Method for detecting activity concentration of tritium gas

Abstract

The embodiment of the present application provides a detection method for the activity concentration of tritium gas, which comprises the following steps: controlling the first sub-channel to be in communication with the first gas inlet channel, controlling the to-be-detected gas to enter the first sub-channel from the first gas inlet channel, detecting the activity concentration of tritium gas in the to-be-detected gas by using the first detection device, judging whether the activity concentration of tritium gas in the to-be-detected gas is less than a first threshold value, wherein the first threshold value is the minimum value of the first activity concentration, and determining the on-off state of the second sub-channel and the first gas inlet channel according to the judgment result. The detection method of the embodiment of the present application can select the corresponding sub-channel and the corresponding detector for detection according to the size of the activity concentration of tritium gas, so that the tritium gas with the activity concentration greater than the first threshold value can be prevented from entering the second sub-channel and the second detection device, that is, the tritium gas with the activity concentration greater than the first threshold value can be prevented from causing pollution to the second detection device and the second sub-channel, and thus the detection accuracy of the tritium monitor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection, in particular to a tritium activity concentration detection method. BACKGROUND

[0002] Tritium is widely present in the effluent of nuclear power plants. Since tritium is radioactive and gaseous tritium is easy to diffuse, the influence of tritium in the environment on human health is increasingly valued, and it is of great significance to monitor the tritium activity in the air.

[0003] In the related art, different detectors have different detection ranges for tritium activity concentration. In order to realize the detection of environmental level and working condition level (10 2 Bq / m 3 ~ 10 10 Bq / m 3 ) tritium, multiple detectors need to be integrated. However, tritium is easily adsorbed on the surface of materials or penetrated into materials. Therefore, high-activity tritium can contaminate the detectors and pipelines used for detecting low-activity tritium, thereby greatly interfering with the detection results of the detectors. SUMMARY

[0004] Therefore, the embodiments of the present application aim to provide a tritium activity concentration detection method which can improve detection accuracy.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application provide a tritium activity concentration detection method, which is used for a tritium monitor. The tritium monitor comprises a first gas inlet channel, a control module, and a first sub-channel and a second sub-channel which are both in communication with the first gas inlet channel. The first sub-channel comprises a first detection device, and the to-be-detected gas can enter the first sub-channel through the first gas inlet channel. The first detection device is used for detecting the tritium activity concentration in the to-be-detected gas in the first sub-channel. The second sub-channel comprises a second detection device, and the to-be-detected gas can enter the second sub-channel through the first gas inlet channel. The second detection device is used for detecting the tritium activity concentration in the to-be-detected gas in the second sub-channel. The control module can control the on-off between the first sub-channel and the second sub-channel and the first gas inlet channel, and is in communication connection with the first detection device and the second detection device. The detection range of the first detection device is a first activity concentration, the detection range of the second detection device is a second activity concentration, the first activity concentration is greater than the second activity concentration, and the detection method comprises the following steps.

[0006] Controlling the first sub-channel to be in communication with the first gas inlet channel;

[0007] Controlling the to-be-detected gas to enter the first sub-channel from the first gas inlet channel;

[0008] detecting the tritium activity concentration in the to-be-tested gas by the first detecting device;

[0009] determining whether the tritium activity concentration in the to-be-tested gas is less than a first threshold value, wherein the first threshold value is a minimum value of a first activity concentration;

[0010] determining, according to the determination result, a connection state of the second sub-channel and the first gas inlet channel.

[0011] In some embodiments, the determining, according to the determination result, of the connection state of the second sub-channel and the first gas inlet channel comprises:

[0012] if the tritium activity concentration in the to-be-tested gas is greater than or equal to the first threshold value, controlling the first gas inlet channel to be in communication with the first sub-channel and to be disconnected from the second sub-channel;

[0013] if the tritium activity concentration in the to-be-tested gas is less than the first threshold value, controlling the first gas inlet channel to be disconnected from the first sub-channel and to be in communication with the second sub-channel.

[0014] In some embodiments, if the tritium activity concentration in the to-be-tested gas is less than the first threshold value, the step of controlling the first gas inlet channel to be disconnected from the first sub-channel and to be in communication with the second sub-channel is followed by:

[0015] detecting the tritium activity concentration in the to-be-tested gas by the second detecting device.

[0016] In some embodiments, the tritium monitor comprises a third sub-channel in communication with the first gas inlet channel, the third sub-channel comprises a third detecting device, the to-be-tested gas can enter the third sub-channel through the first gas inlet channel, the third detecting device is configured to detect the tritium activity concentration in the to-be-tested gas in the third sub-channel, the control module is configured to control the connection state between the third sub-channel and the first gas inlet channel, and the third detecting device is in communication connection with the control module; wherein the detection range of the third detecting device is a third activity concentration, the third activity concentration is less than the second activity concentration, and the detection method comprises:

[0017] determining whether the tritium activity concentration in the to-be-tested gas is less than a second threshold value, wherein the second threshold value is a minimum value of a second activity concentration;

[0018] determining, according to the determination result, a connection state of the third sub-channel and the first gas inlet channel.

[0019] In some embodiments, the determining, according to the determination result, of the connection state of the third sub-channel and the first gas inlet channel comprises:

[0020] If the tritium activity concentration in the to-be-tested gas is greater than or equal to the second threshold value, the first gas inlet channel is controlled to be in communication with the second sub-channel and to be disconnected from the first sub-channel and the third sub-channel.

[0021] If the tritium activity concentration in the to-be-tested gas is less than the second threshold value, the first gas inlet channel is controlled to be disconnected from the first sub-channel and the second sub-channel and to be in communication with the third sub-channel.

[0022] In some embodiments, if the tritium activity concentration in the to-be-tested gas is less than the second threshold value, the first gas inlet channel is controlled to be disconnected from the second sub-channel and to be in communication with the third sub-channel, and the detection method comprises:

[0023] detecting the tritium activity concentration in the to-be-tested gas by the third detection device.

[0024] In some embodiments, the tritium monitor comprises a second gas inlet channel in communication with the third sub-channel, and detecting the tritium activity concentration in the to-be-tested gas by the third detection device comprises:

[0025] controlling working gas to enter the third sub-channel from the second gas inlet channel;

[0026] controlling the working gas to enter the third detection device after being mixed with the to-be-tested gas at a certain ratio, wherein the third detection device is a second proportional counter.

[0027] In some embodiments, the tritium monitor comprises a second gas inlet channel in communication with the second sub-channel, and detecting the tritium activity concentration in the to-be-tested gas by the second detection device comprises:

[0028] controlling working gas to enter the second sub-channel from the second gas inlet channel;

[0029] controlling the working gas to enter the second detection device after being mixed with the to-be-tested gas at a certain ratio, wherein the second detection device is a first proportional counter.

[0030] In some embodiments, the first activity concentration ranges from 10 7 Bq / m 3 to 10 10 Bq / m 3 .

[0031] In some embodiments, the second activity concentration ranges from 10 4 Bq / m 3 to 10 7 Bq / m 3 .

[0032] In some embodiments, the third activity concentration ranges from 10 2 Bq / m 3 ~ 10 4 Bq / m 3 .

[0033] In some embodiments, the tritium monitor comprises a filter, a dryer and a gas pump arranged on the first gas inlet channel, and before the step of controlling the first sub-channel to be in communication with the first gas inlet channel, the method comprises:

[0034] The gas pump is controlled to make the to-be-tested gas flow through the filter, the dryer and the gas pump in sequence.

[0035] In some embodiments, the second gas inlet channel comprises a compensated proportional counter tube for measuring the environmental background count rate of the control work.

[0036] The tritium monitoring method provided by the embodiments of the present application is applied to a tritium monitor, which comprises a first gas inlet channel, a first sub-channel, a second sub-channel and a control module. The first sub-channel is in communication with the first gas inlet channel. The first sub-channel comprises a first detection device. The to-be-tested gas can enter the first sub-channel through the first gas inlet channel. The first detection device is used to detect the tritium activity concentration in the to-be-tested gas in the first sub-channel. The second sub-channel is in communication with the first gas inlet channel. The second sub-channel comprises a second detection device. The to-be-tested gas can enter the second sub-channel through the first gas inlet channel. The second detection device is used to detect the tritium activity concentration in the to-be-tested gas in the second sub-channel. By arranging the first sub-channel and the second sub-channel which are both in communication with the first gas inlet channel, and arranging the first detection device and the second detection device with different detection ranges on the first sub-channel and the second sub-channel respectively, the detection range of the tritium monitor for the tritium activity concentration can be improved. In addition, the control module can control the on-off between the first sub-channel and the second sub-channel and the first gas inlet channel, and is in communication connection with the first detection device and the second detection device. The detection range of the first detection device is a first activity concentration. The detection range of the second detection device is a second activity concentration. The first activity concentration is greater than the second activity concentration.

[0037] The detection method of the tritium activity concentration comprises the following steps: controlling the first sub-channel to be in communication with the first gas inlet channel, controlling the to-be-detected gas to enter the first sub-channel from the first gas inlet channel, detecting the tritium activity concentration in the to-be-detected gas by the first detection device, judging whether the tritium activity concentration in the to-be-detected gas is less than the first threshold value, wherein the first threshold value is the minimum value of the first activity concentration, and determining the on-off state of the second sub-channel and the first gas inlet channel according to the judgment result. That is, the tritium activity concentration in the to-be-detected gas can be detected by the first detection device first, it is judged whether the tritium activity concentration in the to-be-detected gas is less than the first threshold value, the on-off state of the second sub-channel and the first gas inlet channel is determined according to the judgment result, and thus the corresponding sub-channel and the corresponding detector can be selected for detection according to the size of the tritium activity concentration, the tritium with an activity concentration greater than the first threshold value can be prevented from entering the second sub-channel and the second detection device, that is, the tritium with an activity concentration greater than the first threshold value can be prevented from polluting the second detection device and the second sub-channel, and thus the detection accuracy of the tritium monitor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A structure schematic diagram of a tritium monitor provided by an embodiment of the present application;

[0039] Figure 2 A flowchart of a detection method of a tritium activity concentration provided by an embodiment of the present application.

[0040] REFERENCE SIGNS

[0041] 1, first gas inlet channel; 11, filter; 12, dryer; 13, gas pump; 2, second gas inlet channel; 21, compensation proportional counter; 22, fourth flow controller; 23, fourth electromagnetic valve; 24, fifth electromagnetic valve; 3, first sub-channel; 31, first detection device; 32, first electromagnetic valve; 33, first flow controller; 4, second sub-channel; 41, second detection device; 42, second electromagnetic valve; 43, second flow controller; 5, third sub-channel; 51, third detection device; 52, third electromagnetic valve; 53, third flow controller. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments and technical features in the present application can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present application, and should not be regarded as an improper limitation on the present application.

[0043] In the description of the present application, the orientation terms are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation on the present application.

[0044] The first embodiment of the present application provides a tritium activity concentration detection method, please refer to Figure 1 and Figure 2 for a tritium monitor, the tritium monitor includes a first gas inlet channel 1, a control module, and a first sub-channel 3 and a second sub-channel 4 which are both in communication with the first gas inlet channel 1, the first sub-channel 3 includes a first detection device 31, the gas to be measured can enter the first sub-channel 3 through the first gas inlet channel 1, the first detection device 31 is used to detect the tritium activity concentration in the gas to be measured in the first sub-channel 3; the second sub-channel 4 includes a second detection device 41, the gas to be measured can enter the second sub-channel 4 through the first gas inlet channel 1, the second detection device 41 is used to detect the tritium activity concentration in the gas to be measured in the second sub-channel 4; the control module can control the on-off between the first sub-channel 3 and the second sub-channel 4 and the first gas inlet channel 1, and is in communication connection with the first detection device 31 and the second detection device 41; wherein the detection range of the first detection device 31 is the first activity concentration, the detection range of the second detection device 41 is the second activity concentration, the first activity concentration is greater than the second activity concentration, and the detection method includes:

[0045] S100, control the first sub-channel to communicate with the first gas inlet channel.

[0046] It should be noted that the gas to be measured can include the monitoring of the environmental level tritium gas and the working condition level tritium gas (10 2 Bq / m 3 ~ 10 10 Bq / m 3 ).

[0047] The first sub-channel 3 is in communication with the first gas inlet channel 1, the first sub-channel 3 includes the first detection device 31, the gas to be measured can enter the first sub-channel 3 through the first gas inlet channel 1, the first detection device 31 is used to detect the tritium activity concentration in the gas to be measured in the first sub-channel 3, the detection range of the first detection device 31 is the first activity concentration, that is, the first sub-channel 3 and the first detection device 31 can be used to detect the gas to be measured with the activity concentration of the first activity concentration.

[0048] In addition, the control module is capable of controlling the on-off between the first sub-channel 3 and the second sub-channel 4 and the first gas inlet channel 1, and is in communication connection with the first detection device 31 and the second detection device 41, wherein the detection range of the first detection device 31 is the first activity concentration, the detection range of the second detection device 41 is the second activity concentration, and the first activity concentration is greater than the second activity concentration. In this way, the first gas inlet channel 1 can be controlled to be in communication with the first sub-channel 3 and be disconnected with the second sub-channel 4, that is, the first sub-channel 3 and the first detection device 31 are used to detect the to-be-detected gas first, so that the tritium gas with an activity concentration greater than the first threshold value can be prevented from entering the second sub-channel 4 and the second detection device 41, that is, the tritium gas with an activity concentration greater than the first threshold value can be prevented from polluting the second detection device 41 and the second sub-channel 4, and thus the detection accuracy of the tritium monitor is improved.

[0049] The control module includes a programmable controller and a touch screen. The programmable controller is connected with the first electromagnetic valve 32, the second electromagnetic valve 42, the third electromagnetic valve 52, the first flow controller 33, the second flow controller 43, the third flow controller 53, the gas pump 13, the proportional counter electronics, the ionization chamber electronics, and the touch screen through communication lines. The programmable controller is programmed to control the on-off of the first electromagnetic valve 32, the second electromagnetic valve 42, the third electromagnetic valve 52, and the gas pump 13 of the gas delivery device; control the opening degree of the first flow controller 33, the second flow controller 43, and the third flow controller 53; realize communication connection with the proportional counter electronics and the ionization chamber electronics to process the measurement data; realize communication connection with the touch screen; and control the tritium monitor.

[0050] The touch screen realizes the interaction between the user and the programmable controller, stores and displays the processed measurement results.

[0051] S200, control the to-be-detected gas to enter the first sub-channel from the first gas inlet channel.

[0052] The specific way of controlling the to-be-detected gas to enter the first sub-channel 3 from the first gas inlet channel 1 is not limited here. In an example, the tritium monitor includes a proportional valve, and the first gas inlet channel 1 is in communication with the first sub-channel 3 and the second sub-channel 4 through the proportional valve. That is, the proportional valve can be set, and the proportional valve can be controlled to selectively connect the first sub-channel 3 or the second sub-channel 4 to the first gas inlet channel 1.

[0053] In other embodiments, an electromagnetic valve can be arranged on the first sub-channel 3 or the second sub-channel 4, and the electromagnetic valve on the corresponding sub-channel can be controlled by the control module to selectively connect the first sub-channel 3 or the second sub-channel 4 to the first gas inlet channel 1.

[0054] Exemplarily, refer to Figure 1 The tritium monitor comprises a first electromagnetic valve 32 in communication connection with the control module, and the first electromagnetic valve 32 is arranged on the first sub-channel 3.

[0055] Exemplarily, refer to Figure 1 The tritium monitor comprises a second electromagnetic valve 42 in communication connection with the control module, and the second electromagnetic valve 42 is arranged on the second sub-channel 4.

[0056] S300, detecting the tritium activity concentration in the to-be-detected gas by the first detection device.

[0057] It should be noted that for the working level tritium, an ionization chamber is usually used as a detector, and for the environmental level tritium, a proportional counter is usually used as a detector.

[0058] In an embodiment, the first detection device 31 is an ionization chamber. That is, the to-be-detected gas with a tritium activity concentration range of 10 7 Bq / m 3 ~ 10 10 Bq / m 3 is detected by the ionization chamber.

[0059] S400, judging whether the tritium activity concentration in the to-be-detected gas is less than a first threshold value, wherein the first threshold value is the minimum value of the first activity concentration.

[0060] In an embodiment, the tritium monitor comprises ionization chamber electronics, which is in communication connection with the ionization chamber and the control module. The ionization chamber electronics converts the current signal transmitted by the ionization chamber into a current value and sends it to the control module, so that the tritium activity concentration can be obtained and compared with the first activity concentration.

[0061] S500, determining the on-off state of the second sub-channel and the first gas inlet channel according to the judgment result.

[0062] It can be understood that the ionization chamber electronics converts the current signal transmitted by the ionization chamber into a current value and sends it to the control module, so that the control module can obtain the tritium activity concentration and compare it with the first activity concentration, and determine the on-off state of the second sub-channel 4 and the first gas inlet channel 1 according to the judgment result.

[0063] In an embodiment, determining the on-off state of the second sub-channel and the first gas inlet channel according to the judgment result comprises:

[0064] S510, if the tritium activity concentration in the to-be-detected gas is greater than or equal to the first threshold value, controlling the first gas inlet channel to be in communication with the first sub-channel and disconnected with the second sub-channel;

[0065] S520, if the tritium activity concentration in the to-be-tested gas is less than the first threshold value, the first gas inlet channel is controlled to be disconnected with the first sub-channel and connected with the second sub-channel.

[0066] If the tritium activity concentration in the to-be-tested gas is greater than or equal to the first threshold value, the first gas inlet channel 1 is controlled to be connected with the first sub-channel 3 and disconnected with the second sub-channel 4, that is, the to-be-tested gas can enter the first sub-channel 3 and the tritium activity concentration is detected by the first detection device 31; if the tritium activity concentration in the to-be-tested gas is less than the first threshold value, the first gas inlet channel 1 is controlled to be disconnected with the first sub-channel 3 and connected with the second sub-channel 4, that is, the to-be-tested gas can enter the second sub-channel 4 and the tritium activity concentration is detected by the second detection device 41. In this way, the tritium with the activity concentration greater than the first threshold value can be prevented from entering the second sub-channel 4 and the second detection device 41, that is, the tritium with the activity concentration greater than the first threshold value can be prevented from polluting the second detection device 41 and the second sub-channel 4, thereby improving the detection accuracy of the tritium monitor.

[0067] In an embodiment, after the step of controlling the first gas inlet channel to be disconnected with the first sub-channel and connected with the second sub-channel if the tritium activity concentration in the to-be-tested gas is less than the first threshold value, the method further comprises:

[0068] Detecting the tritium activity concentration in the to-be-tested gas by the second detection device.

[0069] In an embodiment, the second detection device 41 is a first proportional counter. That is, the to-be-tested gas with the tritium activity concentration ranging from 10 4 Bq / m 3 to 10 7 Bq / m 3 is detected by the first proportional counter.

[0070] In an embodiment, referring to Figure 1 , the tritium monitor comprises a third sub-channel 5 connected with the first gas inlet channel 1, the third sub-channel 5 comprises a third detection device 51, the to-be-tested gas can enter the third sub-channel 5 through the first gas inlet channel 1, the third detection device 51 is used to detect the tritium activity concentration in the to-be-tested gas in the third sub-channel 5, the control module can control the connection and disconnection between the third sub-channel 5 and the first gas inlet channel 1 and is in communication connection with the third detection device 51; wherein the detection range of the third detection device 51 is a third activity concentration, the third activity concentration is less than the second activity concentration, and the detection method comprises:

[0071] S600, judging whether the tritium activity concentration in the to-be-tested gas is less than a second threshold value, wherein the second threshold value is the minimum value of the second activity concentration.

[0072] In an embodiment, the tritium monitor comprises proportional counter electronics, the proportional counter electronics being in communication with the first proportional counter and the control module. The proportional counter electronics converts the pulse signal output by the first proportional counter into a count rate, and sends the count rate to the control module, whereby the tritium gas activity concentration can be obtained and compared with the second threshold value.

[0073] S700, determining the on-off state of the third sub-channel and the first gas inlet channel according to the determination result.

[0074] It can be understood that the proportional counter electronics converts the pulse signal output by the first proportional counter into a count rate, and sends the count rate to the control module, whereby the control module can obtain the tritium gas activity concentration and compare it with the second activity concentration, and determine the on-off state of the third sub-channel 5 and the first gas inlet channel 1 according to the determination result.

[0075] In an embodiment, determining the on-off state of the third sub-channel and the first gas inlet channel according to the determination result comprises:

[0076] S710, if the tritium gas activity concentration in the gas to be measured is greater than or equal to the second threshold value, controlling the first gas inlet channel to be in communication with the second sub-channel and disconnected from the first sub-channel and the third sub-channel.

[0077] S720, if the tritium gas activity concentration in the gas to be measured is less than the second threshold value, controlling the first gas inlet channel to be disconnected from the first sub-channel and the second sub-channel and connected to the third sub-channel.

[0078] In the related art, different detectors have different detection ranges for tritium gas activity concentration. Currently, mature tritium monitor products are mainly divided into two types. One is a low activity level tritium monitor mainly used in tritium leakage, tritium waste recovery and disposal sites, and the other is a conventional level tritium monitor mainly used in tritium-related sites. The representative product of the low activity level tritium monitor is Model 593.2 (measurement range 1 x 10 3 Bq / m 3 -2 x 10 6 Bq / m 3 ) of the United States Overhoff Company, and the working condition level tritium monitor has TAM-500 type tritium monitor (measurement range 3.2 x 10 4 Bq / m 3 -2 x 10 13 Bq / m 3 ) of the China Institute of Atomic Radiation Protection and 7009 type tritium monitor (measurement range 3.7 x 10 4 Bq / m 3 -3.7 x 10 10 Bq / m 3). To achieve the environmental level and the working level (10 2 Bq / m 3 ~ 10 10 Bq / m 3 The detection of tritium gas needs to integrate the use of multiple detectors.

[0079] In order to improve the detection range, the tritium monitor of the embodiment of the application sets multiple sub-channels and corresponding detectors, for example, in an embodiment, referring to Figure 1 , the tritium monitor includes a third sub-channel 5 in communication with the first gas inlet channel 1, the third sub-channel 5 includes a third detection device 51, the to-be-detected gas can enter the third sub-channel 5 through the first gas inlet channel 1, the third detection device 51 is used for detecting the tritium activity concentration in the to-be-detected gas in the third sub-channel 5, the control module can control the on-off between the third sub-channel 5 and the first gas inlet channel 1, and is in communication connection with the third detection device 51; wherein the detection range of the third detection device 51 is the third activity concentration, and the third activity concentration is less than the second activity concentration.

[0080] The third sub-channel 5 is arranged to communicate with the first air inlet channel 1 and the first detection device 31 and the second detection device 41, and the third detection device 51 is arranged on the third sub-channel 5 and has a detection range different from that of the first detection device 31 and the second detection device 41, so that the detection range of the tritium monitor on the tritium activity concentration can be improved. In addition, the first sub-channel 3 can be controlled to communicate with the first air inlet channel 1 by the control module, the test gas enters the first sub-channel 3 from the first air inlet channel 1, the tritium activity concentration in the test gas is detected by the first detection device 31, and it is judged whether the tritium activity concentration in the test gas is less than the first threshold value. If the tritium activity concentration in the test gas is greater than or equal to the first threshold value, the first air inlet channel 1 is controlled to communicate with the first sub-channel 3 and to be disconnected with the second sub-channel 4 and the third sub-channel 5, that is, the test gas can be controlled to enter the first sub-channel 3 and the tritium activity concentration can be detected by the first detection device 31. If the tritium activity concentration in the test gas is less than the first threshold value, the first air inlet channel 1 is controlled to be disconnected with the first sub-channel 3 and the third sub-channel 5 and to communicate with the second sub-channel 4, that is, the test gas can be controlled to enter the second sub-channel 4 and the tritium activity concentration can be detected by the second detection device 41. If the tritium activity concentration in the test gas is greater than or equal to the second threshold value, the first air inlet channel 1 is controlled to communicate with the second sub-channel 4 and to be disconnected with the third sub-channel 5, that is, the test gas can be controlled to enter the second sub-channel 4 and the tritium activity concentration can be detected by the second detection device 41. If the tritium activity concentration in the test gas is less than the second threshold value, the first air inlet channel 1 is controlled to be disconnected with the first sub-channel 3 and the second sub-channel 4 and to communicate with the third sub-channel 5, that is, the test gas can be controlled to enter the third sub-channel 5 and the tritium activity concentration can be detected by the third detection device 51. In this way, the tritium gas with an activity concentration greater than the first threshold value can be prevented from entering the second sub-channel 4 and the second detection device 41, that is, the tritium gas with an activity concentration greater than the first threshold value can be prevented from polluting the second detection device 41 and the second sub-channel 4, the tritium gas with an activity concentration greater than or equal to the second threshold value can be prevented from entering the third sub-channel 5 and the third detection device 51, that is, the tritium gas with an activity concentration greater than or equal to the second threshold value can be prevented from polluting the third detection device 51 and the third sub-channel 5, and the detection accuracy of the tritium monitor is improved.

[0081] It should be noted that the ranges of the first activity concentration, the second activity concentration and the third activity concentration are not limited herein and can be determined according to different detection devices. For example, in an embodiment, the range of the first activity concentration is 10 7 Bq / m 3 ~ 10 10 Bq / m 3 , the range of the second activity concentration is 10 4 Bq / m 3 ~ 10 7 Bq / m3 , the third activity concentration ranges from 10 2 Bq / m 3 to 10 4 Bq / m 3 . That is, the first sub-channel 3 can be used to detect the tritium gas with an activity concentration ranging from 10 7 Bq / m 3 to 10 10 Bq / m 3 , the second sub-channel 4 can be used to detect the tritium gas with an activity concentration ranging from 10 4 Bq / m 3 to 10 7 Bq / m 3 , and the third sub-channel 5 can be used to detect the tritium gas with an activity concentration ranging from 10 2 Bq / m 3 to 10 4 Bq / m 3 .

[0082] The first threshold is the minimum value of the first activity concentration, i.e., the first threshold is 10 7 Bq / m 3 , and the second threshold is the minimum value of the second activity concentration, i.e., the first threshold is 10 4 Bq / m 3 .

[0083] In an embodiment, if the activity concentration of the tritium gas in the to-be-detected gas is less than the second threshold, the first gas inlet channel 1 is controlled to be disconnected from the second sub-channel 4 and connected to the third sub-channel 5, and the detection method comprises the following steps:

[0084] detecting the activity concentration of the tritium gas in the to-be-detected gas by the third detection device 51.

[0085] In an embodiment, the third detection device 51 is a second proportional counter. That is, the second proportional counter is used to detect the to-be-detected gas with an activity concentration ranging from 10 2 Bq / m 3 to 10 4 Bq / m 3 .

[0086] It should be noted that the specific manner of controlling the first gas inlet channel 1 to be connected to or disconnected from the third sub-channel 5 is not limited herein. For example, in an embodiment, the tritium monitor comprises a proportional valve, and the first gas inlet channel 1 is connected to the third sub-channel 5 through the proportional valve. That is, the proportional valve can be set, and the proportional valve can be controlled to selectively connect the first gas inlet channel 1 to the first sub-channel 3, the second sub-channel 4, or the third sub-channel 5.

[0087] In some embodiments, referring to Figure 1 The third sub-channel 5 can be provided with an electromagnetic valve, and the electromagnetic valve in the corresponding sub-channel can be controlled by the control module to selectively guide the working gas in the first sub-channel 3, the second sub-channel 4 or the third sub-channel 5.

[0088] For example, the tritium monitor includes a third electromagnetic valve 52 in communication with the control module, and the third electromagnetic valve 52 is arranged on the third sub-channel 5.

[0089] In one embodiment, the tritium monitor includes a second gas inlet channel in communication with the third sub-channel, and the tritium activity concentration in the gas to be detected is detected by a third detection device, including:

[0090] The working gas is controlled to enter the third sub-channel from the second gas inlet channel.

[0091] The working gas is controlled to enter the third detection device after being mixed with the gas to be detected at a certain ratio, and the third detection device is a second proportional counter.

[0092] In one embodiment, the tritium monitor includes a second gas inlet channel in communication with the second sub-channel, and the tritium activity concentration in the gas to be detected is detected by a second detection device, including:

[0093] The working gas is controlled to enter the second sub-channel from the second gas inlet channel.

[0094] The working gas is controlled to enter the second detection device after being mixed with the gas to be detected at a certain ratio, and the second detection device is a first proportional counter.

[0095] In one embodiment, the tritium monitor includes a second gas inlet channel 2 in communication with the second sub-channel 4 and the third sub-channel 5, and the working gas can enter the first proportional counter and / or the second proportional counter through the second gas inlet channel 2.

[0096] If the tritium activity concentration in the gas to be measured is less than the first threshold value, the first gas inlet channel 1 is controlled to be disconnected with the first sub-channel 3 and the third sub-channel 5, and connected with the second sub-channel 4, and the second gas inlet channel 2 is controlled to be disconnected with the third sub-channel 5 and connected with the second sub-channel 4, that is, the gas to be measured can be controlled to enter the second sub-channel 4 through the first gas inlet channel 1, and the working gas can also enter the second sub-channel 4 through the second gas inlet channel 2, and then mixed in a certain proportion to enter the first proportional counter, and the tritium activity concentration is detected by the first proportional counter; if the tritium activity concentration in the gas to be measured is less than the second threshold value, the first gas inlet channel 1 is controlled to be disconnected with the first sub-channel 3 and the second sub-channel 4, and connected with the third sub-channel 5, and the second gas inlet channel 2 is controlled to be disconnected with the second sub-channel 4 and connected with the third sub-channel 5, that is, the gas to be measured can enter the third sub-channel 5, and the working gas can also enter the third sub-channel 5 through the second gas inlet channel 2, and then mixed in a certain proportion to enter the second proportional counter, and the tritium activity concentration is measured by the second proportional counter.

[0097] It should be noted that, exemplarily, the tritium monitor includes a fourth electromagnetic valve 23 and a fifth electromagnetic valve 24 in communication connection with the control module, and the control module controls the electromagnetic valves on the corresponding sub-channels to selectively guide the second gas inlet channel 2 to the second sub-channel 4 or the third sub-channel 5.

[0098] It should be noted that the specific type of working gas is not limited here, and exemplarily, for example, it can be argon, argon methane, methane, etc. The argon methane gas is composed of 10% methane and 90% argon.

[0099] In an embodiment, the second gas inlet channel 2 includes a compensation proportional counter tube, which is used to measure the environmental background count rate of the control working. That is, by setting a compensation proportional counter 21 on the second gas inlet channel 2, the working gas flows through the compensation proportional counter 21 and then enters the second sub-channel 4 or the third sub-channel 5, and then enters the first proportional counter and / or the second proportional counter, the compensation proportional counter 21 is used to measure the environmental background count rate, which reduces the interference of external factors on the measurement and improves the accuracy of the measurement.

[0100] In an embodiment, the tritium monitor includes proportional counter electronics in communication connection with the first proportional counter, the second proportional counter and the control module. The proportional counter electronics converts the pulse signals output by the first proportional counter and / or the second proportional counter into count rates, and sends the count rates to the control module.

[0101] In an embodiment, the tritium monitor comprises ionization chamber electronics, the ionization chamber electronics being in communication with the ionization chamber and the control module. The ionization chamber electronics converts the current signal output by the ionization chamber into a current value and sends the current value to the control module.

[0102] In an embodiment, the tritium monitor comprises a filter, a dryer and a gas pump arranged on the first gas inlet channel, and before the step of controlling the first sub-channel to be in communication with the first gas inlet channel, the method comprises:

[0103] The gas pump is controlled to make the to-be-tested gas flow through the filter, the dryer and the gas pump in sequence.

[0104] That is, under the action of the gas pump 13, the to-be-tested gas flows through the filter 11, the dryer 12 and the gas pump 13 in sequence. By arranging the gas pump 13, the to-be-tested gas can be sucked into the first gas inlet channel 1, so as to realize sampling of the to-be-tested gas, and by arranging the filter 11, the particles in the to-be-tested gas are removed, and by arranging the dryer 12, the to-be-tested gas is dried, so as to reduce the interference of external factors on the measurement and improve the accuracy of the measurement.

[0105] In an embodiment, referring to Figure 1 , the tritium monitor comprises a first flow controller 33 in communication with the control module, the first flow controller 33 being arranged on the first sub-channel 3 and being used to control the flow of the to-be-tested gas into the first sub-channel 3.

[0106] In an embodiment, referring to Figure 1 , the tritium monitor comprises a second flow controller 43 in communication with the control module, the second flow controller 43 being arranged on the second sub-channel 4 and being used to control the flow of the to-be-tested gas into the second sub-channel 4.

[0107] In an embodiment, referring to Figure 1 , the tritium monitor comprises a third flow controller 53 in communication with the control module, the third flow controller 53 being arranged on the third sub-channel 5 and being used to control the flow of the to-be-tested gas into the third sub-channel 5.

[0108] In a specific embodiment, the first gas inlet channel 1 comprises a filter 11, a dryer 12 and a gas pump 13, so as to realize the functions of sampling of air and removal of particles. The first sub-channel 3 comprises a first electromagnetic valve 32, a first flow controller 33 and an ionization chamber, which are used to test the tritium activity concentration range of 10 7 Bq / m 3 ~ 10 10 Bq / m 3The tritium monitor includes ionization chamber electronics, the ionization chamber electronics is in communication connection with the ionization chamber and the control module, the ionization chamber electronics converts the current signal output by the ionization chamber into a current value and sends the current value to the control module. 4 Bq / m 3 ~ 10 7 Bq / m 3 The tritium monitor includes ionization chamber electronics, the ionization chamber electronics is in communication connection with the ionization chamber and the control module, the ionization chamber electronics converts the current signal output by the ionization chamber into a current value and sends the current value to the control module. 2 Bq / m 3 ~ 10 4 Bq / m 3 The tritium monitor includes ionization chamber electronics, the ionization chamber electronics is in communication connection with the ionization chamber and the control module, the ionization chamber electronics converts the current signal output by the ionization chamber into a current value and sends the current value to the control module.

[0109] In order to realize the measurement of environmental level tritium gas, a low-activity proportional counter is arranged, and a composite shielding body and an electronic method for suppressing the background of the tritium measurement proportional counter are used at the same time, so that the background count rate is reduced, and the detection lower limit of the low-activity proportional counter reaches 10 2 Bq / m 3 .

[0110] In order to reduce the pollution of high-activity tritium gas to the low-activity tritium detector and the pipeline, the first sub-channel 3, the second sub-channel 4 and the third sub-channel 5 in the tritium monitor are physically separated, that is, the high-activity sub-channel, the medium-activity sub-channel and the low-activity sub-channel are physically separated, and the pollution of tritium gas to the low-activity proportional counter and the low-activity sub-channel is avoided through the conveying method of the measured gas.

[0111] In the description of the application, the description of the terms "in an embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the embodiments of the application. In the present application, the illustrative expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present application and the features of different embodiments or examples can be combined by those skilled in the art without contradiction.

[0112] The various embodiments / implementation forms provided by the present application can be combined with each other without contradiction.

[0113] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting the activity concentration of tritium gas for a tritium monitor, characterized by, The tritium monitor comprises a first air inlet channel, a control module, and a first sub-channel, a second sub-channel and a third sub-channel which are in communication with the first air inlet channel, the first sub-channel comprises a first detection device, the to-be-detected gas can enter the first sub-channel through the first air inlet channel, the first detection device is used for detecting the tritium activity concentration in the to-be-detected gas in the first sub-channel; the second sub-channel comprises a second detection device, the to-be-detected gas can enter the second sub-channel through the first air inlet channel, the second detection device is used for detecting the tritium activity concentration in the to-be-detected gas in the second sub-channel; the third sub-channel comprises a third detection device, the to-be-detected gas can enter the third sub-channel through the first air inlet channel, the third detection device is used for detecting the tritium activity concentration in the to-be-detected gas in the third sub-channel; the control module can control the on-off between the first sub-channel, the second sub-channel and the third sub-channel and the first air inlet channel, and is in communication connection with the first detection device, the second detection device and the third detection device; wherein the detection range of the first detection device is a first activity concentration, the detection range of the second detection device is a second activity concentration, the detection range of the third detection device is a third activity concentration, the first activity concentration is greater than the second activity concentration, and the third activity concentration is less than the second activity concentration; The detection method comprises: controlling the first sub-channel to be in communication with the first air inlet channel; controlling the to-be-detected gas to enter the first sub-channel from the first air inlet channel; detecting the tritium activity concentration in the to-be-detected gas by the first detection device; judging whether the tritium activity concentration in the to-be-detected gas is less than a first threshold value based on the detection result of the first detection device, wherein the first threshold value is the minimum value of the first activity concentration; if the tritium activity concentration in the to-be-detected gas is greater than or equal to the first threshold value, controlling the first air inlet channel to be in communication with the first sub-channel and disconnected with the second sub-channel; if the tritium activity concentration in the to-be-detected gas is less than the first threshold value, controlling the first air inlet channel to be disconnected with the first sub-channel and connected with the second sub-channel, and detecting the tritium activity concentration in the to-be-detected gas by the second detection device; judging whether the tritium activity concentration in the to-be-detected gas is less than a second threshold value based on the detection result of the second detection device, wherein the second threshold value is the minimum value of the second activity concentration; if the tritium activity concentration in the to-be-detected gas is greater than or equal to the second threshold value, controlling the first air inlet channel to be in communication with the second sub-channel and disconnected with the first sub-channel and the third sub-channel; if the tritium activity concentration in the to-be-detected gas is less than the second threshold value, controlling the first air inlet channel to be disconnected with the first sub-channel and the second sub-channel and connected with the third sub-channel, and detecting the tritium activity concentration in the to-be-detected gas by the third detection device.

2. The method of claim 1, wherein, The tritium monitor comprises a second gas inlet channel in communication with the third sub-channel, the tritium activity concentration in the to-be-tested gas is detected by the third detection device, and the method comprises the following steps: controlling working gas to enter the third sub-channel from the second gas inlet channel; controlling the working gas to enter the third detection device after being mixed with the to-be-tested gas at a certain ratio, wherein the third detection device is a second proportional counter.

3. The method of claim 1, wherein, The tritium monitor comprises a second gas inlet channel in communication with the second sub-channel, the tritium activity concentration in the to-be-tested gas is detected by the second detection device, and the method comprises the following steps: controlling working gas to enter the second sub-channel from the second gas inlet channel; controlling the working gas to enter the second detection device after being mixed with the to-be-tested gas at a certain ratio, wherein the second detection device is a first proportional counter.

4. The method of claim 1, wherein, said first activity concentration is in the range of 10 7 Bq / m 3 ~10 10 Bq / m 3 ; and / or, The second activity concentration is in the range of 10 4 Bq / m 3 ~10 7 Bq / m 3 ; and / or, The third activity concentration is in the range of 10 2 Bq / m 3 ~10 4 Bq / m 3 .

5. The method of claim 1, wherein, The tritium monitor comprises a filter, a dryer and a gas pump arranged on the first gas inlet channel, and before the step of controlling the first sub-channel to be in communication with the first gas inlet channel, the method comprises the following steps: controlling the gas pump to make the to-be-tested gas flow through the filter, the dryer and the gas pump in sequence.

6. The method of claim 2 or 3, wherein, The second gas inlet channel comprises a compensation proportional counter for measuring the environmental background count rate of the working control.

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