CN115436985A - Total beta and total gamma on-line monitoring system in water - Google Patents
Total beta and total gamma on-line monitoring system in water Download PDFInfo
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- CN115436985A CN115436985A CN202210922115.0A CN202210922115A CN115436985A CN 115436985 A CN115436985 A CN 115436985A CN 202210922115 A CN202210922115 A CN 202210922115A CN 115436985 A CN115436985 A CN 115436985A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/1603—Measuring radiation intensity with a combination of at least two different types of detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/203—Measuring radiation intensity with scintillation detectors the detector being made of plastics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/208—Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/24—Measuring radiation intensity with semiconductor detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/24—Measuring radiation intensity with semiconductor detectors
- G01T1/244—Auxiliary details, e.g. casings, cooling, damping or insulation against damage by, e.g. heat, pressure or the like
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Abstract
The invention relates to an online monitoring system for total beta and total gamma in water, which comprises a sample pipeline, a sampling unit, a concentration unit, a measurement unit and a standard solution supply unit, wherein the sampling unit is sequentially arranged on the sample pipeline; the measuring unit comprises a container for containing the concentrated solution, a first detection mechanism for detecting the total beta gamma activity concentration in the concentrated solution, a second detection mechanism for detecting the total gamma activity concentration in the concentrated solution and a data acquisition unit; the monitoring system has reasonable structural design and high detection accuracy, can realize unattended operation, is stable and reliable by the cooperation control of system programs, and is suitable for monitoring total beta and gamma nuclides in water.
Description
The application is a divisional application of an invention patent application with the application date of 2020, 6 and 23 days and the application number of 202010577578.9, and the invention name of the invention is 'an on-line monitoring device for total beta and total gamma in water and a calculation method for activity and concentration of total beta and total gamma in water'.
Technical Field
The invention belongs to the field of environmental detection, and particularly relates to an on-line monitoring system for total beta and total gamma in water.
Background
During the operation of nuclear facilities, a large amount of beta nuclide and gamma nuclide are generated, released into the environment in a liquid state, enter a biosphere through ecological cycle and further enter a human body to cause irradiation damage. The national standard GB14587-2011 states "sampled monitoring and on-line continuous monitoring of radioactive liquid effluents from nuclear power plants. Although the discharge ports of the liquid effluents of the nuclear power plant are provided with the online total gamma continuous monitoring system, the device still has great environmental damage after discharge due to the detection limit of 4Bq/L, and the nuclear power plant is not provided with the total beta continuous monitoring system.
The traditional total gamma measurement adopts a sodium iodide detector, the energy resolution of the detector is extremely poor, specific nuclides are difficult to distinguish, the specific nuclides need to be distinguished, sampling analysis needs to be carried out, the operation is relatively complex, the consumed time is extremely long, and a large amount of manpower and material resources need to be consumed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an on-line monitoring system for total beta and total gamma in water.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a total beta and total gamma on-line monitoring system in aquatic, monitoring system includes the sample pipeline and locates the sampling unit on the sample pipeline in proper order, a concentration unit for carrying out ion concentration to the water sample that the sampling unit was got, carry out measuring unit to total beta in the concentration liquid and total gamma's activity concentration, measuring unit is including the household utensils that hold the concentration liquid, a first detection mechanism for detecting total beta gamma activity concentration in the concentration liquid, a second detection mechanism for detecting total gamma activity concentration in the concentration liquid, a data collection station.
Preferably, the first detection mechanism comprises a plastic scintillator detector which can be in direct contact with the concentrated solution and detect total beta gamma rays in the concentrated solution, and a first photomultiplier tube which amplifies and converts a detection signal of the plastic scintillator detector into an electric signal.
Preferably, the first detection mechanism further comprises a high-purity germanium detector arranged close to the vessel and used for detecting total gamma rays in the concentrated liquid in the vessel, and a second photomultiplier tube used for amplifying and converting detection signals of the high-purity germanium detector into electric signals.
Preferably, the concentration unit comprises a first-stage concentration mechanism, a second-stage concentration mechanism and a third-stage concentration mechanism which sequentially perform ion concentration on the obtained water sample.
Preferably, each stage of concentration mechanism comprises a permeable membrane module, a first pressure sensor and a second pressure sensor which are arranged at the upstream and the downstream of the permeable membrane module, and a pressure increasing valve arranged at the upstream of the first pressure sensor.
Preferably, the sampling unit comprises a water pump, a filter, a first liquid mass flowmeter and a second liquid mass flowmeter which are arranged on the sample pipeline, the water pump, the filter and the first liquid mass flowmeter are sequentially arranged, and the second liquid mass flowmeter is positioned between the concentration unit and the measuring unit.
Preferably, the monitoring system further comprises a standard solution supply unit for providing a standard solution to calculate the detection efficiency of the measurement unit after the measurement unit detects the standard solution, the standard solution supply unit comprises a reagent bottle for containing the standard solution, a supply pipe for communicating the reagent bottle with the sample pipeline, and a third liquid mass flow meter arranged on the supply pipe, and the joint of the supply pipe and the sample pipeline is positioned between the concentration unit and the first liquid mass flow meter.
The invention also relates to a method for calculating the concentration of total beta and total gamma activities in water, which adopts the data information obtained during monitoring by the monitoring system described in the invention to calculate, wherein the data information obtained during monitoring comprises the counting rate n of the high-purity germanium detector γ (ii) a Background count rate n of high-purity germanium detector γ0 (ii) a Third liquid mass flowmeter measuring volume V 3 (ii) a Counting rate n of plastic scintillator detector s (ii) a Background count rate n of plastic scintillator detector s0 (ii) a Plastic scintillator detector measures gamma-ray count rate n β (ii) a Volume V of the first liquid mass flowmeter 1 (ii) a Volume V of second liquid mass flowmeter 2 (ii) a Background measurement time t 0 ；c β Is beta activity concentration in standard solution; c. C |γ Is the gamma activity concentration in the standard solution.
Preferably, the calculation method includes the following calculation formula:
wherein epsilon γ The detection efficiency of the high-purity germanium detector is high; epsilon β The detection efficiency of the plastic scintillator detector is obtained; rho is a response factor of the plastic scintillator detector and the high-purity germanium detector;
the concentration ratio of the system is; a. The β Is the total beta activity concentration in water; a. The γ Is the total gamma activity concentration in water.
Preferably, the calculation method further includes the following calculation formula:
wherein the MDC β Measuring a detection limit for total beta in water; MDC γ The detection limit is measured for the total gamma in water.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the system for monitoring total beta and total gamma in water on line, ions in water are concentrated through the concentration unit, concentrated solution is measured by the plastic scintillator and the high-purity germanium detector respectively, activity concentrations of total beta nuclide and gamma nuclide in water are obtained through calculation, the concentration rate of the concentration unit is not lower than 40 times, the detection limit of total beta in water is as low as 1Bq/L, and the detection limit of gamma nuclide in water is as low as 0.1Bq/L; the monitoring system has reasonable structural design and high detection accuracy, can realize unattended operation, is stable and reliable by the cooperation control of system programs, and is suitable for monitoring total beta and gamma nuclides in water.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the monitoring system of the present invention;
FIG. 2 is a schematic top view of a measurement unit according to the present invention;
wherein: g10, a sample pipeline; c1, a water pump; c2, a filter; c31, a first liquid mass flowmeter; c32, a second liquid mass flowmeter; b1, reagent bottles; b2, a third liquid mass flowmeter; b3, a supply pipe; n1, a primary concentration mechanism; n2, a secondary concentration mechanism; n3, a three-level concentration mechanism; z10, a pressure increasing valve; y10, a first pressure sensor; y20, a second pressure sensor; m10, a permeable membrane; f10, a plane three-way valve; j10, ma Linbei; j1, a plastic scintillator detector; j2, a first photomultiplier tube; j3, a high-purity germanium detector; j4, a second photomultiplier.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1 to 2, an online monitoring system for total β and total γ in water includes a sample pipe g10, a sampling unit sequentially disposed on the sample pipe g10, a concentration unit for ion concentration of a water sample obtained by the sampling unit, and a measurement unit for measuring activity concentrations of total β and total γ in a concentrated solution.
Specifically, the measuring unit comprises a container (1L Ma Linbei j 10) for containing the concentrated solution, a first detection mechanism for detecting the total beta and gamma activity concentration in the concentrated solution, a second detection mechanism for detecting the total gamma activity concentration in the concentrated solution and a data acquisition unit. The first detection mechanism comprises a plastic scintillator detector j1 which can be in direct contact with the concentrated solution and detect total beta gamma rays in the concentrated solution, a first photomultiplier j2 which amplifies a detection signal of the plastic scintillator detector j1 and converts the detection signal into an electric signal, a high-purity germanium detector j3 which is arranged close to a vessel and detects the total gamma rays in the concentrated solution in the vessel, and a second photomultiplier j4 which amplifies the detection signal of the high-purity germanium detector j3 and converts the detection signal into the electric signal. 1L Ma Linbei j10 is a high-purity germanium detector j3 with the inner diameter of 85mm, the depth of about 100mm and the diameter of 83mm and the height of 100mm in a plastic material well; ma Linbei j10 well and annular plastic scintillator detector j1 are integrated, i.e. the plastic scintillator detector j1 forms the outer wall of Ma Linbei j10, and the plastic scintillator is directly contacted with the liquid to be detected.
During on-line monitoring, a high-purity germanium detector j3 power generation refrigeration unit is firstly started to refrigerate to be below minus 179 ℃, a plastic scintillator detector j1 is started, and water samples are collected for monitoring after background measurement is stable.
The plastic scintillator detector j1 measures total beta gamma rays in the liquid to be detected, signals are amplified through the first photomultiplier j2 and collected into the data collector, and the activity concentration of the total beta gamma rays in the water is calculated through software.
The high-purity germanium detector j3 is used for measuring gamma rays in the liquid to be measured, signals are amplified through the second photomultiplier j4 and are collected into the data collector, the activity concentration of gamma nuclide in water is calculated through software, a total gamma measurement result is obtained, and the activity concentration of total beta in the liquid to be measured is obtained through calculation of the obtained total gamma measurement result and the measurement result of the plastic detector.
Further, the sampling unit comprises a water pump c1, a filter c2, a first liquid mass flow meter c31 and a second liquid mass flow meter c32 which are arranged on the sample pipeline g10, the water pump c1, the filter c2 and the first liquid mass flow meter c31 are sequentially arranged, and the second liquid mass flow meter c32 is positioned between the concentration unit and the measuring unit.
The standard solution supply unit comprises a reagent bottle b1 for containing a standard solution, a supply pipe b3 for communicating the reagent bottle b1 with the sample pipeline g10, and a third liquid mass flow meter b2 arranged on the supply pipe b3, wherein the joint of the supply pipe b3 and the sample pipeline g10 is positioned between the concentration unit and the first liquid mass flow meter c31, and the joint of the supply pipe b3 and the sample pipeline g10 is provided with a plane three-way valve f10.
The method comprises the steps of controlling a plane three-way valve f10 arranged at the joint of a supply pipe b3 and a sample pipeline g10 to enable the supply pipe b3 to be communicated with a concentration unit and a measurement unit on the sample pipeline g10, quantitatively transferring total beta and gamma nuclide standard substances in a reagent bottle b1 through a third liquid mass flowmeter b2, concentrating the total beta and gamma nuclide standard substances through the concentration unit, entering the measurement unit, calibrating a plastic scintillator and a high-purity germanium detector j1 and a high-purity germanium detector j3 of the measurement unit by using a standard solution before monitoring the total beta and the total gamma in water, and calculating the detection efficiency of the plastic scintillator detector j1 and the high-purity germanium detector j 3.
Further, the concentration unit comprises a first-stage concentration mechanism n1, a second-stage concentration mechanism n2 and a third-stage concentration mechanism n3 which sequentially perform ion concentration on the obtained water sample; each stage of concentration mechanism comprises a permeable membrane component, a first pressure sensor y10 and a second pressure sensor y20 which are arranged at the upstream and the downstream of the permeable membrane component, and a pressure increasing valve z10 which is arranged at the upstream of the first pressure sensor y 10.
Each concentration mechanism comprises a first pressure sensor y10 and a second pressure sensor y20 which are positioned at the upstream and the downstream of the permeable membrane component, and through the measurement information of the first pressure sensor y10 and the second pressure sensor y20, the system can conveniently control the front-end and rear-end pressure difference of the permeable membrane m10, so that efficient water sample concentration is realized.
A water sample sequentially passes through a filter c2 and a first liquid mass flowmeter c31 and then enters a primary concentration mechanism n1, is pressurized to 300kPa through a pressurizing valve z10 of the primary concentration mechanism n1 and enters a permeable membrane component of the primary concentration mechanism n1, and low-ion water is discharged from the side surface of a permeable membrane m10 of the primary concentration mechanism n 1;
then the concentrated water concentrated by the primary concentration mechanism n1 enters a secondary concentration mechanism n2, is pressurized to 400kPa by a pressurizing valve z10 of the secondary concentration mechanism n2, enters a permeable membrane component of the secondary concentration mechanism n2, and the low-ion water is discharged from the side surface of a permeable membrane m10 of the secondary concentration mechanism n 2;
then the concentrated water concentrated by the second-stage concentration mechanism n2 enters a third-stage concentration mechanism n3, is pressurized to 500kPa by a pressurizing valve z10 of the third-stage concentration mechanism n3, enters a permeable membrane component of the third-stage concentration mechanism n3, and low-ion water is discharged from the side surface of a permeable membrane m10 of the third-stage concentration mechanism n3; the concentrated water then enters the measurement unit Ma Linbei j10 for measurement via the second liquid mass flow meter c 32.
In addition, in this example, the permeable membrane assemblies of each stage of concentration mechanism each include two permeable membranes m10 (made of cellulose acetate) arranged in parallel, inlets of the two permeable membranes m10 are communicated with the sample pipeline g10 through a planar three-way valve f10, and concentrated solution outlets of the two permeable membranes m10 are also communicated with the sample pipeline g10 through a planar three-way valve f 10; when a water sample is monitored on line, comparing the liquid volume measured by the first liquid mass flowmeter c31 with the liquid volume measured by the second liquid mass flowmeter c32, calculating to obtain the concentration ratio of the water sample in the system, automatically switching the system after the concentration ratio is lower than a set value, switching one permeable membrane m10 to another permeable membrane m10 to continue monitoring, and simultaneously giving an alarm to prompt an operator to use the permeable membrane m10 before changing and switching; when the inlet and the concentrated solution outlet of one permeable membrane m10 are communicated with the sample pipeline g10 through the planar three-way valve f10, the inlet and the concentrated solution outlet of the other permeable membrane m10 are disconnected from the sample pipeline g10, namely, the permeable membrane m10 is replaced without stopping by controlling the on-off of the planar three-way valve f10 in a one-use one-standby combination mode, and the premise is provided for the on-line continuous monitoring of a monitoring system.
In addition, the invention also relates to a method for calculating the concentration of total beta and total gamma activities in water, wherein the calculation method adopts the data information obtained when the monitoring system described by the invention monitors to calculate;
the detection efficiency of the two detectors can be respectively calculated by the formula (1) and the formula (2) through the third liquid mass flowmeter b2, the plastic scintillator detector j1 counting and the high-purity germanium detector j3 counting:
in the formula: epsilon γ : the detection efficiency,%, of a high-purity germanium detector j3;
n γ : the counting rate of a high-purity germanium detector j3, CPM;
n γ0 : the high-purity germanium detector j3 background counting rate, CPM;
c |γ : gamma nuclide activity concentration in the standard solution, bq/L;
V 3 : the third liquid mass flow meter b2 measures the volume, L.
In the formula: epsilon β : detection efficiency of the plastic scintillator detector j1,%;
n s : the counting rate, CPM, of the plastic scintillator detector j 1;
n s0 : the plastic scintillator detector j1 background counting rate, CPM;
ρ: response factors of a plastic scintillator detector j1 and a high-purity germanium detector j3 are percent;
c β : beta nuclide activity concentration in the standard solution, bq/L.
Performing a response efficiency comparison test on the plastic scintillator detector j1 and the high-purity germanium detector j3 by using a gamma standard substance, wherein the response factor is calculated by the formula (3):
in the formula: n is β : the plastic scintillator detector j1 measures the count rate, CPM, of gamma nuclides.
By the first liquid mass detector and the second liquid mass detector, the system concentration ratio can be calculated by equation (4):
in the formula:
the concentration ratio of the system;
V 1 : first liquid mass flowmeter c31 volume, L;
V 2 : a second liquid mass flowmeter c32 volume, L.
Through the system concentration ratio, the plastic scintillator detector j1 and the high-purity germanium detector j3, the total beta activity concentration in water and the total gamma activity concentration in water can be respectively calculated by a formula (5) and a formula (6).
In the formula: a. The β : total beta activity concentration in water, bq/L.
In the formula: a. The γ : total gamma activity concentration in water, bq/L.
Calculating the total beta and gamma nuclide measurement detection limits in water through formula (7) and formula (8), respectively:
in the formula: MDC β : the total beta measurement detection limit in water, bq/L;
t 0 : background measurement time.
In the formula: MDC γ : the detection limit, bq/L, is measured for total gamma in water.
In conclusion, the system for monitoring total beta and total gamma in water on line carries out concentration on ions in water through the concentration unit, the concentrated solution is respectively measured by the plastic scintillator and the high-purity germanium detector, the activity concentrations of total beta nuclide and total gamma nuclide in water are obtained through calculation, the concentration rate of the concentration unit is not lower than 40 times, the detection limit of total beta in water is as low as 1Bq/L, and the detection limit of gamma nuclide in water is as low as 0.1Bq/L; the monitoring system has reasonable structural design and high detection accuracy, can realize unattended operation, is stable and reliable by the cooperation control of system programs, and is suitable for monitoring total beta and gamma nuclides in water.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (16)
1. An online monitoring system for total beta and total gamma in water is characterized in that: the monitoring system comprises a sample pipeline, a sampling unit, a concentration unit, a measurement unit and a standard solution supply unit, wherein the sampling unit is sequentially arranged on the sample pipeline, the concentration unit is used for carrying out ion concentration on a water sample obtained by the sampling unit, the measurement unit is used for measuring activity concentrations of total beta and total gamma in concentrated solution, and the standard solution supply unit is used for providing standard solution to calculate the detection efficiency of the measurement unit after the measurement unit detects the concentration; the measuring unit comprises a container for containing the concentrated solution, a first detection mechanism for detecting the total beta gamma activity concentration in the concentrated solution, a second detection mechanism for detecting the total gamma activity concentration in the concentrated solution and a data acquisition unit.
2. The system for on-line monitoring total beta and total gamma in water as claimed in claim 1, wherein: the first detection mechanism comprises a plastic scintillator detector which can be in direct contact with concentrated liquid and detect total beta gamma rays in the concentrated liquid, a first photomultiplier which amplifies a detection signal of the plastic scintillator detector and converts the detection signal into an electric signal, a high-purity germanium detector which is arranged close to the utensil and detects the total gamma rays in the concentrated liquid in the high-purity germanium detector, and a second photomultiplier which amplifies the detection signal of the high-purity germanium detector and converts the detection signal into the electric signal.
3. The online monitoring system for total beta and total gamma in water as claimed in claim 2, wherein: the sampling unit is including locating water pump, filter, first liquid mass flowmeter, second liquid mass flowmeter on the sample pipeline, water pump, filter, first liquid mass flowmeter set gradually, just second liquid mass flowmeter is located between concentration unit and the measuring element.
4. The system for on-line monitoring total beta and total gamma in water as claimed in claim 3, wherein: the standard solution supply unit comprises a reagent bottle for containing standard solution, a supply pipe for communicating the reagent bottle with the sample pipeline, and a third liquid mass flow meter arranged on the supply pipe, wherein the connection position of the supply pipe and the sample pipeline is positioned between the concentration unit and the first liquid mass flow meter.
5. The system for on-line monitoring total beta and total gamma in water as claimed in claim 4, wherein: the high-purity germanium detector is used for measuring gamma rays in the concentrated liquid, the signals are amplified by the second photomultiplier and collected into the data collector, and the activity concentration of the gamma nuclide in the water is calculated by the following formula:
in the formula: a. The γ : the total gamma activity concentration in water, bq/L;
n γ : high purity germanium detector count rate, CPM;
n γ0 : the background counting rate, CPM, of the high-purity germanium detector;
ε γ : detection efficiency of a high-purity germanium detector,%;
6. The system for on-line monitoring total beta and total gamma in water as claimed in claim 5, wherein: the detection efficiency of the high-purity germanium detector is calculated by the following formula:
in the formula: epsilon γ : detection efficiency of a high-purity germanium detector,%;
n γ : high purity germanium detector count rate, CPM;
n γ0 : the background counting rate, CPM, of the high-purity germanium detector;
c |γ : gamma nuclide activity concentration in the standard solution, bq/L;
V 3 : the measurement volume of the third liquid mass flowmeter, L.
7. The system for on-line monitoring total beta and total gamma in water as claimed in claim 5, wherein: the plastic scintillator detector measures total beta gamma rays in the concentrated liquid, the signals are amplified by the first photomultiplier and collected into the data collector, and the activity concentration of the total beta in the water is calculated by the following formula:
in the formula: a. The β : total beta Activity concentration in Water, bq/L
n s : plastic scintillator detector count rate, CPM;
n s0 : background count rate, CPM, of a plastic scintillator detector;
ρ: response factors of the plastic scintillator detector and the high-purity germanium detector are percent;
n γ : high purity germanium detector count rate, CPM;
n γ0 : the background counting rate, CPM, of the high-purity germanium detector;
ε β : plastic scintillator detector detection efficiency,%;
8. The system for on-line monitoring total beta and total gamma in water as claimed in claim 7, wherein: the detection efficiency of the plastic scintillator detector is calculated by the following formula:
in the formula: epsilon β : plastic scintillator detector detection efficiency,%;
n s : plastic scintillator detector count rate, CPM;
n s0 : background count rate, CPM, of a plastic scintillator detector;
ρ: j3 response factors of the plastic scintillator detector and the high-purity germanium detector,%;
c β : beta nuclide activity concentration in the standard solution, bq/L.
9. The system for on-line monitoring total beta and total gamma in water according to claim 8, wherein: the response factor is calculated by the following formula:
in the formula: n is β : the plastic scintillator detector measures the counting rate, CPM, of gamma nuclides;
n s0 : background count rate, CPM, of a plastic scintillator detector;
n γ : high purity germanium detector count rate, CPM;
n γ0 : background count rate, CPM, of high purity germanium detectors.
10. The on-line monitoring system for total beta and total gamma in water as claimed in claim 5 or 7, wherein: the system concentration ratio is calculated by the following formula:
in the formula:
the system concentration ratio;
V 1 : a first liquid mass flow meter volume, L;
V 2 : volume of the second liquid mass flowmeter, L.
11. The system for on-line monitoring total beta and total gamma in water as claimed in claim 5, wherein: the measurement detection limit of total beta nuclide in water is calculated by the following formula:
in the formula: MDC β : the total beta measurement detection limit in water, bq/L;
t 0 : background measurement time.
12. The system for on-line monitoring total beta and total gamma in water as claimed in claim 5, wherein: the measurement detection limit of total gamma nuclides in water is calculated by the following formula:
in the formula: MDC γ : the detection limit, bq/L, is measured for total gamma in water.
13. The on-line monitoring system for total beta and total gamma in water as claimed in any one of claims 1-12, wherein: the household utensils and the plastic scintillator detector are arranged in an integrated structure, and the plastic scintillator detector forms the outer wall of the household utensils.
14. The system for on-line monitoring total beta and total gamma in water as claimed in claim 3, wherein: the concentration mechanism comprises a permeable membrane component, a first pressure sensor, a second pressure sensor and a pressure increasing valve, wherein the first pressure sensor and the second pressure sensor are arranged on the upstream and the downstream of the permeable membrane component, and the pressure increasing valve is arranged on the upstream of the first pressure sensor.
15. The system for on-line monitoring total beta and total gamma in water according to claim 14, wherein: the permeable membrane component comprises two permeable membranes which are arranged in parallel, and the inlets and the outlets of the two permeable membranes are communicated with the sample pipeline through a plane three-way valve.
16. The system for on-line monitoring total beta and total gamma in water according to claim 15, wherein: when the online monitoring system is adopted to monitor a water sample on line, the liquid volume measured by the first liquid mass flowmeter is compared with the liquid volume measured by the second liquid mass flowmeter, the concentration ratio of the water sample in the system is obtained through calculation, and after the concentration ratio is lower than a set value, one of the permeable membranes is switched to the other permeable membrane and monitoring is continued.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922115.0A CN115436985A (en) | 2020-06-23 | 2020-06-23 | Total beta and total gamma on-line monitoring system in water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210922115.0A CN115436985A (en) | 2020-06-23 | 2020-06-23 | Total beta and total gamma on-line monitoring system in water |
| CN202010577578.9A CN111856543B (en) | 2020-06-23 | 2020-06-23 | On-line monitoring device for total beta and total gamma in water and calculation method for activity concentration of total beta and total gamma in water |
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| CN202010577578.9A Division CN111856543B (en) | 2020-06-23 | 2020-06-23 | On-line monitoring device for total beta and total gamma in water and calculation method for activity concentration of total beta and total gamma in water |
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