KR102309550B1 - Beta nuclide measuring system and method considering beta nuclide characteristic - Google Patents

Abstract

The present invention is a radiation collection unit that collects liquid radiation from an underwater site, and performs a pretreatment considering the type of a beta nuclide to be measured on the collected liquid radiation, and from the collected liquid radiation To measure including a measurement target separation unit for separating the measurement target beta nuclide, and an energy measurement unit for measuring the radioactivity of the measurement target beta nuclide through control of the amplification degree of the main amplifier according to the emission energy size of the separated measurement target beta nuclide By differentiating the measurement conditions in consideration of the characteristics of the beta nuclide, more reliable measurement is possible.

Description

Beta nuclide measuring system and method considering beta nuclide characteristic}

The present invention relates to a beta nuclide measurement technology, and more particularly, to a beta nuclide measurement system and method in consideration of the beta nuclide characteristic for measuring a more reliable beta nuclide in consideration of each characteristic of the beta nuclide in liquid radiation. .

Because beta rays lose their energy as they pass through the medium, it can be said that the movement distance within the medium is limited. At this time, the distance that beta-rays travel in the medium is called amorphous. In general, beta-nuclides in a water sample have short irregularities, making it difficult to measure them.

In the existing method of measuring beta nuclides in a water sample, the sample is prepared in a measurable state through physical and chemical pretreatment after collecting the water sample, that is, pretreatment is performed. After putting the liquid scintillator into the pretreated water sample, measure the beta-nuclide through a liquid scintillation counter or low-level beta meter.

However, this method has a problem that secondary waste is generated in the pretreatment process. In addition, it has a limitation in that a lot of time, money, and manpower are consumed during the process of sampling, pre-processing, measurement and analysis.

Accordingly, in measuring beta nuclides in a water sample, there is a need to develop a technology capable of minimizing the generation of secondary waste due to chemical pretreatment and measuring in real time.

Japanese Laid-Open Patent Publication No. 1995-113872

Accordingly, the present invention has been proposed in consideration of the above matters, and an object of the present invention is to enable a more reliable measurement by different measurement conditions in consideration of the characteristics of a beta nuclide to be measured.

In addition, an object of the present invention is not to simply increase the efficiency of a measurement system, but to implement a customized measurement technology for each measurement target through pre-processing that can separate and measure nuclides.

In addition, an object of the present invention is to be able to measure the effect of only tritium through a pretreatment technique applicable to seawater as well as water samples.

In addition, the present invention separates tritium through the introduction of pre-treatment equipment, which is an ultrapure water production device, in order to effectively detect low-energy beta nuclides, particularly tritium, and adjusts the amplification degree of the main amplifier among measuring equipment for the measurement of low-energy beta nuclides. It aims to efficiently perform the measurement of radionuclides versus radioactivity.

m 필터를 사용하여 순수를 제조할 수 있는 것을 목적으로 한다.In addition, the present invention is an MF filter, AC filter, RO membrane filter, mixed bed ion exchange resin for ultrapure water, 0.2

It aims to be able to manufacture pure water using the m filter.

In addition, an object of the present invention is to make it possible to use it as a means of securing radiological safety by applying a water sample of a nuclear facility or groundwater of a nuclear power plant decommissioning site.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the beta nuclide measurement system in consideration of the beta nuclide characteristics according to the technical idea of the present invention is a radiation collection unit that collects liquid radiation from an underwater field, and the collected liquid radiation is A measurement target separation unit that separates the measurement target beta nuclide from the collected liquid radiation by performing pre-treatment in consideration of the type of the measurement target beta nuclide, and the main amplifier according to the emission energy size of the separated measurement target beta nuclide It may include an energy measuring unit for measuring the radioactivity of the beta nuclide to be measured by adjusting the amplification degree.

When the measurement target beta nuclide is total beta, the measurement target separation unit may perform physical filtering on the collected liquid radiation to perform pretreatment, and then separate all beta from the collected liquid radiation. .

The measurement target separation unit, when the measurement target beta nuclide is tritium, a suspended particle removal unit for removing suspended particles in the collected liquid emission, residual chlorine and organic matter in the liquid emission from which the suspended particles are removed Residual chlorine and organic matter removal unit to remove, metal ion and salt removal unit for removing metal ions and salt in the liquid emission from which the residual chlorine and organic matter are removed, Residual in the liquid emission from which the metal ions and salt are removed After pretreatment including a residual ion removal unit for removing ions, a microorganism and particle removal unit for removing microorganisms and particles in the liquid radiation from which the residual ions are removed, tritium is separated from the collected liquid radiation can do.

m 필터라 할 수 있다.At this time, the suspended particle removal unit is an MF filter (Micro Filteration), the residual chlorine and organic matter removal unit is an AC filter (Activated Carbon), and the metal ion and salt removal unit is an RO membrane filter (Reverse Osmosis Membrane), and the residual ions The removal unit is a mixed bed ion exchange resin for ultrapure water, and the microorganism and particle removal unit is 0.2

m filter.

The energy measuring unit may measure the radioactivity of the target beta nuclide by adjusting the amplification degree of the main amplifier so that the loss due to the background radiation effect of the separated emission energy of the beta nuclide to be measured is minimized.

The energy measuring unit may measure the radioactivity of the beta nuclide to be measured by adjusting the amplification degree of the main amplifier according to the main amplifier amplification degree adjustment equation expressed by Equation 1 below.

<Equation 1>

: 계측 효율도(%), T: 배경방사능과 샘플 측정시간(sec), MDA: 측정대상 베타 핵종의 최소검출농도(Bq/g),

: 샘플질량(g),

: 배경방사능 계수율(cps))(

: Measurement efficiency (%), T: Background activity and sample measurement time (sec), MDA: Minimum detected concentration of beta nuclides to be measured (Bq/g),

: sample mass (g),

: Background radiation counting rate (cps))

In order to achieve the above object, the beta nuclide measurement method considering the beta nuclide characteristics according to the technical idea of the present invention is a radiation collection step of collecting liquid radiation from an underwater field in the radiation collection unit, and in the measurement target separation unit A measurement target separation step of separating the measurement target beta nuclide from the collected liquid radiation by performing a pre-treatment in consideration of the type of the measurement target beta nuclide on the collected liquid radiation; It may include an energy measuring step of measuring the radioactivity of the beta nuclide to be measured by adjusting the amplification degree of the main amplifier according to the emission energy size of the separated beta nuclide to be measured.

In the step of separating the measurement target, when the target beta nuclide is all beta, physical filtering is performed on the collected liquid radiation to perform pretreatment, and then the total beta can be separated from the collected liquid radiation. have.

In the measurement target separation step, when the measurement target beta nuclide is tritium, the suspended particle removal step of removing the suspended particles in the collected liquid radiation in the suspended particle removal unit, the suspended particles in the residual chlorine and organic matter removal unit Residual chlorine and organic matter removal step of removing residual chlorine and organic matter in the liquid emission from which has been removed, and a metal ion and salt removing unit for removing metal ions and salt in the liquid emission from which the residual chlorine and organic matter are removed Ion and salt removal step, residual ion removal step of removing residual ions in the liquid radiation from which the metal ions and salt are removed by the residual ion removal unit, the liquid radiation from which the residual ions are removed by the microorganism and particle removal unit After pre-treatment, including a step of removing microorganisms and particles to remove microorganisms and particles within, tritium may be separated from the collected liquid emission.

m 필터라 할 수 있다.At this time, the suspended particle removal unit is an MF filter (Micro Filteration), the residual chlorine and organic matter removal unit is an AC filter (Activated Carbon), and the metal ion and salt removal unit is an RO membrane filter (Reverse Osmosis Membrane), and the residual ions The removal unit is a mixed bed ion exchange resin for ultrapure water, and the microorganism and particle removal unit is 0.2

m filter.

In the energy measuring step, the radioactivity of the target beta nuclide may be measured by adjusting the amplification degree of the main amplifier so that the loss due to the influence of background radiation is minimized in the emission energy of the separated beta nuclide to be measured.

In the energy measuring step, the radioactivity of the beta nuclide to be measured may be measured by adjusting the amplification degree of the main amplifier according to the main amplifier amplification degree adjustment equation expressed by Equation 1 below.

<Equation 1>

: 계측 효율도(%), T: 배경방사능과 샘플 측정시간(sec), MDA: 측정대상 베타 핵종의 최소검출농도(Bq/g),

: 샘플질량(g),

: 배경방사능 계수율(cps))(

: Measurement efficiency (%), T: Background activity and sample measurement time (sec), MDA: Minimum detected concentration of beta nuclides to be measured (Bq/g),

: sample mass (g),

: Background radiation counting rate (cps))

According to the beta-nuclide measurement system and method in consideration of the beta-nuclide characteristics as described above,

First, the present invention has the effect of enabling more reliable measurement by making different measurement conditions in consideration of the characteristics of the beta nuclide to be measured.

Second, the present invention has the effect of realizing customized measurement technology for each measurement target through pre-processing capable of separating and measuring nuclides, rather than simply increasing the efficiency of the measurement system.

Third, the present invention has the effect of measuring the effect of only tritium through a pretreatment technique applicable to seawater as well as water samples.

Fourth, the present invention separates tritium through the introduction of pre-treatment equipment, which is an ultrapure water production device, in order to effectively detect low-energy beta nuclides, particularly tritium, and adjusts the amplification degree of the main amplifier among measuring equipment for measuring low-energy beta nuclides. It has the effect of efficiently performing the measurement of radionuclides versus radioactivity.

m 필터를 사용하여 순수를 제조할 수 있는 효과를 가진다.Fifth, the present invention is an MF filter, AC filter, RO membrane filter, mixed bed ion exchange resin for ultrapure water, 0.2

It has the effect of producing pure water using the m filter.

Sixth, the present invention has the effect that it can be used as a means of securing radiological safety through the application of a water sample of a nuclear facility or groundwater of a nuclear power plant decommissioning site.

1 is a block diagram showing a beta-nuclide measuring system in consideration of the beta-nuclide characteristics according to an embodiment of the present invention.
FIG. 2 is a configuration diagram illustrating the measurement target separation unit 200 according to FIG. 1 .
Figure 3 is a flow chart of the ultrapure water production apparatus for the separation of tritium according to an embodiment of the present invention.
4 is a flowchart illustrating a method for measuring beta-nuclide in consideration of the characteristic of beta-nuclide according to an embodiment of the present invention.
5 is a flowchart illustrating a measurement target separation step (S200) according to FIG. 4 .
6 is a view showing the results of signals measured while changing the amplification degree of the main amplifier according to an embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings. The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to describe his invention in the best way. It should be interpreted with the corresponding meaning and concept. In addition, it should be noted that, when it is determined that the detailed description of known functions and configurations related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof is omitted.

1 is a block diagram showing a beta-nuclide measuring system in consideration of the beta-nuclide characteristics according to an embodiment of the present invention.

Referring to FIG. 1 , the beta-nuclide measurement system in consideration of the beta-nuclide characteristic according to an embodiment of the present invention may largely include a radiation collection unit 100 , a measurement target separation unit 200 , and an energy measurement unit 300 . have.

The radiation collection unit 100 may collect liquid radiation from the underwater field. This is to collect a sample containing the beta nuclide to be measured, and it can be said to be a component for sampling.

Considering the presence of various substances other than radioactive pollutants in the groundwater and seawater around nuclear facilities, the collected water, which is expected to be radioactively contaminated, may limit the radiation to be measured as liquid radiation.

The measurement target separation unit 200 performs pre-processing in consideration of the type of the measurement target beta nuclide on the liquid radiation collected from the radiation collection unit 100 , and collects the measurement target beta nuclide from the radiation collection unit 100 . can be separated. This can be said to be a component that enables more reliable measurement by different measurement conditions in consideration of the characteristics of the beta nuclide to be measured.

In more detail, the measurement target separation unit 200 performs physical filtering on the liquid radiation collected from the radiation collection unit 100 and performs pretreatment on the liquid collected from the radiation collection unit 100 when the target beta nuclide is pre-beta. Total beta can be isolated from sexual emissions. This can be said to be a feature for removing suspended matter and organic matter in the liquid radiation collected from the radiation collection unit 100 .

The measurement target separation unit 200 may pre-process only by physical fertilization when the measurement target beta nuclide is pre-beta.

Liquid radiation, for example, radiation such as groundwater, may contain various components such as rust residues, suspended solids, organic materials, heavy metals, microorganisms, and ionic materials. In the case of microorganisms, there may be eubacteria, archaea, and fungi, and in the case of plankton, there may be phytoplankton, zooplankton, protists, microalgae, and the like. Suspended substances are solid substances that exist in the form of fine particles in a liquid. In natural water, they are small particles with a particle diameter of 2 mm or less that are mainly generated by clay minerals and can be defined as substances that do not dissolve in water and float.

In order to measure the total beta in the liquid emission, pretreatment can be performed focusing on the removal of suspended matter and organic matter in the liquid. This pre-treated liquid radiation can measure radioactivity in a short time by maximizing the efficiency of the main amplifier in the detection system (at this time, applying appropriate amplification rather than increasing the efficiency of the measurement system).

Meanwhile, the measurement target separation unit 200 may refer to FIGS. 2 and 3 when the measurement target beta nuclide is tritium.

2 is a block diagram illustrating the measurement target separation unit 200 according to FIG. 1 , and FIG. 3 is a flowchart of an ultrapure water production apparatus for tritium separation according to an embodiment of the present invention.

As shown in FIG. 2 , when the beta nuclide to be measured is tritium, the measurement target separation unit 200 includes a suspended particle removal unit 210 , a residual chlorine and organic matter removal unit 230 , and a metal ion and salt removal unit. After pre-processing the liquid radiation collected from the radiation collection unit 100 including the 250 , the residual ion removal unit 270 , and the microorganism and particle removal unit 290 , the radiation collection unit 100 . Tritium can be separated from the collected liquid emissions.

Beta-rays may have a different thickness of a permeable medium depending on their energy. In particular, in the case of tritium, which has a very low energy, the maximum energy of the emitted beta-ray is 18.6 keV, and the specificity in the atmosphere at the maximum energy is about 10 mm, and at the average energy of 5.7 keV, it is only a few mm. In a state where such tritium is mixed with other nuclides, it is difficult to evaluate the effect of tritium.

Therefore, since separating tritium from other nuclides is beneficial in terms of measurement, it is a water purification system that can obtain pure water samples through the application of filters such as membranes and reverse osmosis, rather than chemical methods that generate secondary waste. It may be necessary to separate only the tritium.

In addition, various substances other than radioactive contaminants exist in the groundwater and seawater around nuclear facilities. These substances may adversely affect durability by causing corrosion and oxidation in the detection part where the water sample and the scintillator are in direct contact. It can also cause a decrease in optical efficiency for radioactivity analysis. Accordingly, in the case of tritium having an extremely short amorphous crystal, it can be said that it is efficient to separate and measure after removing impurities.

을 고려할 수 있다.In addition, a large amount of cooling water is inevitably required for the operation of a nuclear power plant, and hot wastewater is inevitably discharged into the surrounding sea as a product of the operation of the power plant. Accordingly, various microorganisms and salts may exist in seawater. In the case of seaweed, macroalgae (red algae, green algae, brown algae), halophytes, and seaweed plants may exist. In the case of marine plankton, phytoplankton, zooplankton, protists, and sea flowering plants may exist. In the case of marine microorganisms, eubacteria, archaea, fungi, etc. exist, and other suspended substances may exist. In the case of salt, an ion concentration of 100 ppm or more is defined as a major ion,

can be considered.

As shown in FIG. 3 , the suspended particle removal unit 210 to the microorganism and particle removal unit 290 can measure the effect of only tritium through a pretreatment technique applicable not only to water samples, but also to sea water. These are the components that make it possible.

m에서 1

m의 크기를 갖는 실리카, 클레이, 효모, 박테리아와 같은 대부분의 부유입자를 제거하기 위한 구성요소라 할 수 있다.The suspended particle removal unit 210 may remove the suspended particles in the liquid radiation collected from the radiation collection unit 100 . In this case, an MF filter (Micro Filteration) may be used as the suspended particle removal unit 210 . It is 0.05 to 0.1

1 in m

It can be said to be a component for removing most suspended particles such as silica, clay, yeast, and bacteria having a size of m.

The residual chlorine and organic matter removal unit 230 may remove residual chlorine and organic matter in the liquid radiation from which the suspended particles are removed from the suspended particle removal unit 210 . In this case, an AC filter (activated carbon) may be used as the residual chlorine and organic matter removal unit 230 . This can be said to be a component for removing dissolved organic matter or particulate matter. AC filter can also be used as a pretreatment of ion exchange resin to remove residual chlorine and organic matter, which greatly affect the performance degradation of ion exchange resin.

) 대부분을 제거하기 위한 구성요소라 할 수 있다.The metal ion and salt removal unit 250 may remove metal ions and salt in the liquid radiation from which the residual chlorine and organic matter have been removed from the residual chlorine and organic material removal unit 230 . In this case, as the metal ion and salt removal unit 250 , an RO membrane filter (Reverse Osmosis Memvrane) may be used. It allows water to pass through but hardly passes through ions or molecules dissolved in water, so that ions (

) can be said to be a component to remove most of them.

The residual ion removal unit 270 may remove residual ions in the liquid radiation from which metal ions and salts have been removed from the metal ions and salt removal unit 250 . In this case, a mixed bed type ion exchange resin for ultrapure water may be used as the residual ion removal unit 270 . This is a component for reducing salt content and obtaining pure liquid with high purity by removing residual ions in liquid radiation.

m 필터를 사용할 수 있다. 이는 최종적으로 미생물 및 입자를 한 번 더 제거하기 위한 구성요소라 할 수 있다.The microorganism and particle removal unit 290 may remove microorganisms and particles in the liquid radiation from which residual ions are removed from the residual ion removal unit 270 . At this time, the microorganism and particle removal unit 290 is 0.2

m filter can be used. This can be said to be a component for finally removing microorganisms and particles once more.

As such, for the measurement of tritium, which is a low-energy beta nuclide, separation from other nuclides can be performed. In order to remove suspended matter in the liquid radiation, filtration is performed using activated carbon and a membrane filter, and ions in the liquid radiation can be removed using an ion exchange resin and a reverse osmosis filter. If all ions and particles in the liquid emission are removed, pure water is produced, and it can be said that the pretreatment conditions that can measure only the effect of tritium can be completed.

The energy measuring unit 300 may measure the radioactivity of the measuring target beta nuclide by adjusting the amplification degree of the main amplifier according to the emission energy size of the measuring target beta nuclide separated from the measuring target separating unit 200 .

In more detail, the energy measuring unit 300 adjusts the amplification degree of the main amplifier so that the emission energy of the beta nuclide to be measured separated from the separation unit 200 to be measured is minimized due to the influence of the background radiation. radiation can be measured. This can also be said to be a characteristic in consideration of the characteristics of the target beta nuclide.

In the case of low-energy beta rays generated from tritium, it is possible to increase the amplification of the main amplifier and measure it with a difference from the background radiation, thereby enabling efficient radioactivity measurement. On the other hand, in the case of other beta nuclides with relatively high energy, stable measurement can be performed in a state with low background radiation through the application of an appropriate amplification level. This is because, rather than simply increasing the efficiency of the measurement system, it is possible to implement customized measurement technology for each measurement target through pre-processing that can reduce the background.

To this end, the energy measuring unit 300 may measure the radioactivity of the beta nuclide to be measured by adjusting the amplification level of the main amplifier according to the main amplifier amplification degree adjustment equation expressed by Equation 1 below.

<Equation 1>

: 계측 효율도(%), T: 배경방사능과 샘플 측정시간(sec), MDA: 측정대상 베타 핵종의 최소검출농도(Bq/g),

: 샘플질량(g),

: 배경방사능 계수율(cps))(

: Measurement efficiency (%), T: Background activity and sample measurement time (sec), MDA: Minimum detected concentration of beta nuclides to be measured (Bq/g),

: sample mass (g),

: Background radiation counting rate (cps))

The output of the light signal generated by the reaction between the radiation and the scintillator may vary depending on the energy of the radiation. In addition, it is essential to distinguish it from background radiation, which is basically generated when measuring radiation.

In the case of low-energy beta rays generated from tritium, the amplification level of the main amplifier is increased and the difference from the background radiation is measured. Efficient radioactivity analysis can be performed by performing measurement, and an objective formula for this can be referred to as Equation 1 above.

In the case of tritium, which is a low energy, stable measurement can be performed by maximally applying the amplification of the main amplifier to increase the generated output value. Conversely, for beta nuclides with relatively high energy, that is, total beta, the amplification level of the main amplifier under the condition that the background radiation does not increase can be applied to enable efficient monitoring of beta nuclides.

The self-disposal concentration of strontium is 1Bq/g, and the efficiency of the equipment to reach the MDA of 0.1Bq/g, which is 1/10 of this level, is derived according to the MDA calculation formula. It can be calculated by putting the volume value of .

In this case, all betas can be said to be all betanuclides. Among them, strontium is used as a representative high-energy beta nuclide, and since strontium has the highest self-disposal concentration among beta nuclides, strontium may be used as a target in this embodiment.

When rapid measurement in the field is defined as a measurement time of 5 seconds and measurement efficiency to satisfy this condition is derived, the measurement efficiency value that can be quickly measured in the field because the case of coarse gain 40 satisfies the condition can be used as Equation 1.

4 is a flowchart illustrating a method for measuring beta-nuclide in consideration of the characteristic of beta-nuclide according to an embodiment of the present invention.

Referring to FIG. 4 , the beta nuclide measuring method in consideration of the beta nuclide characteristics according to an embodiment of the present invention may largely include a radiation collection step (S100), a measurement target separation step (S200) and an energy measurement step (S300). have.

The radiation collection step may collect liquid radiation from the underwater field in the radiation collection unit 100 (S100). This is to collect a sample containing the beta nuclide to be measured, which can be referred to as a sampling step.

Considering the presence of various substances other than radioactive pollutants in the groundwater and seawater around nuclear facilities, the collected water, which is expected to be radioactively contaminated, may limit the radiation to be measured as liquid radiation.

In the measurement target separation step, the measurement target separation unit 200 performs a pre-processing in consideration of the type of the measurement target beta nuclide for the liquid radiation collected from the radiation collection step (S100), and collects the radiation (S100) A beta nuclide to be measured can be separated from (S200). This can be said to be a step to enable more reliable measurement by making different measurement conditions in consideration of the characteristics of the beta nuclide to be measured.

In more detail, in the measurement target separation step ( S200 ), when the target beta nuclide is all beta, the liquid collected after pretreatment by performing physical filtering on the liquid radiation collected from the radiation collection step ( S100 ) Total beta can be isolated from sexual emissions. This can be said to be a feature for removing suspended matter and organic matter in the liquid radiation collected from the radiation collection step (S100).

In the measurement target separation step (S200), when the target beta nuclide is pre-beta, pretreatment may be performed only by physical fertilization.

Meanwhile, in the measurement target separation step ( S200 ), when the measurement target beta nuclide is tritium, reference may be made to FIG. 5 .

FIG. 5 is a flowchart illustrating the step of separating a measurement target according to FIG. 4 ( S200 ).

As shown in FIG. 5 , when the beta nuclide to be measured is tritium, the measurement target separation step (S200) is a suspended particle removal step (S210), a residual chlorine and organic matter removal step (S230), a metal ion and salt removal step After pretreatment of the liquid radiation collected from the radiation collection step (S100), including the step (S250), the removal of residual ions (S270), the step of removing microorganisms and particles (S290), from the radiation collection step (S100) Tritium can be separated from the collected liquid emissions.

In more detail, the suspended particle removal step (S210) to the microorganism and particle removal step (S290) is a component that allows measurement of the effect of only tritium through a pretreatment technology applicable not only to water samples but also to sea water. can be said to be

m에서 1

m의 크기를 갖는 실리카, 클레이, 효모, 박테리아와 같은 대부분의 부유입자를 제거하기 위한 단계라 할 수 있다.The floating particle removal step may remove the suspended particles in the liquid radiation collected from the radiation collection step (S100) in the floating particle removal unit 210 (S210). In this case, in the step of removing suspended particles ( S210 ), an MF filter (Micro Filteration) may be used. It is 0.05 to 0.1

1 in m

It can be said to be a step to remove most suspended particles such as silica, clay, yeast, and bacteria having a size of m.

The residual chlorine and organic matter removal step may remove residual chlorine and organic matter in the liquid emission from which the suspended particles are removed from the suspended particle removal step (S210) in the residual chlorine and organic matter removal unit 230 (S230). In this case, an AC filter (activated carbon) may be used in the residual chlorine and organic matter removal step (S230). This may be referred to as a step for removing dissolved organic matter or particulate matter. AC filter can also be used as a pretreatment of ion exchange resin to remove residual chlorine and organic matter, which greatly affect the performance degradation of ion exchange resin.

) 대부분을 제거하기 위한 단계라 할 수 있다.The metal ion and salt removal step may remove metal ions and salts in the liquid radiation from which the residual chlorine and organic matter are removed from the residual chlorine and organic matter removal step (S230) in the metal ion and salt removal unit 250 (S250). ). In this case, in the metal ion and salt removal step (S250), an RO membrane filter (Reverse Osmosis Memvrane) may be used. It allows water to pass through but hardly passes through ions or molecules dissolved in water, so that ions (

) can be said to be a step to remove most of them.

The residual ion removal step may remove the residual ions in the liquid radiation from which the metal ions and salts are removed from the metal ions and salt removal step (S250) in the residual ion removal unit 270 (S270). In this case, in the residual ion removal step (S270), a mixed bed type ion exchange resin for ultrapure water may be used. This is a step to reduce salt content and obtain pure liquid with high purity by removing residual ions in liquid radiation.

m 필터를 사용할 수 있다. 이는 최종적으로 미생물 및 입자를 한 번 더 제거하기 위한 단계라 할 수 있다.In the microorganism and particle removal step, the microorganism and particle removal unit 290 may remove microorganisms and particles in the liquid radiation from which residual ions are removed from the residual ion removal step (S270) (S290). At this time, in the microorganism and particle removal step (S290), 0.2

m filter can be used. This may be a step for finally removing microorganisms and particles once more.

In the energy measuring step, the energy measuring unit 300 measures the radioactivity of the measuring target beta nuclide by adjusting the amplification degree of the main amplifier according to the emission energy size of the measuring target beta nuclide separated from the measuring target separating step (S200). (S300).

In more detail, the energy measurement step (S300) is performed by adjusting the amplification degree of the main amplifier so that the emission energy of the beta nuclide to be measured separated from the separation step (S200) of the measurement target is minimized due to the influence of background radiation. radiation can be measured. This can also be said to be a characteristic in consideration of the characteristics of the target beta nuclide.

In the case of low-energy beta rays generated from tritium, it is possible to increase the amplification of the main amplifier and measure it with a difference from the background radiation, thereby enabling efficient radioactivity measurement. On the other hand, in the case of other beta nuclides with relatively high energy, stable measurement can be performed in a state with low background radiation through the application of an appropriate amplification level. This is because, rather than simply increasing the efficiency of the measurement system, it is possible to implement customized measurement technology for each measurement target through pre-processing that can reduce the background.

To this end, in the energy measuring step (S300), the radioactivity of the beta nuclide to be measured may be measured by adjusting the amplification degree of the main amplifier according to the main amplifier amplification degree adjustment equation expressed by Equation 1 below.

<Equation 1>

: 계측 효율도(%), T: 배경방사능과 샘플 측정시간(sec), MDA: 측정대상 베타 핵종의 최소검출농도(Bq/g),

: 샘플질량(g),

: 배경방사능 계수율(cps))(

: Measurement efficiency (%), T: Background activity and sample measurement time (sec), MDA: Minimum detected concentration of beta nuclides to be measured (Bq/g),

: sample mass (g),

: Background radiation counting rate (cps))

6 is a view showing the results of signals measured while changing the amplification degree of the main amplifier according to an embodiment of the present invention.

In order to derive the result of FIG. 6 , the present invention is an embodiment, and it is possible to implement pretreatment equipment applicable to seawater as well as a filtering process using a membrane filter for pretreatment of a water sample (liquid radiation) around a nuclear facility. . A membrane-based pure water production apparatus can be designed around a reverse osmosis process that removes ions in a water sample.

The reverse osmosis process can be said to be a process for producing pure water by applying a high pressure to the RO (Reverse Osmosis) membrane. In this case, the RO membrane can use Toray Chemical's RE4040-SHN, 40".

A booster pump can be installed in the facility to apply high pressure to the reverse osmosis membrane. In this case, the booster pump can use SPECK's D-91154 Roth.

m을 사용할 수 있고, AC 필터는 한연산업의 BDC Cartridge filter 20”을 사용할 수 있다. 초순수용 혼상식 이온교환수지는 THERMAX, TULSION MB-115, 25L을 사용할 수 있고, 0.2

m 필터는 한연산업의 MP Cartridge filter, 10“을 사용할 수 있다.Membrane used in the reverse osmosis process may cause membrane fouling due to suspended solids, colloids, organic/inorganic compounds, biological growth, and the like. Therefore, MF filter and AC filter can be used as pretreatment to prevent deterioration of RO membrane performance. At this time, the MF filter is Hanyeon Industrial’s BDS Cartridge filter, 20“, 1

m can be used, and for the AC filter, Hanyeon Industrial’s BDC Cartridge filter 20” can be used. The mixed bed ion exchange resin for ultrapure water can use THERMAX, TULSION MB-115, 25L, and 0.2

For the m filter, Hanyeon Industrial's MP Cartridge filter, 10" can be used.

6(a) to 6(d) show the amplification levels of the main amplifier of 10 (Fig. 6(a)), 20 (Fig. 6(b)), 40 (Fig. 6(c)), 100 (Fig. 6(c)), respectively. d)) and it can be said to be the result value of the measured signal.

A value measured in the form of a central peak can be said to be a signal of light generated by radiation. And it can be said that the values measured widely in the vicinity are generated and measured by light for reasons other than ambient radiation or radiation. When the amplification degree of the main amplifier is increased, it can be seen that not only the value due to radiation increases, but also the surrounding values also increase.

Since the background activity affects the minimum detection limit that determines the precision of the measurement, it may be necessary to optimize the conditions in which the value due to the radionuclide appears high but the value due to the background activity is small.

)와 스트론튬-90(

) 선원의 주증폭기의 증폭도 변화에 따른 측정 결과라 할 수 있다.On the other hand, Table 1 below shows the background activity (BKG), tritium (

) and strontium-90 (

) It can be said that it is the measurement result according to the change in the amplification degree of the main amplifier of the source.

<Table 1>

Referring to Table 1, in the case of background radiation (BKG), it can be seen that the counting rate increases as the amplification degree increases, and in particular, the largest amount of change can be confirmed as it changes from 40 to 100.

)의 경우 증폭도가 증가함에 따라 계수율이 증가하며, 마찬가지로 40에서 100으로 변화되면서 증가량이 가장 큰 것을 확인할 수 있다.tritium (

), the counting rate increases as the amplification level increases, and it can be seen that the increase is the largest as it changes from 40 to 100.

)의 경우도 삼중수소와 배경방사능과 비슷한 결과를 보이지만, 40에서 100으로 변화될 때 증가량이 상대적으로 적은 것을 확인할 수 있다.strontium-90 (

) also shows similar results to tritium and background radiation, but it can be seen that the increase is relatively small when changing from 40 to 100.

)의 경우 증폭도 100, 스트론튬-90(

)의 경우 증폭도 40의 값을 사용하여 측정할 수 있다.Therefore, to minimize the value due to background radiation, and to measure the maximum

), amplification degree 100, strontium-90 (

), the amplification degree can be measured using the value of 40.

Through this, the present invention can enable efficient measurement and monitoring by applying measurement conditions according to the beta emission energy of short-range beta-nuclides in a water sample, including tritium, which is an extremely low-energy emission nuclide.

Although described and illustrated in relation to a preferred embodiment for illustrating the technical idea of the present invention above, the present invention is not limited to the configuration and operation as shown and described as such, and deviates from the scope of the technical idea. It will be apparent to those skilled in the art that many changes and modifications can be made to the invention without reference to the invention. Accordingly, all such suitable changes and modifications are to be considered as falling within the scope of the present invention.

100: radiation collection unit 200: measurement target separation unit
210: suspended particle removal unit 230: residual chlorine and organic matter removal unit
250: metal ion and salt removal unit 270: residual ion removal unit
290: microorganism and particle removal unit 300: energy measuring unit

Claims (12)

Radiation collection unit for collecting liquid radiation from the underwater field;
a measurement target separation unit for separating the measurement target beta nuclide from the collected liquid radiation by performing pre-processing in consideration of the type of the measurement target beta nuclide on the collected liquid radiation; and
and an energy measuring unit for measuring the radioactivity of the beta nuclide to be measured through control of the amplification degree of the main amplifier according to the emission energy of the separated beta nuclide to be measured;
The energy measuring unit,
Measuring the radioactivity of the beta nuclide to be measured by adjusting the amplification degree of the main amplifier so that the release energy of the separated beta nuclide to be measured is minimized due to the effect of background radiation,
The energy measuring unit,
A beta nuclide measurement system in consideration of the beta nuclide characteristic of measuring the radioactivity of the target beta nuclide by controlling the amplification degree of the main amplifier according to the main amplifier amplification degree adjustment equation expressed by Equation 1 below.
<Equation 1>

(

: Measurement efficiency (%), T: Background activity and sample measurement time (sec), MDA: Minimum detected concentration of beta nuclides to be measured (Bq/g),

: sample mass (g),

: Background radiation counting rate (cps)) According to claim 1, wherein the measurement target separation unit,
When the beta nuclide to be measured is all beta,
A beta nuclide measurement system in consideration of the characteristics of beta nuclide that separates all beta from the collected liquid radiation after physical filtering is performed on the collected liquid radiation and pretreatment. According to claim 1, wherein the measurement target separation unit,
When the target beta nuclide is tritium,
a suspended particle removal unit for removing suspended particles in the collected liquid radiation;
Residual chlorine and organic matter removal unit for removing residual chlorine and organic matter in the liquid radiation from which the suspended particles are removed;
a metal ion and salt removal unit for removing metal ions and salts in the liquid radiation from which residual chlorine and organic matter are removed;
a residual ion removal unit for removing residual ions in the liquid radiation from which the metal ions and salts have been removed; and
After pretreatment including; a microorganism and particle removal unit for removing microorganisms and particles in the liquid radiation from which the residual ions are removed; nuclide measurement system. 4. The method of claim 3,
The suspended particle removal unit is an MF filter (Micro Filteration),
The residual chlorine and organic matter removal unit is an AC filter (Activated Carbon),
The metal ion and salt removal unit is an RO membrane filter (Reverse Osmosis Membrane),
The residual ion removal unit is a mixed-bed ion exchange resin for ultrapure water,
The microorganism and particle removal unit is 0.2

Beta nuclide measurement system considering the characteristics of beta nuclide as an m filter. delete delete A radiation collection step of collecting liquid radiation from the underwater field in the radiation collection unit;
a measurement target separation step of separating the measurement target beta nuclide from the collected liquid radiation by performing pre-processing in consideration of the type of the measurement target beta nuclide on the collected liquid radiation in the measurement target separation unit; and
An energy measuring step of measuring the radioactivity of the target beta nuclide by adjusting the amplification degree of the main amplifier according to the emission energy size of the separated beta nuclide to be measured in the energy measuring unit;
The energy measurement step is,
Measuring the radioactivity of the target beta nuclide by adjusting the amplification degree of the main amplifier so that the release energy of the separated beta nuclide to be measured is minimized due to the effect of background radiation,
The energy measurement step is,
A beta-nuclide measurement method in consideration of the beta-nuclide characteristic of measuring the radioactivity of the target beta-nuclide by controlling the amplification degree of the main amplifier according to the main amplifier amplification degree adjustment equation expressed by Equation 1 below.
<Equation 1>

(

: Measurement efficiency (%), T: Background activity and sample measurement time (sec), MDA: Minimum detected concentration of beta nuclides to be measured (Bq/g),

: sample mass (g),

: Background radiation counting rate (cps)) The method of claim 7, wherein the separation of the measurement object comprises:
When the beta nuclide to be measured is all beta,
A method for measuring beta nuclides in consideration of the characteristics of beta nuclide in which all beta is separated from the collected liquid radiation after physical filtering is performed on the collected liquid radiation and pretreatment. The method of claim 7, wherein the separation of the measurement object comprises:
When the target beta nuclide is tritium,
A suspended particle removal step of removing the suspended particles in the collected liquid radiation in the floating particle removal unit;
Residual chlorine and organic matter removal step of removing residual chlorine and organic matter in the liquid emission from which the suspended particles are removed in the residual chlorine and organic matter removal unit;
a metal ion and salt removal step of removing metal ions and salts in the liquid radiation from which the residual chlorine and organic matter are removed in the metal ion and salt removal unit;
Residual ion removal step of removing residual ions in the liquid radiation from which the metal ions and salts have been removed by the residual ion removal unit; and
After pre-treatment including; removing the microorganisms and particles in the liquid radiation from which the residual ions are removed in the microorganism and particle removal unit, to separate tritium from the collected liquid radiation Beta nuclide measurement method considering the characteristics of beta nuclide. 10. The method of claim 9,
The suspended particle removal unit is an MF filter (Micro Filteration),
The residual chlorine and organic matter removal unit is an AC filter (Activated Carbon),
The metal ion and salt removal unit is an RO membrane filter (Reverse Osmosis Membrane),
The residual ion removal unit is a mixed-bed ion exchange resin for ultrapure water,
The microorganism and particle removal unit is 0.2

Beta nuclide measurement method considering the characteristics of beta nuclide, which is an m filter. delete delete

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