performance check and calibration by the electron 810 generated by irradiating the ultraviolet light 810. This is applicable to both gas flow or sealed detectors.

In addition, the gas ionizing detector 10 according to the present invention is an ion chamber, a GM counter (Geiger Muller Counter), a proportional counter (Proportional Counter), BF ₃ Neutron Detector, ³ He Neutron Detector, Proton Recoil Counter, Boron As one of a lined detector, a fission chamber, a beam loss monitor, and a drift chamber, it is possible to generate a detection signal for calibration and performance check as an optoelectronic 820 by ultraviolet light 810.

Therefore, the present invention can provide a radiation measuring apparatus capable of checking, correcting, and automatically stabilizing an output as the detection signal can be generated using the ultraviolet light 810 as described above. Hereinafter, an inspection, calibration, and automatic power stabilization radiation measuring apparatus using a gas ionizing detector having a light source will be described.

8 is a block diagram showing an inspection, calibration and automatic power stabilization radiation measuring apparatus using a gas ionizing detector with a light source according to the present invention.

Referring to FIG. 8, the inspection, calibration, and automatic output stabilization radiation measuring apparatus using a gas ionizing detector having a light source according to the present invention includes a sensor unit 1 for outputting a temperature and radiation measurement signal, and a sensor unit 1. And a measurement control unit 3 for receiving the temperature and the measurement signals TDS1 and DS1 of the control unit and controlling the output of the gas ionizing detector 10 and the electrical light source 210.

The sensor unit 1 is a gas ionizing detector 10 for outputting a detection signal DS1 generated through the photoelectron 820 generated by the photoelectric effect by the electrical light source 210, and the temperature of the electrical light source 210 And a temperature sensor 20 for outputting a detection signal TDS1.

The gas ionization detector 10 includes a cathode 100, an insulator 400, an anode 300, and auxiliary photoelectric material layers 600 and 610 as one of a gas sealing type and a gas flow type, and an electric light source 210. As the ultraviolet light 810 irradiated from) is incident on the photoelectric material layers 100, 400, 600, and 610, the photoelectron 820 due to the photoelectric effect is moved to the anode 300, thereby outputting a detection signal.

The temperature sensor 20 senses the temperature of the electrical light source 210 and outputs it to the measurement controller 3.

The measurement control unit 3 compares the temperature measuring means 31 which receives the temperature sensing signal TDS1 from the temperature sensor 20 with the temperature sensing signal TDS2 received by the temperature measuring means 31. If there is a difference with the value T1, the light source control signal UV CS is applied in accordance with the temperature compensating means 36 for outputting the temperature compensating signal TRS and the temperature compensating signal TRS output from the temperature compensating means 36. A light source output control means 32 for outputting, a signal measuring means 33 for receiving the detection signal DS1 of the gas ionizing detector 10, and a comparison means 35 for comparing the detection signal DS2 with the reference signal. And a power source control means 34 for outputting a power source control signal CS of the gas ionizing detector 10.

The signal measuring means 33 receives the detection signal DS1 output by the photoelectron 820 generated by the photoelectric effect by the ultraviolet light 810 output from the electrical light source 210 in the gas ionizing detector 10. It receives, converts and amplifies it as the set level and signal DS2, and outputs them to the comparison means 35.

When the comparison means 35 compares the set reference value with the detection signal DS2 and determines that the difference has occurred, the comparison means 35 outputs the power control signal RS to the power control means 34 until the difference is eliminated. In other words, the comparison means 35 performs feedback control via the detection signal DS1.

The power source control means 34 controls the power source driving means 700 of the gas ionizing detector 10 in accordance with the power source control signal CS of the comparing means 35 to stabilize the detection signal output from the positive electrode (or the negative electrode). Control as possible.

Herein, the power supply driving unit 700 may include at least one of a device or an amplifier for outputting a high voltage.

Therefore, the power supply control means 34 outputs the control signal CS for adjusting the level of the high voltage to the power supply driving means 700. That is, the power supply control means 34 is supplied to the gas ionizing detector so as to control the power supply driving means 700 so that the detection signal (and / or output signal) output from the anode (or cathode) can be maintained at the set level. Control the operating power.

The temperature measuring means 31 receives the temperature sensing signal TDS1 of the electrical light source 210 received from the temperature sensor 20, amplifies and / or converts the temperature sensing signal TDS2 to the temperature compensating means 36. )

The temperature compensation means 36 compares and determines whether the temperature detection signal TDS2 of the temperature sensor 20 is different from the set reference temperature, and outputs a temperature compensation signal TRS when a temperature difference occurs.

The light source output control means 32 has the intensity and / or pulse period of the electric light source 210 so that the output of the light source is always constant even if the temperature is changed according to the temperature compensation signal TRS output from the temperature compensating means 36. The adjusted light source control signal UV CS is output.

In this case, the electric light source 210 is continuously driven by a DC current or a pulse by the light source control signal UV CS of the light source output control means 32. At this time, the light source output control means 32 controls the light intensity of the electrical light source 210 according to the set driving current. In addition, when the electrical light source 210 is driven by a pulse, the electrical light source 210 is controlled to at least one or more of the intensity of the pulse frequency, duty ratio, ultraviolet light 810.

More specifically, the gas ionizing detector 10 may output a signal in the form of a current, and a proportional counter or a GM counter may output a signal in the form of a voltage. It is also possible to use both current and voltage output signals rather than specifying one.

For example, since the magnitude of the voltage output signal of the GM counter is constant, it is not possible to use the height (i.e. crest) information of the voltage output signal. Instead, the state of the detector must be measured by counting (or frequency) information. It is desirable to drive 210 as a pulse.

In addition, the light source output control means 32 controls the electric light source 210 by calculating the pulse period output to the electric light source 210 in order to be able to detect the detection signal according to the measurement of the continuous incident radiation as a separate signal. It is possible. This will be described with reference to FIG. 9.

9 is a diagram illustrating a pulse period of the incident radiation detection signal and the electric light source 210.

Referring to FIG. 9, the gas ionizing detector 10 (for example, the GM counter) forms a space charge due to a slow cation around the anode 300 inside the detector at the moment when the radiation is detected. The dead time (e) which does not react even if radiation enters at this moment arises by weakening intensity | strength.

 At this time, after dead time (e), the electric field gradually increases as the cation moves to the cathode 100, and the magnitude of the expected output signal reaches a discriminant level (a level recognized as a signal). The elapsed time of is called the resolving time (d).

Therefore, the decomposition time (d) corresponds to the minimum time interval that can detect a signal by measuring two different incident radiation as a separate signal. Therefore, when the electrical light source 210 output control means drives the electrical light source 210 with a pulse, it is preferable to set the pulse interval a of the light source to the decomposition time d or more.

In summary, the present invention is applicable to both the gas-sealed or the flow-type detector, it is possible to output the ultraviolet light 810 to the gas region 500 inside the detector to generate a detection signal by the photoelectric effect.

Therefore, in the present invention, if the detection signal generated using the photoelectric effect by the ultraviolet light 810 is different from the set reference value, the power control means 34 may be adjusted until the difference is eliminated, and the temperature sensor 20 It is possible to compensate for the light intensity according to the temperature difference by checking the temperature of the electrical light source 210 using a) characterized in that the automatic output stabilization function is possible.

Compared to the related art, it is possible to save manpower, cost, and time for management, since it does not use harmful substances such as radioactive isotopes and substances that can cause environmental pollution.

The present invention described above is merely illustrative, and those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom.

Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims.

1 sensor unit 3 measurement control unit
10 gas ionizing detector 20 temperature sensor
31: temperature measuring means 32: light source output control means
33: signal measuring means 34: power supply control means
35 comparison means 36 temperature compensation means
100, 100 ': cathode 110: aperture window
121: outlet 122: inlet
130: opening 200: optical assembly
210: electrical light source 211: light coupling layer
220, 222: optical window 221: protective layer
230: sealing material 300: anode
400: insulator 410: first opening
420: second opening 500: gas area
600, 610: photoelectric material layer 700: power drive means
810: ultraviolet light 820: optoelectronic

Claims (12)

Gas region 500 in which sensing of radiation or gas amplification by electrons occurs;
An anode 300 and a cathode 100 forming an electric field in the gas region 500 or detecting electron and cation signals;
Power supply means 700 for supplying operating power to the anode and the cathode to form an electric field inside the gas region; And
And an optical assembly (200) having an electrical light source (210) for irradiating light therein to generate the photoelectron (820) by the photoelectric effect.
Optoelectronic 820
A gas ionizing detector having an electric light source, characterized in that it is moved to the anode (300) by an internal electric field formed by the power source driving means (700) to generate a detection signal.
The method according to claim 1, wherein the gas ionizing detector
Ion Chamber, GM Counter (Geiger Muller Counter), Proportional Counter, BF ₃ Neutron Detector, ³ He Neutron Detector, Proton Recoil Counter, Boron Lined Detector, Fission Chamber, Beam Loss Monitor, Drift Chamber A gas ionizing detector having an electrical light source, characterized in that.
The method of claim 1, wherein the gas ionization detector
Gas filled type in which the gas region 500 is sealed, and a gas flow type in which an inlet 122 and an outlet 121 are formed to allow inflow and outflow of gas into and out of the detector. Gas ionization detector having an electrical light source, characterized in that any one of).
The method according to any one of claims 1 to 3,
Photoelectric material layers 100, 400, 500, 600, and 610 that emit photoelectrons inside the detector by generating a photoelectric effect in any one of the cathode 100, the insulator 400, and the gas region 500 by the light 810. ), Including photo-emissive material,
Photoelectric material layer
And a secondary photoelectric material layer (600, 610) coupled to the cathode or the insulator to generate a photoelectric effect.
The method of claim 4, wherein the auxiliary photoelectric material layer (600, 610) is
A film formed on the surface of the cathode 100 or the insulator 400, a metal layer electrically connected on the surface of the cathode 100 or the insulator 400, a compound produced by a chemical reaction between the gas and the electrodes, and for detecting neutrons. A gas ionizing detector having an electrical light source, characterized in that at least one of a neutron nuclear reaction material or a material formed on the surface of the neutron nuclear material.
The method of claim 1, wherein the cathode 100 or the insulator 400
A first opening 410 formed therethrough and a second opening 420 extending to the first opening 410 to install an electrical light source 210;
The optical assembly 200
Optical windows 220 and 222 installed in the first opening 410 to transmit or diffuse the light 810 output from the electrical light source 210; Type detector.
The method of claim 6, wherein the optical window (220, 222) is
Further comprising a protective layer 221 for preventing optical function deterioration,
The protective layer 221
A gas ionizing detector having an electric light source, characterized in that formed by the surface treatment by a thin film, coating layer or ion beam implantation formed on the surface of the optical window (220, 222).
The method of claim 1, wherein the electrical light source 210 is
For optical coupling, the optical coupling layer 211 formed of an optical conductor or optical cement, which is one of an optical grease, an optical pipe, and an optical interface, may be used. A gas ionizing detector having an electrical light source further comprising.
The electric light source of claim 1 or 6, wherein the electric light source 210 is fixed directly to the opening hole formed through the outer surface of the insulator without the optical windows 220 and 222 by the sealing material 230. Gas ionization detector equipped.
A sensor unit (1) comprising the gas ionizing detector of claim 1; And
And a measurement control unit 3 which receives the detection signal of the gas ionizing detector and controls the electric light source 210 and the power driving means 700.
The measurement control unit 3
Signal measuring means (33) for receiving a detection signal from a gas ionizing detector;
Comparing means (35) for comparing the detected signal received from the signal measuring means (33) with the set reference value, calculating the difference, and outputting a power supply control signal if there is a difference between the detected signal and the reference value; And
And a power control means 34 outputting a control signal for adjusting the operating power level of the power supply driving means 700 according to the power control signal of the comparing means 35 to keep the output of the gas ionizing detector constant. ,
The comparison means 35
An inspection, calibration, and automatic output stabilization radiation measurement apparatus using a gas ionizing detector having an electric light source, characterized by outputting a power control signal until a difference between a detection signal and a reference value does not occur.
A sensor unit (1) comprising the gas ionizing detector of claim 1; And
And a measurement control unit 3 which receives the detection signal of the gas ionizing detector and controls the electric light source 210 and the power driving means 700.
The measurement control unit 3
After dead time that does not react even when radiation is incident, the cation moves to the cathode 100, and the electric field gradually increases so that the magnitude of the expected output signal reaches a discriminant level. Inspection, calibration, automatic output stabilization radiation measuring device using a gas ionizing detector having an electrical light source, characterized in that the pulse period is set to operate after the dissolving time (Resolving time).
The method according to claim 10 or 11, wherein the sensor unit 1
Further comprising; a temperature sensor 20 for sensing the temperature of the electrical light source 210,
The measurement control unit 3
Temperature measuring means (31) for receiving a temperature detection signal from the temperature sensor (20) and measuring the temperature of the electrical light source (210);
A temperature compensating means 36 for comparing the temperature of the electric light source 210 measured by the temperature measuring means 31 with the set temperature and outputting a temperature compensation signal if a difference occurs; And
A light source output control means for controlling the electric light source 210 so that the light intensity is constant by adjusting at least one of a pulse period, a duty ratio, and a power level of the electric light source 210 according to the temperature compensation signal of the temperature compensating means 36 ( 32); inspection, calibration, automatic output stabilization radiation measurement apparatus using a gas ionizing detector having an electrical light source, characterized in that it further comprises.

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