Tritium on-line monitoring system

Abstract

The utility model belongs to the technical field of tritium monitoring, and discloses an on-line tritium monitoring system, which is characterized in that an opaque container of the on-line tritium monitoring system is arranged in a transparent container, and the transparent container is arranged in a shielding darkroom; the opaque container and an external channel arranged outside the shielding dark chamber form a circulation loop, and a measured fluid flows in the external channel; and a scintillator is contained in the transparent container. The first monitoring assembly comprises a flickering optical fiber bundle arranged in the opaque container and a first photoelectric converter arranged outside the shielding dark room, and the flickering optical fiber bundle is connected with the first photoelectric converter through a transmission optical fiber. The second monitoring assembly comprises a second photoelectric converter, and the second photoelectric converter is arranged in the shielding darkroom and located outside the transparent container. The tritium on-line monitoring system is simple in structure, small in number of parts, low in monitoring cost and capable of monitoring the tritium activity of the measured fluid on line and effectively improving the monitoring accuracy of the tritium activity.

Description

Technical Field

[0001] The utility model relates to the technical field of tritium monitoring, in particular to an on-line tritium monitoring system. Background Art

[0002] Tritium is a radioactive nuclide that emits beta rays. Beta rays have low energy, short ranges, and are easily shielded. During the operation of nuclear power plants, a large amount of tritium-containing wastewater and tritium-containing waste gas are generated. For the steam generators of pressurized water reactor units, there are tritium-containing wastewater and tritium-containing waste gas in both heat exchange channels of the steam generator, but the tritium activities in the two heat exchange channels are quite different. Even if there is no leakage in both heat exchange channels, there is still a small part of tritium that can flow from one heat exchange channel with higher water pressure to the other heat exchange channel with higher water pressure; if there is leakage, tritium will directly flow from one heat exchange channel with higher water pressure to the other heat exchange channel with higher water pressure. Therefore, it is necessary to monitor the tritium activity to determine the tritium leakage amount.

[0003] A monitoring system in the prior art for on-line monitoring of tritium activity mainly consists of a metal shielding housing, a photomultiplier tube, a scintillating fiber detector, a pulse discriminator, a signal amplifier, etc. Although it can achieve on-line monitoring of tritium activity, this monitoring system has a complex structure, and there is still a phenomenon that gamma rays enter the metal shielding housing to interfere with the monitoring results, resulting in low monitoring accuracy. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an on-line tritium monitoring system to solve the above problems existing in the monitoring system in the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The on-line tritium monitoring system includes:

[0007] A shielding darkroom, an opaque container, and a transparent container. The opaque container is arranged inside the transparent container, and the transparent container is arranged inside the shielding darkroom; the opaque container forms a circulation loop with an external channel arranged outside the shielding darkroom, and a fluid to be measured flows in the external channel; a scintillator is placed inside the transparent container;

[0008] A first monitoring component, which includes a scintillating fiber bundle arranged inside the opaque container and a first photoelectric converter arranged outside the shielding darkroom. The scintillating fiber bundle is connected to the first photoelectric converter through a transmission fiber;

[0009] A second monitoring component, which includes a second photoelectric converter arranged inside the shielding darkroom and outside the transparent container.

[0010] As a preferred embodiment of the above tritium online monitoring system, the tritium online monitoring system further includes a computer. Both the first photoelectric converter and the second photoelectric converter are electrically connected to the computer, and the computer can determine the tritium activity based on the monitoring results of the first photoelectric converter and the second photoelectric converter.

[0011] As a preferred embodiment of the above tritium online monitoring system, the number of the first photoelectric converters is two, and both ends of the scintillating fiber bundle are respectively connected to the two first photoelectric converters through transmission fibers in a one-to-one correspondence.

[0012] As a preferred embodiment of the above tritium online monitoring system, the first monitoring component further includes two optical fiber combiners, and the two optical fiber combiners are arranged in a one-to-one correspondence with the two transmission fibers;

[0013] The scintillating fiber bundle includes a plurality of scintillating fibers. One ends of the plurality of scintillating fibers are connected to a corresponding transmission fiber through one of the optical fiber combiners, and the other ends of the plurality of scintillating fibers are connected to the corresponding other transmission fiber through the other optical fiber combiner.

[0014] As a preferred embodiment of the above tritium online monitoring system, the two optical fiber combiners are spaced apart along the height direction of the opaque container.

[0015] As a preferred embodiment of the above tritium online monitoring system, the inlet of the opaque container and the outlet of the opaque container are spaced apart along the height direction of the opaque container, and the inlet of the opaque container is located above the outlet of the opaque container.

[0016] As a preferred embodiment of the above tritium online monitoring system, the tritium online monitoring system further includes a circulation pump, and the circulation pump, the opaque container and the external channel form the circulation loop.

[0017] As a preferred embodiment of the above tritium online monitoring system, the number of the second photoelectric converters is two, and the two second photoelectric converters are symmetrically distributed on both sides of the transparent container.

[0018] As a preferred embodiment of the above tritium online monitoring system, the tritium online monitoring system further includes a condensation component. The inlet of the condensation component is communicated with the detection outlet of the external channel, and the outlet of the condensation component is communicated with the inlet of the opaque container.

[0019] As a preferred embodiment of the above tritium online monitoring system, the shielding darkroom is a lead shielding darkroom.

[0020] Advantages of the present utility model:

[0021] The present utility model provides a tritium on-line monitoring system, which includes a shielding darkroom, an opaque container, a transparent container, a first monitoring component and a second monitoring component. Among them, the opaque container is arranged inside the transparent container, and the transparent container is arranged inside the shielding darkroom; the opaque container forms a circulation loop with an external channel arranged outside the shielding darkroom, and a fluid to be measured flows in the external channel; a scintillator is placed inside the transparent container. The first monitoring component includes a scintillating fiber bundle arranged inside the opaque container and a first photoelectric converter arranged outside the shielding darkroom, and the scintillating fiber bundle is connected to the first photoelectric converter through a transmission fiber. The second monitoring component includes a second photoelectric converter, and the second photoelectric converter is arranged inside the shielding darkroom and outside the transparent container.

[0022] The tritium on-line monitoring system is provided with a circulation loop formed by the transparent container and the external channel, so that new fluid to be measured can continuously flow into the opaque container without generating monitoring waste, and then the tritium activity is determined in real time according to the monitoring results of the first photoelectric converter and the second photoelectric converter, so as to realize on-line monitoring of the tritium activity of the fluid to be measured. Specifically, after the fluid to be measured flows into the opaque container, the β-ray energy emitted by tritium in the fluid to be measured can de-excite the scintillator molecules of the scintillating fiber bundle to emit visible light photons, and the visible light photons are transmitted to the first photoelectric converter through the scintillating fiber bundle and the transmission fiber. After the first photoelectric converter monitors the visible light photons, it converts the optical signal into an electrical signal and outputs the first monitoring result; at the same time, the scintillator in the transparent container monitors cosmic rays such as γ-rays entering the shielding darkroom. If the scintillator in the transparent container emits visible light photons, the second photoelectric converter directly converts the optical signal of the monitored visible light photons into an electrical signal and outputs the second monitoring result; then the tritium activity is determined according to the first monitoring result and the second monitoring result, so that compared with the prior art, the monitoring accuracy of the tritium activity can be effectively avoided from being affected by cosmic rays such as γ-rays.

[0023] Secondly, the number of photoelectric converters in the tritium on-line monitoring system is small, which can effectively simplify the structure of the tritium on-line monitoring system and reduce the monitoring cost.

[0024] Therefore, the tritium on-line monitoring system has a simple structure, few components, low monitoring cost, can on-line monitor the tritium activity of the fluid to be measured, and can effectively improve the monitoring accuracy of the tritium activity. Description of the Drawings

[0025] Figure 1 is the schematic diagram of the tritium on-line monitoring system provided by the specific embodiment of the present utility model;

[0026] Figure 2 is the partial schematic diagram of the tritium on-line monitoring system provided by the specific embodiment of the present utility model.

[0027] In the figure:

[0028] 1. Shielded darkroom;

[0029] 2. Opaque container;

[0030] 3. Transparent container;

[0031] 41. Scintillating optical fiber; 42. First photoelectric converter; 43. Transmission optical fiber; 44. Optical fiber combiner;

[0032] 5. Second photoelectric converter;

[0033] 6. Computer;

[0034] 7. Circulation pump;

[0035] 8. Condensation component; 81. Heat exchanger; 811. Heat exchange channel; 812. Cooling channel; 82. Chiller; 83. Switch valve. Detailed implementation manner

[0036] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0037] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As Figure 1 shown, the present utility model provides a tritium on-line monitoring system, which includes a shielding darkroom 1, an opaque container 2, a transparent container 3, a first monitoring component and a second monitoring component. Among them, the opaque container 2 is arranged inside the transparent container 3, and the transparent container 3 is arranged inside the shielding darkroom 1; the opaque container 2 forms a circulation loop with an external channel arranged outside the shielding darkroom 1, and the fluid to be measured flows in the external channel; a scintillator is contained in the transparent container 3. The first monitoring component includes a scintillating fiber bundle arranged inside the opaque container 2 and a first photoelectric converter 42 arranged outside the shielding darkroom 1. The scintillating fiber bundle is connected to the first photoelectric converter 42 through a transmission fiber 43. The second monitoring component includes a second photoelectric converter 5, and the second photoelectric converter 5 is arranged inside the shielding darkroom 1 and outside the transparent container 3.

[0041] The tritium on-line monitoring system is arranged such that the transparent container 3 forms a circulation loop with the external channel, enabling new fluid to be measured to continuously flow into the opaque container 2 without generating monitoring waste. Then, the tritium activity is determined in real time based on the monitoring results of the first photoelectric converter 42 and the second photoelectric converter 5, so as to realize on-line monitoring of the tritium activity of the fluid to be measured. Specifically, after the fluid to be measured flows into the opaque container 2, the β-ray energy emitted by tritium in the fluid to be measured can de-excite the scintillator molecules of the scintillating fiber bundle to emit visible light photons. The visible light photons are transmitted through the scintillating fiber bundle and the transmission fiber 43 to the first photoelectric converter 42. After the first photoelectric converter 42 monitors the visible light photons, it converts the optical signal into an electrical signal and outputs the first monitoring result; at the same time, the scintillator in the transparent container 3 monitors cosmic rays such as γ-rays entering the shielding darkroom 1. If the scintillator in the transparent container 3 emits visible light photons, the second photoelectric converter 5 directly converts the optical signal of the monitored visible light photons into an electrical signal and outputs the second monitoring result; then the tritium activity is determined based on the first monitoring result and the second monitoring result, so that compared with the prior art, the influence of cosmic rays such as γ-rays on the monitoring accuracy of tritium activity can be effectively avoided.

[0042] Secondly, the number of photoelectric converters in the tritium on-line monitoring system is small, which can effectively simplify the structure of the tritium on-line monitoring system and reduce the monitoring cost.

[0043] Thus, the tritium on-line monitoring system has a simple structure, few components, low monitoring cost, can on-line monitor the tritium activity of the fluid to be measured, and can effectively improve the monitoring accuracy of tritium activity.

[0044] It can be understood that the purpose of using the opaque container 2 is to form a darkroom environment inside it to avoid the influence of external light and / or environmental rays on the monitoring results of the first photoelectric converter 42. An opaque cladding is provided on the outer periphery of the transmission optical fiber 43 to ensure that the first photoelectric converter 42 can effectively receive the optical signal. The purpose of using the transparent container 3 is to enable the second photoelectric converter 5 to effectively receive the optical signal.

[0045] It can be understood that the tritium on-line monitoring system can monitor at long distances or short distances, has good versatility, and good working stability.

[0046] Among them, as Figure 1 shown, the tritium on-line monitoring system further includes a computer 6. Both the first photoelectric converter 42 and the second photoelectric converter 5 are electrically connected to the computer 6. The computer 6 can determine the tritium activity based on the monitoring results of the first photoelectric converter 42 and the second photoelectric converter 5.

[0047] Specifically, when the first photoelectric converter 42 sends an electrical signal to the computer 6 and the second photoelectric converter 5 does not send an electrical signal to the computer 6, it indicates that there is no interference from cosmic rays such as γ rays on the monitoring accuracy. The computer 6 accumulates the number of times the first photoelectric converter 42 sends an electrical signal to the computer 6 this time, which is used as the basis for determining the tritium activity.

[0048] When the first photoelectric converter 42 and the second photoelectric converter 5 send electrical signals to the computer 6 at the same time, it indicates that there is interference from cosmic rays such as γ rays on the monitoring accuracy. At this time, the computer 6 does not accumulate the number of times the first photoelectric converter 42 sends an electrical signal to the computer 6 this time, so as to effectively avoid the influence of cosmic rays such as γ rays on the monitoring accuracy of tritium activity.

[0049] Then, the tritium activity is determined based on the total number of times accumulated within the unit time. The tritium activity is the number of tritium decays per second.

[0050] Preferably, as Figure 1 shown, the number of the first photoelectric converters 42 is two. Both ends of the scintillating optical fiber bundle are respectively connected to the two first photoelectric converters 42 through the transmission optical fiber 43 in one-to-one correspondence. Specifically, when both of the two first photoelectric converters 42 send electrical signals to the computer 6 and the second photoelectric converter 5 does not send an electrical signal to the computer 6, the computer 6 accumulates the number of times the first photoelectric converter 42 sends an electrical signal to the computer 6 this time, which can further improve the accuracy of the optical signal monitored by the first photoelectric converter 42.

[0051] Further preferably, as Figure 1 shown, the number of the second photoelectric converters 5 is two, and the two second photoelectric converters 5 are symmetrically distributed on both sides of the transparent container 3. Specifically, when both of the two first photoelectric converters 42 send electrical signals to the computer 6 and neither of the two second photoelectric converters 5 sends an electrical signal to the computer 6, the computer 6 accumulates the number of times the first photoelectric converter 42 sends an electrical signal to the computer 6 this time. It can further improve the accuracy of the optical signal monitored by the first photoelectric converter 42.

[0052] Among them, as Figure 1 shown, the first monitoring component further includes two optical fiber combiners 44, and the two optical fiber combiners 44 are arranged in one-to-one correspondence with the two transmission optical fibers 43; the scintillating optical fiber bundle includes a plurality of scintillating optical fibers 41, and one ends of the plurality of scintillating optical fibers 41 are connected to a corresponding one of the transmission optical fibers 43 through one of the optical fiber combiners 44, and the other ends of the plurality of scintillating optical fibers 41 are connected to the corresponding other transmission optical fiber 43 through the other optical fiber combiner 44. To realize connecting the two ends of the plurality of scintillating optical fibers 41 to the two first photoelectric converters 42 in one-to-one correspondence. It can improve the monitoring efficiency.

[0053] Since the energy of the β-ray is low and its range in the fluid to be measured is short, only the tritium decay occurring in the extremely thin fluid layer near the surface of the scintillating optical fiber 41 can be monitored. Therefore, in order to improve the monitoring efficiency, it is preferred that no cladding is provided on the outer peripheral wall of the scintillating optical fiber 41.

[0054] Specifically, the scintillating optical fiber 41 is a fluorine-doped optical fiber with polystyrene as the matrix. In other embodiments, the scintillating optical fiber 41 can also be other types of fluorine-doped optical fibers, etc.

[0055] Specifically, the diameter range of the scintillating optical fiber 41 is: 0.5 mm to 1 mm. It is preferred that the diameter of the scintillating optical fiber 41 is less than 1 mm. So as to facilitate the scintillating optical fiber 41 to maximize the monitoring area exposed in the opaque container 2.

[0056] Preferably, the two optical fiber combiners 44 are spaced apart along the height direction of the opaque container 2. With such a setting, the length of the scintillating optical fiber 41 is maximized, thereby further improving the monitoring efficiency.

[0057] Preferably, the inlet of the opaque container 2 and the outlet of the opaque container 2 are spaced apart along the height direction of the opaque container 2, and the inlet of the opaque container 2 is located above the outlet of the opaque container 2. With such a setting, the fluid to be measured entering the opaque container 2 can flow out of the opaque container 2 under its own gravity, which can reduce the energy consumption; and the flow direction of the liquid is roughly consistent with the length of the scintillating optical fiber 41, which can further improve the monitoring efficiency and monitoring accuracy.

[0058] Preferably, asFigure 1 and Figure 2 As shown in Figure 2 , the tritium on-line monitoring system further includes a circulation pump 7. The circulation pump 7, the opaque container 2 and the external channel form a circulation loop, which can improve the flow performance of the fluid to be measured to ensure the monitoring accuracy.

[0059] Further preferably, the circulation pump 7 is a constant flow circulation pump, which can make the fluid to be measured flow through the opaque container 2 at a constant flow rate, thereby further improving the monitoring accuracy.

[0060] Specifically, as shown in Figure 1 Figure 1 , it is preferred that the circulation pump 7 is distributed outside the shielding darkroom 1. As an alternative, the circulation pump 7 can also be arranged inside the shielding darkroom 1 and distributed outside the transparent container 3.

[0061] Specifically, in this embodiment, as shown in Figure 1 Figure 1 , the circulation pump 7 is exemplarily arranged upstream of the opaque container 2.

[0062] Specifically, when the fluid to be measured is a liquid, the fluid to be measured is directly pumped into the opaque container 2 through the circulation pump 7 for on-line monitoring.

[0063] Specifically, as shown in Figure 2 Figure 2 , when the fluid to be measured is a gas, the tritium on-line monitoring system further includes a condensation component 8. The inlet of the condensation component 8 is communicated with the detection outlet of the external channel, and the outlet of the condensation component 8 is communicated with the inlet of the opaque container 2. Specifically, the outlet of the condensation component 8 is communicated with the inlet of the circulation pump 7. After the gas is condensed into a liquid by the condensation component 8, it is then pumped into the opaque container 2 through the circulation pump 7 for on-line monitoring.

[0064] It can be understood that the fluid to be measured entering the opaque container 2 is a liquid, which can be used to monitor the tritium activity of nuclear steam, the tritium activity of environmental water, and the tritium activity of liquid fluids in nuclear power plants, etc. In this embodiment, the fluid to be measured is exemplarily the liquid water in a nuclear power plant.

[0065] Exemplarily, as shown in Figure 2 Figure 2 , the condensation component 8 includes a heat exchanger 81. The heat exchange channel 811 of the heat exchanger 81 forms a condensation loop with the chiller 82. The inlet of the cooling channel 812 of the heat exchanger 81 is communicated with the detection outlet of the external channel, and the outlet of the cooling channel 812 is communicated with the inlet of the circulation pump 7 to enable the gas to be condensed into a liquid. The heat exchange channel 811 is exemplarily arranged as a heat exchange coil. Optionally, a switching valve 83 and other structures can also be arranged on the pipeline where the detection outlet of the external channel is communicated with the inlet of the cooling channel 812 according to actual working conditions. It can be understood that other types of condensation components 8 can also be used to condense the gas.

[0066] Specifically, as shown inFigure 2 As shown, preferably, the condensation assembly 8 is distributed outside the shielded darkroom 1. As an alternative, the condensation assembly 8 can also be arranged inside the shielded darkroom 1 and distributed outside the transparent container 3.

[0067] Preferably, the shielded darkroom 1 is a lead shielded darkroom. The lead shielded darkroom can block environmental rays such as γ rays to further improve the monitoring accuracy.

[0068] Among them, the opaque container 2 is made of an opaque material such as opaque polytetrafluoroethylene or stainless steel.

[0069] Among them, the transparent container 3 is made of a transparent material such as a transparent plastic material.

[0070] Among them, the first photoelectric converter 42 uses a photomultiplier tube, a silicon photomultiplier tube, or a microchannel plate photomultiplier tube, etc. It is sufficient to be able to convert the optical signal into an electrical signal.

[0071] Among them, the scintillator contained in the transparent container 3 is a liquid scintillator or a solid scintillator. Among them, the solid scintillator is preferably a plastic scintillator.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Tritium online monitoring system, characterized in that, Comprising: A shielding darkroom (1), an opaque container (2) and a transparent container (3), wherein the opaque container (2) is arranged inside the transparent container (3), and the transparent container (3) is arranged inside the shielding darkroom (1); the opaque container (2) forms a circulation loop with an external channel arranged outside the shielding darkroom (1), and a fluid to be measured flows in the external channel; a scintillator is contained in the transparent container (3). A first monitoring component, the first monitoring component includes a scintillating fiber bundle arranged inside the opaque container (2), and a first photoelectric converter (42) arranged outside the shielding darkroom (1), and the scintillating fiber bundle is connected to the first photoelectric converter (42) through a transmission fiber (43). A second monitoring component, the second monitoring component includes a second photoelectric converter (5), and the second photoelectric converter (5) is arranged inside the shielding darkroom (1) and outside the transparent container (3).

2. The tritium on-line monitoring system according to claim 1, wherein The tritium online monitoring system further includes a computer (6), the first photoelectric converter (42) and the second photoelectric converter (5) are both electrically connected to the computer (6), and the computer (6) can determine the tritium activity according to the monitoring results of the first photoelectric converter (42) and the second photoelectric converter (5).

3. The tritium on-line monitoring system according to claim 1, wherein The number of the first photoelectric converters (42) is two, and both ends of the scintillating fiber bundle are respectively connected to the two first photoelectric converters (42) through the transmission fibers (43) in a one-to-one correspondence.

4. The tritium on-line monitoring system according to claim 3, characterized in that, The first monitoring component further includes two optical fiber combiners (44), and the two optical fiber combiners (44) are arranged in a one-to-one correspondence with the two transmission fibers (43). The scintillating fiber bundle includes a plurality of scintillating fibers (41), one ends of the plurality of scintillating fibers (41) are connected to a corresponding transmission fiber (43) through one of the optical fiber combiners (44), and the other ends of the plurality of scintillating fibers (41) are connected to the corresponding other transmission fiber (43) through the other optical fiber combiner (44).

5. The tritium on-line monitoring system according to claim 4, characterized in that The two optical fiber combiners (44) are spaced apart along the height direction of the opaque container (2).

6. The tritium on-line monitoring system according to any one of claims 1-5, characterized in that, The inlet of the opaque container (2) and the outlet of the opaque container (2) are spaced apart along the height direction of the opaque container (2), and the inlet of the opaque container (2) is located above the outlet of the opaque container (2).

7. The tritium on-line monitoring system according to any one of claims 1-5, characterized in that, The tritium online monitoring system further includes a circulation pump (7), and the circulation pump (7), the opaque container (2) and the external channel form the circulation loop.

8. The tritium on-line monitoring system according to any one of claims 1-5, characterized in that, The number of the second photoelectric converters (5) is two, and the two second photoelectric converters (5) are symmetrically distributed on both sides of the transparent container (3).

9. The tritium on-line monitoring system according to any one of claims 1-5, characterized in that, The tritium online monitoring system further includes a condensation component (8), the inlet of the condensation component (8) is communicated with the detection outlet of the external channel, and the outlet of the condensation component (8) is communicated with the inlet of the opaque container (2).

10. The tritium on-line monitoring system according to any one of claims 1-5, characterized in that, The shielding darkroom (1) is a lead shielding darkroom.

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