A marine radiation environment online monitoring gamma spectrometer calibration device and method

Abstract

The application relates to a marine radiation environment online monitoring gamma spectrometer calibration device and method, and belongs to the technical field of gamma spectrometer efficiency calibration. The device comprises a spherical valve tank, a proportioning tank, a main water tank, a positioning mechanism, a gamma spectrometer to be calibrated and a control system. A clear water inlet pipe is arranged on the spherical valve tank. The spherical valve tank is connected with the proportioning tank through a proportioning pipe. A sealing cover is arranged on the top of the proportioning tank. The bottom of the proportioning tank is connected with the main water tank through a proportioning drain pipe. A pressurizing pipe and a flushing pipe are further arranged on the proportioning tank. The main water tank is provided with the positioning mechanism. The positioning mechanism is provided with the gamma spectrometer to be calibrated. The application realizes automatic proportioning of the radioactive solution, automatic uniformity, automatic liquid level regulation and control and automatic three-dimensional positioning, reduces errors caused by human operation, and makes the calibration result more accurate.

Description

Technical Field

[0001] This invention relates to the field of gamma spectrometer efficiency calibration technology, and in particular to a gamma spectrometer calibration device and method for online monitoring of marine radiation environment. Background Technology

[0002] Online gamma spectrometers for marine radiation environment monitoring are commonly used for real-time early warning and monitoring of the marine radiation environment. These spectrometers are typically deployed directly in seawater via towed vessels or marine buoys.

[0003] Accurate quantitative analysis of marine radiation environment online monitoring gamma spectrometers relies on efficiency calibration. However, unlike traditional onshore spectrometers, gamma spectrometers are directly immersed in seawater, while onshore gamma spectrometers place the sample in their lead chamber. Therefore, the calibration methods of the two are completely opposite processes.

[0004] The online monitoring of marine radiation environment gamma spectrometer requires a large-volume liquid source simulating the marine environment, consideration of the spectrometer's effective detection range for different nuclides in seawater, consideration of the spectrometer's positioning within the environment, and consideration of the accuracy of the radioactive solution activity ratio.

[0005] Currently, there is no corresponding calibration device for the measurement technology of gamma spectrometers used for online monitoring of marine radiation environment. The difficulty lies in the difficulty of obtaining large-volume liquid sources, and the severe adsorption effect of the target nuclide Cs-137 in marine monitoring, which results in the lack of a dedicated calibration device. At present, passive efficiency calibration is often used, but the parameters that need to be considered in the model are quite complex, and its accuracy has not been verified in practice, which seriously restricts the progress of online monitoring technology for marine radiation environment. Summary of the Invention

[0006] To address or partially address the problems existing in related technologies, this invention provides a calibration device and method for an online gamma spectrometer for monitoring marine radiation environment. A measurement transmission device for an online gamma spectrometer for monitoring marine radiation environment has been developed, which can simulate the marine radiation environment, and also features radioactive solution mixing, three-dimensional positioning, and automated operation. Based on this, an innovative efficiency calibration method is proposed, solving the problem of the inability of online gamma spectrometers for monitoring marine radiation environment to transmit measurements.

[0007] The above-mentioned online monitoring device for marine radiation environment gamma spectrometer calibration includes a spherical valve tank, a mixing tank, a main water tank, a positioning mechanism, a gamma spectrometer to be calibrated, and a control system; The spherical valve tank is equipped with a clean water inlet pipe, and the spherical valve tank is connected to the proportioning tank through a proportioning pipe, which is equipped with a plunger pump and a flow meter. The top of the mixing tank is equipped with a sealing cover, and the bottom of the mixing tank is connected to the main water tank through a mixing drain pipe. The mixing drain pipe is equipped with a mixing drain valve. The main water tank is equipped with a first liquid level sensor for detecting the internal liquid level. The mixing tank is also equipped with a pressurizing pipe and a flushing pipe. The pressurizing pipe is equipped with a pressurizing valve, and the flushing pipe is equipped with a flushing valve. The main water tank is equipped with a positioning mechanism, and the positioning mechanism is equipped with a gamma spectrometer to be calibrated. The positioning mechanism is used to drive the gamma spectrometer to be calibrated to a set position inside the main water tank. The control system is electrically connected to the plunger pump, flow meter, proportioning and draining valve, first liquid level sensor, pressurizing valve, and flushing valve, respectively.

[0008] In some embodiments, the positioning mechanism includes an X-axis linear guide slide, a Y-axis linear guide slide, and a Z-axis linear guide slide. The top of the main water tank is equipped with two parallel X-axis linear guide slides. The two ends of the Y-axis linear guide slide are respectively fixedly installed on the sliders of the two X-axis linear guide slides. The slider of the Y-axis linear guide slide is equipped with a Z-axis linear guide slide. The slider of the Z-axis linear guide slide is provided with a loading hole plate; The gamma spectrometer to be calibrated is placed on the sample plate.

[0009] In some embodiments, the slider of the Z-axis linear guide slide is provided with a fixing ring arm located above the loading plate. The fixing ring arm is used to hold the gamma spectrometer to be calibrated, thereby fixing the position of the gamma spectrometer to be calibrated.

[0010] In some solutions, a transfer tank is also included, which is equipped with a second liquid level sensor for the liquid level height inside the detector, and the second liquid level sensor is electrically connected to the control system. The transfer tank is connected to the main water tank via a transfer outlet pipe, and a transfer outlet pump is installed on the transfer outlet pipe; The transfer tank is connected to the bottom of the main water tank via a transfer water inlet pipe, and a transfer water inlet pump is installed on the transfer water inlet pipe.

[0011] In some designs, the inner wall of the main water tank is coated with Teflon.

[0012] In some designs, the main water tank is equipped with a circulation pump, which is electrically connected to the control system.

[0013] This application also provides a method for calibrating a gamma spectrometer using the aforementioned online marine radiation environment monitoring gamma spectrometer calibration device, specifically including the following steps: S1: Add volume V2 of the standard radioactive solution to the mixing vessel, wherein... , In the formula, m1 is the target radioactivity concentration of the radioactive solution in the main water tank; V1 is the volume of the solution in the main water tank; m2 is the activity concentration of the standard radioactive solution; V2 is the required volume of the standard radioactive solution; S2: Inject a certain amount of clean water into the mixing tank to prepare the first batch of radioactive seawater; S3: Pour the prepared radioactive seawater mixture into the main water tank, then clean the mixing tank n times, and also pour the cleaning water into the main water tank; after cleaning, inject clean water into the main water tank until the internal liquid level reaches the set value. S4: Move the gamma spectrometer to be calibrated to the sampling point using the positioning mechanism; S5: The gamma spectrometer to be calibrated is put into operation, thereby obtaining the energy spectrum of the gamma spectrometer. Then, based on the energy spectrum of the gamma spectrometer to be calibrated, its detection efficiency ε is calculated. in, ; In the formula, ε is the detection efficiency of the target nuclide; N is the net peak area count rate of the target nuclide; A represents the activity of a standard large-volume solution; λ is the attenuation coefficient of the target nuclide; t is the measurement time; pγ is the branching ratio of the target nuclide energy; S6: Fit the relevant data according to the following formula, and the fitted curve is the efficiency calibration curve of the γ-ray spectrometer to be calibrated. ; In the formula, ε is the detection efficiency of the target nuclide; bi is the fitting coefficient; E represents the energy of the target nuclide; n is the degree of the polynomial, which is 4.

[0014] In some schemes, in step S4, after the positioning mechanism moves the gamma spectrometer to be calibrated to the sampling point, it performs Z-axis correction based on the crystal height of the gamma spectrometer, and the correction height is Zcorrect; wherein, , In the formula, Zcorrect is the Z-axis correction height; Zset is the height setting along the Z-axis; Hcrystal is the crystal height of the gamma spectrometer to be calibrated.

[0015] The technical solution provided by this invention may include the following beneficial effects: 1. This device fills the gap in the problem of "inaccurate measurement and inability to transmit measurements" of gamma spectrometers for online monitoring of marine radiation environment; 2. This device integrates automated functions, such as automatic proportioning, automatic homogenization, automatic liquid level control, and automatic three-dimensional positioning, which reduces errors introduced by human operation and makes the calibration results more accurate. 3. Traditional seawater sampling requires the addition of strong acid to avoid radionuclide adsorption. This device is designed with 316 stainless steel and Teflon coating, which solves the problem of strong acid environment for large-volume liquid sources and further reduces calibration risks.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of the scale device shown in an embodiment of the present invention; Figure 2 This is a schematic diagram of the scale device shown in an embodiment of the present invention; Figure 3 This is another structural schematic diagram of the scale device shown in an embodiment of the present invention; Figure 4 This is a schematic diagram showing the connection between the spherical valve tank and the proportioning tank of the scale device in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the connection between the main water tank and the proportioning tank of the calibration device in an embodiment of the present invention; Figure 6 This is a schematic diagram of the positioning mechanism of the scale device shown in an embodiment of the present invention; Figure 7 This is a control block diagram of the positioning mechanism of the scale device shown in an embodiment of the present invention.

[0019] Figure label: 1. Spherical valve tank; 101. Clean water inlet pipe; 102. Proportioning pipe; 103. Plunger pump; 104. Flow meter; 2. Proportioning tank; 201. Sealing cover; 202. Proportioning drain pipe; 203. Proportioning drain valve; 204. Pressurizing pipe; 205. Flushing pipe; 206. Pressurizing valve; 207. Flushing valve; 3. Main water tank; 301. First liquid level sensor; 4. Positioning mechanism; 401. X-axis linear guide slide; 402. Y-axis linear guide slide; 403. Z-axis linear guide slide; 404. Orifice plate; 405. Fixed ring arm; 5. Gamma spectrometer to be calibrated; 6. Control system; 7. Transfer tank; 701. Second liquid level sensor; 702. Transfer outlet pipe; 703. Transfer outlet pump; 704. Transfer inlet pipe; 705. Transfer inlet pump. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0021] Example 1: like Figures 1-7 As shown, this application provides a calibration device for an online monitoring gamma spectrometer of marine radiation environment, including a spherical valve tank 1, a mixing tank 2, a main water tank 3, a positioning mechanism 4, a gamma spectrometer to be calibrated 5, and a control system 6.

[0022] The spherical valve tank 1 is a tank with an internal water level float. Its function is to store clean water, and it can automatically stop water intake when the internal liquid level reaches the set level.

[0023] The spherical valve tank 1 is equipped with a clean water inlet pipe 101, which is a tap water pipe, and there is always water flowing inside it. The spherical valve tank 1 is connected to the proportioning tank 2 through a proportioning pipe 102. The proportioning pipe 102 is equipped with a plunger pump 103 and a flow meter 104. When the plunger pump 103 is working, it can pump the clean water in the spherical valve tank 1 into the proportioning tank 2, and the amount of clean water injected into the proportioning tank 2 can be detected by the flow meter 104.

[0024] The top of the mixing tank 2 has a hole, and a sealing cap 201 is threaded into the hole to achieve the opening and closing of the mixing tank 2. The bottom of the mixing tank 2 is connected to the main water tank 3 through a mixing drain pipe 202. The mixing drain pipe 202 is equipped with a mixing drain valve 203. The main water tank 3 is equipped with a first liquid level sensor 301 for detecting the internal liquid level. The mixing tank 2 is also equipped with a pressurizing pipe 204 and a flushing pipe 205. The pressurizing pipe 204 is equipped with a pressurizing valve 206, and the flushing pipe 205 is equipped with a flushing valve 207. The flushing valve 207 is connected to a tap water pipe. Thus, when the flushing valve 207 is opened, external tap water can flow into the mixing tank 2 to flush the mixing tank 2. The pressurization pipe 204 is connected to an external pressurization pump. When the pressurization valve 206 is opened, the external pressurization pump pressurizes the mixing tank 2. After pressurization, the mixing drain valve 203 is opened, and the solution in the mixing tank 2 is forced into the main water tank 3.

[0025] The main water tank 3 is equipped with a positioning mechanism 4, and the positioning mechanism 4 is equipped with a gamma spectrometer 5 to be calibrated. The positioning mechanism 4 is used to drive the gamma spectrometer 5 to be calibrated to a set position in the main water tank 3. The control system 6 is electrically connected to the plunger pump 103, the flow meter 104, the proportioning and draining valve 203, the first liquid level sensor 301, the pressure valve 206, and the flushing valve 207.

[0026] The application process: 1. Fix the gamma spectrometer 5 to be calibrated onto the positioning mechanism 4; set relevant parameters in the control system 6, such as the sampling point coordinates of the gamma spectrometer 5 to be calibrated, the liquid volume of the mixing tank 2, the number of times the mixing tank 2 is rinsed, the water volume of the main water tank 3, and the size parameters of the mixing tank 2 and the main water tank 3. 2. Open the sealing cap 201, and then, according to the relevant parameters, add the set volume of standard radioactive solution into the mixing tank 2. Then tighten the sealing cap 201 to seal the mixing tank 2. 3. The control system 6 controls the plunger pump 103 to start, pumping the clean water in the ball valve tank 1 into the proportioning tank 2. During this process, the flow meter 104 detects the amount of clean water pumped into the proportioning tank 2 and transmits it to the control system 6. When the pumped amount reaches the set amount of water, the control system 6 controls the plunger pump 103 to stop. 4. The control system 6 controls the pressurization valve 206, thereby pressurizing the mixing tank 2 through the external pressurization pump. After a certain period of time, the control system 6 controls the mixing drain valve 203 to open, thereby pressurizing the solution in the mixing tank 2 into the main water tank 3. 5. The flushing valve 207 is activated to release the air pressure in the proportioning tank 2 to reduce its internal air pressure. Then the control system 6 controls the flushing valve 207 to activate, and clean water is injected into the proportioning tank 2 through the flushing pipe 205 to clean the proportioning tank 2. After a period of time, the proportioning tank 2 is almost full. Step 4 is repeated to pressurize the clean water used to clean the proportioning tank 2 into the main water tank 3. 6. According to the settings, the control system 6 automatically controls this device to repeat step 5 to rinse the mixing tank 2 multiple times. 7. Inject clean water into the main water tank 3 (a three-way pipe 2021 is provided on the mixing drain pipe 202, and the branch pipe of the three-way pipe 2021 is connected to the external clean water pipeline and a valve is provided. The valve is connected to the control system 6. When this step is performed, the valve is opened and the external clean water is injected into the main water tank 3 through the three-way pipe 2021 and the mixing drain pipe 202). The first liquid level sensor 301 detects the liquid level in the main water tank 3 and transmits the relevant data to the control system 6. After the liquid level in the main water tank 3 reaches the set liquid level, stop injecting water into the main water tank 3. In this way, the solution of the required concentration can be prepared in the main water tank 3.

[0027] 8. The positioning mechanism 4 moves the γ-ray spectrometer 5 to be calibrated to the set position, and obtains the energy spectrum of the γ-ray spectrometer 5. After relevant calculations, the efficiency calibration curve of the γ-ray spectrometer 5 can be obtained. The efficiency calibration curve is then imported into the γ-ray spectrometer 5 to complete the calibration of the γ-ray spectrometer 5.

[0028] In some schemes, such as Figure 6 As shown, the positioning mechanism 4 includes an X-axis linear guide slide 401, a Y-axis linear guide slide 402, and a Z-axis linear guide slide 403. The top of the main water tank 3 is equipped with two parallel X-axis linear guide slides 401, and the height of the two X-axis linear guide slides 401 is higher than the edge of the main water tank 3 to facilitate the installation and removal of the calibrated gamma spectrometer.

[0029] The two ends of the Y-axis linear guide slide 402 are respectively fixedly installed on the sliders of the two X-axis linear guide slides 401; the slider of the Y-axis linear guide slide 402 is provided with a Z-axis linear guide slide 403; the slider of the Z-axis linear guide slide 403 is provided with a loading plate 404; the gamma spectrometer 5 to be calibrated is placed on the loading plate 404.

[0030] During operation, the X-axis linear guide slide 401 moves the gamma spectrometer 5 to be calibrated along the X-axis, the Y-axis linear guide slide 402 moves the gamma spectrometer 5 along the Y-axis, and the Z-axis linear guide slide 403 moves the gamma spectrometer 5 along the Z-axis. This allows the gamma spectrometer 5 to be moved to any position within the main water tank 3, enabling the device to perform other functions besides calibrating the gamma spectrometer 5. The perforated plate 404 ensures that the gamma spectrometer 5 can fully contact the liquid in the main water tank 3.

[0031] In this embodiment, the slider of the Z-axis linear guide slide 403 is provided with a fixing ring arm 405 located above the loading plate 404. The fixing ring arm 405 includes two semi-circular rings, one end of which is hinged to each other and the other end is connected by bolts. In use, the fixing ring arm 405 holds the gamma spectrometer 5 to be calibrated, thereby fixing the position of the gamma spectrometer 5 to be calibrated and effectively ensuring that the gamma spectrometer 5 to be calibrated will not shift during movement.

[0032] In some schemes, a transfer tank 7 is also included, which is equipped with a second liquid level sensor 701 for detecting the internal liquid level height of the detector. The second liquid level sensor 701 is electrically connected to the control system 6.

[0033] The transfer tank 7 is connected to the main water tank 3 via a transfer outlet pipe 702, and a transfer outlet pump 703 is provided on the transfer outlet pipe 702; the transfer tank 7 is connected to the bottom of the main water tank 3 via a transfer inlet pipe 704, and a transfer inlet pump 705 is provided on the transfer inlet pipe 704.

[0034] When it is necessary to reduce the concentration of radioactive material in the liquid in the main water tank 3, the transfer pump 705 is turned on, thereby pumping part of the liquid in the main water tank 3 into the transfer tank 7, and then a certain amount of clean water is introduced into the main water tank 3. In this way, the concentration of radioactive material in the main water tank 3 can be diluted. At the same time, the transfer tank 7 serves as a temporary storage for the radioactive solution, so as to facilitate the subsequent treatment of the radioactive solution.

[0035] When it is necessary to increase the concentration of radioactive material in the liquid in the main water tank 3, the transfer pump 703 is turned on, which can pump the solution in the transfer tank 7 back into the main water tank 3 to increase the concentration of radioactive material in the main water tank 3.

[0036] In some designs, the main water tank 3 is made of 316 stainless steel and has a Teflon coating on its inner wall, which effectively avoids the technical problem of Cs-137 adsorbing onto the inner wall of the main water tank 3.

[0037] In some designs, the main water tank 3 is equipped with a circulation pump (not shown in the figure). The circulation pump is electrically connected to the control system 6. The circulation pump is an independent water pump placed independently in the main water tank 3 to inject clean water into the main water tank 3. The control system 6 controls the circulation pump to work. The circulation pump draws in the liquid in the main water tank 3 and then pumps it out, thereby achieving the purpose of stirring the solution in the main water tank 3 and effectively improving the mixing uniformity of the solution in the main water tank 3.

[0038] Example 2: Based on the calibration device for an online monitoring gamma spectrometer of marine radiation environment described in Embodiment 1, this application also provides a method for calibrating a gamma spectrometer using the above-mentioned device, specifically including the following steps: S1: Add the standard radioactive solution of volume V2 into the mixing container 2, wherein, , In the formula, m1 is the target radioactivity concentration of the radioactive solution in the main water tank 3; V1 is the volume of the solution in the main water tank 3; m2 is the activity concentration of the standard radioactive solution; V2 is the required volume of the standard radioactive solution; S2: Inject a certain amount of clean water into mixing tank 2 to carry out the first preparation of radioactive seawater; S3: The prepared radioactive seawater mixture is introduced into the main water tank 3, and then the mixing tank 2 is cleaned n times, with the cleaning water also introduced into the main water tank 3; after cleaning, clean water is injected into the main water tank 3 until the internal liquid level reaches the set value. S4: The gamma spectrometer 5 to be calibrated is moved to the sampling point using the positioning mechanism 4; then, Z-axis correction is performed based on the crystal height of the gamma spectrometer 5, with the correction height being Zcorrect; where... , In the formula, Zcorrect is the Z-axis correction height; Zset is the height setting along the Z-axis; Hcrystal is the crystal height of the γ-ray spectrometer to be calibrated. S5: The gamma spectrometer 5 to be calibrated is put into operation, thereby obtaining the energy spectrum of the gamma spectrometer 5 to be calibrated. Then, based on the energy spectrum of the gamma spectrometer 5 to be calibrated, its detection efficiency ε is calculated. in, ; In the formula, ε is the detection efficiency of the target nuclide; N is the net peak area count rate of the target nuclide; A represents the activity of a standard large-volume solution; λ is the attenuation coefficient of the target nuclide; t is the measurement time; pγ is the branching ratio of the target nuclide energy; S6: Fit the relevant data according to the following formula. The fitted curve is the efficiency calibration curve of the γ-ray spectrometer 5 to be calibrated. Import the fitted curve into the γ-ray spectrometer 5 to complete the efficiency calibration of the γ-ray spectrometer 5.

[0039] ; In the formula, ε is the detection efficiency of the target nuclide; bi is the fitting coefficient; E represents the energy of the target nuclide; n is the degree of the polynomial, which is 4.

[0040] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A calibration device for an online monitoring gamma spectrometer of marine radiation environment, characterized in that: Includes a spherical valve tank (1), a proportioning tank (2), a main water tank (3), a positioning mechanism (4), a gamma spectrometer to be calibrated (5), and a control system (6); The spherical valve tank (1) is provided with a clean water inlet pipe (101). The spherical valve tank (1) is connected to the proportioning tank (2) through a proportioning pipe (102). The proportioning pipe (102) is provided with a plunger pump (103) and a flow meter (104). The top of the mixing tank (2) is provided with a sealing cap (201), and the bottom of the mixing tank (2) is connected to the main water tank (3) through a mixing drain pipe (202). A mixing drain valve (203) is provided on the mixing drain pipe (202), and a first liquid level sensor (301) for detecting the internal liquid level height is provided in the main water tank (3). The mixing tank (2) is also provided with a pressurizing pipe (204) and a flushing pipe (205). A pressurizing valve (206) is provided on the pressurizing pipe (204), and a flushing valve (207) is provided on the flushing pipe (205). The main water tank (3) is provided with a positioning mechanism (4), and the positioning mechanism (4) is provided with a gamma spectrometer (5) to be calibrated. The positioning mechanism (4) is used to drive the gamma spectrometer (5) to be calibrated to a set position inside the main water tank (3). The control system (6) is electrically connected to the plunger pump (103), flow meter (104), proportioning drain valve (203), first liquid level sensor (301), pressurizing valve (206), and flushing valve (207), respectively.

2. The calibration device for an online marine radiation environment gamma spectrometer according to claim 1, characterized in that: The positioning mechanism (4) includes an X-axis linear guide slide (401), a Y-axis linear guide slide (402), and a Z-axis linear guide slide (403). The top of the main water tank (3) is provided with two parallel X-axis linear guide slides (401). The two ends of the Y-axis linear guide slide (402) are respectively fixedly installed on the sliders of the two X-axis linear guide slides (401); The slider of the Y-axis linear guide slide (402) is provided with a Z-axis linear guide slide (403). The slider of the Z-axis linear guide slide (403) is provided with a loading plate (404). The gamma spectrometer (5) to be calibrated is placed on the sample plate (404).

3. The calibration device for an online marine radiation environment monitoring gamma spectrometer according to claim 2, characterized in that: The slider of the Z-axis linear guide slide (403) is provided with a fixed ring arm (405) located above the loading plate (404). The fixed ring arm (405) is used to hold the gamma spectrometer (5) to be calibrated, thereby fixing the position of the gamma spectrometer (5).

4. The calibration device for an online marine radiation environment monitoring gamma spectrometer according to claim 1, characterized in that: It also includes a transfer tank (7), which is equipped with a second liquid level sensor (701) for the liquid level height inside the detector, and the second liquid level sensor (701) is electrically connected to the control system (6); The transfer tank (7) is connected to the main water tank (3) through the transfer outlet pipe (702), and the transfer outlet pipe (702) is equipped with a transfer outlet pump (703). The transfer tank (7) is connected to the bottom of the main water tank (3) through a transfer water inlet pipe (704), and a transfer water inlet pump (705) is provided on the transfer water inlet pipe (704).

5. The calibration device for an online marine radiation environment monitoring gamma spectrometer according to claim 1, characterized in that: The inner wall of the main water tank (3) is coated with Teflon.

6. The calibration device for an online marine radiation environment monitoring gamma spectrometer according to claim 1, characterized in that: The main water tank (3) is equipped with a circulation pump, which is electrically connected to the control system (6).

7. The calibration method for a calibration device for an online marine radiation environment monitoring gamma spectrometer according to any one of claims 1-6, characterized in that, Specifically, the following steps are included: S1: Add the standard radioactive solution of volume V2 into the mixing container (2), wherein, ， In the formula, m1 is the target radioactivity concentration of the radioactive solution in the main water tank (3); V1 is the volume of the solution in the main water tank (3); m2 is the activity concentration of the standard radioactive solution; V2 is the required volume of the standard radioactive solution; S2: Inject a certain amount of clean water into the mixing tank (2) to carry out the first preparation of radioactive seawater; S3: The prepared radioactive seawater is introduced into the main water tank (3), and then the mixing tank (2) is cleaned n times. The cleaning water is also introduced into the main water tank. After cleaning, clean water is injected into the main water tank (3) until the internal liquid level reaches the set value. S4: Move the γ-spectrum instrument (5) to be calibrated to the sampling point using the positioning mechanism (4); S5: The gamma spectrometer (5) to be calibrated is put into operation, thereby obtaining the energy spectrum of the gamma spectrometer (5). Then, based on the energy spectrum of the gamma spectrometer (5), its detection efficiency ε is calculated. in, ; In the formula, ε is the detection efficiency of the target nuclide; N is the net peak area count rate of the target nuclide; A represents the activity of a standard large-volume solution; λ is the attenuation coefficient of the target nuclide; t is the measurement time; p γ The branching ratio of the target nuclide's energy; S6: Fit the relevant data according to the following formula, and the fitted curve is the efficiency calibration curve of the γ-spectrum (5) to be calibrated; ； In the formula, ε is the detection efficiency of the target nuclide; b i These are the fitting coefficients; E represents the energy of the target nuclide; n is the degree of the polynomial, which is 4.

8. The calibration method according to claim 7, characterized in that: In step S4, after the positioning mechanism moves the γ-ray spectrometer (5) to the sampling point, it performs Z-axis correction based on the crystal height of the γ-ray spectrometer (5), and the correction height is... Z correct ; in, ， In the formula, Z correct It is the Z-axis corrected height; Z set It sets the height along the Z-axis; H crystal It is the crystal height of the γ-ray spectrometer (5) to be calibrated.

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