An on-line measuring device and method for the dose rate of tritium in the typical form in air

Abstract

The application discloses an on-line measuring device and method for typical form tritium radiation dose rate in air, which comprises a gas-water separation unit, an ionization chamber measuring unit and a processing display unit, wherein the gas-water separation unit is used for separating tritiated water and tritiated hydrogen in the to-be-measured gas, sending the penetrated tritiated water and tritiated hydrogen to the ionization chamber measuring unit, and sending the measured to-be-measured gas flow rate M 测 and the purging gas flow rate M 吹 to the processing display unit; the ionization chamber measuring unit is used for measuring the tritium activity concentration in the input gas and sending the tritium activity concentration A to the processing display unit; and the processing display unit is used for calculating and displaying the tritium radiation dose rate value D in air. The application can directly measure and further calculate the tritium radiation dose rate value in air, so that the on-site real-time measurement of the tritium radiation dose rate is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radioactive substance content measurement, in particular to an online measurement device and method for typical form tritium radiation dose rate in air. BACKGROUND

[0002] Tritium is a radioactive isotope of hydrogen, and tritium in air has multiple chemical forms, mainly tritiated hydrogen (HT) and tritiated water (HTO). Different forms of tritium have significant differences in radiation hazards to the human body. According to GB 18871-2002 Basic Standard for Protection against Ionizing Radiation and Safety of Radiation Sources, for the same activity concentration in air, tritiated water is about 10,000 times more harmful than tritiated hydrogen. The existing online measurement scheme for tritium concentration in air is mostly based on ionization chamber method or proportional counter method to measure total tritium content, and the obtained is the radioactivity concentration of tritium in air, which cannot be used to accurately evaluate tritium radiation dose. Some units and institutions have also studied the discrimination measurement and discrimination sampling of multi-form tritium. For example, the China Academy of Engineering Physics has studied the online discrimination measurement technology of tritiated hydrogen and tritiated water based on Nafion gas-water separation membrane method. The Shanghai Institute of Applied Physics of the Chinese Academy of Sciences has studied the discrimination sampling technology of tritiated hydrogen, tritiated water and tritiated methane by using Nafion membrane gas-water separation, gradient cold trap, catalytic oxidation and other methods. However, the online measurement of different forms of tritium requires catalytic oxidation of tritiated hydrogen and hydrogen supplement, and requires a double ionization chamber measurement system, resulting in a complex device structure and a large volume, which is not suitable for portable measurement. The discrimination sampling of different forms of tritium requires laboratory analysis of the sample, which has a long measurement period and cannot quickly provide tritium radiation dose on site. SUMMARY

[0003] The present application aims to provide an online measurement device and method for typical form tritium radiation dose rate in air to solve the problem of on-site rapid measurement of tritium radiation dose in air in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] According to an embodiment of the present application, an online measurement device for typical form tritium radiation dose rate in air is provided, which comprises a gas-water separation unit, an ionization chamber measurement unit and a processing and display unit, wherein:

[0006] The gas-water separation unit is connected with the ionization chamber measurement unit and the processing and display unit, and is used to separate tritiated water and tritiated hydrogen in the to-be-measured gas, send the separated tritiated water and tritiated hydrogen to the ionization chamber measurement unit, and send the measured to-be-measured gas flow rate M 测 and the purge gas flow rate M 吹 to the processing and display unit.

[0007] The ionization chamber measurement unit is connected to the processing and display unit and is used to measure the tritium activity concentration in the input gas and send the measured tritium activity concentration A to the processing and display unit.

[0008] The processing and display unit is used to determine the gas flow rate M to be measured. 测 , Purging gas velocity M 吹 Tritium activity concentration A, and the known permeability λ of the gas-liquid separation unit to tritized water. HTO The effective dose e(g) resulting from a unit intake of tritium-infused water via inhalation. HTO The human breathing rate L is used to calculate the tritium radiation dose rate D in the air, and the calculation results are displayed.

[0009] In one embodiment of the present invention, the processing and display unit calculates the tritium radiation dose rate value D in the air using the following formula:

[0010]

[0011] In one embodiment of the present invention, the gas-liquid separation unit includes a gas inlet pipe for the gas to be tested, a purge gas cylinder, a purge gas inlet pipe, a gas-liquid separation pipe, a sleeve, a first flow meter, a first vacuum pump, a first exhaust pipe, a second flow meter, a second vacuum pump, and a second exhaust pipe, wherein:

[0012] The gas to be tested inlet pipe, the first flow meter, the gas-liquid separator, the first pump 7, and the first exhaust pipe are connected in sequence, so that the gas to be tested enters the gas-liquid separator through the gas inlet pipe and the first flow meter under the action of the first pump, and is finally discharged through the first exhaust pipe. The first flow meter is used to measure the instantaneous flow rate of the gas to be tested to obtain the gas velocity M. 测 The gas-water separation tube is used to separate tritized water and tritized hydrogen in the gas to be tested.

[0013] The first flow meter is connected to the processing and display unit and is used to send the obtained gas flow rate to be measured to the processing and display unit.

[0014] The sleeve is placed around the gas-water separator and is used to collect the tritized water and tritized hydrogen that permeate from the gas-water separator.

[0015] The purge gas cylinder, the purge gas inlet pipeline, the second flow meter and the sleeve are sequentially connected, so that the purge gas in the purge gas cylinder is carried into the sleeve by the second air pump, and the tritiated water and tritiated hydrogen in the sleeve are carried to the ionization chamber measurement unit, and finally discharged through the second exhaust pipeline, wherein the second flow meter is used for measuring the instantaneous flow of the purge gas to obtain the purge gas flow rate M 吹 ;

[0016] The second flow meter is connected with the processing display unit, and is used for sending the obtained purge gas flow rate M 吹 to the processing display unit.

[0017] In an embodiment of the present application, the pipe wall of the gas-water separation pipe is made of a hydrophilic film material, the hydrophilic film material has high permeability to tritiated water and low permeability to tritiated hydrogen, and the ratio of the permeation efficiency of tritiated water to tritiated hydrogen is equal to the ratio of the effective dose e(g) caused by the inhalation unit intake of the two forms of tritium.

[0018] In an embodiment of the present application, the purge gas in the purge gas cylinder is a non-radioactive gas.

[0019] In an embodiment of the present application, the ionization chamber measurement unit comprises an ionization chamber and an electrometer connected in sequence, wherein:

[0020] The ionization chamber is used for converting the tritium radioactivity carried in the purge gas into a current signal;

[0021] The electrometer is connected with the processing display unit, and is used for measuring the current signal output by the ionization chamber to obtain the tritium activity concentration A, and sending the obtained tritium activity concentration A to the processing display unit.

[0022] In an embodiment of the present application, the ionization chamber is a flow gas ionization chamber.

[0023] According to another embodiment of the present application, an online measurement method of a typical form of tritium radiation dose rate in air is also provided, the method comprising the following steps:

[0024] Step S1, starting the first air pump, and carrying the to-be-measured gas into the gas-water separation pipe through the to-be-measured gas inlet pipeline and the first flow meter to record the instantaneous flow of the to-be-measured gas, and then carrying out tritiated water and tritiated hydrogen permeation separation, and then discharging through the first exhaust pipeline, and the first flow meter sends the to-be-measured gas flow rate M 测 to the processing display unit;

[0025] Step S2, open the purge gas cylinder and the second air pump, the second air pump will be brought into the sleeve outside the gas-water separation tube, and the tritiated water and tritiated hydrogen from the gas-water separation tube will be carried to the ionization chamber measurement unit, and then discharged through the second exhaust pipe, the second flowmeter will get the flow rate M of the purge gas 吹 Send to the processing display unit;

[0026] Step S3, open the ionization chamber measurement unit, use the ionization chamber in the ionization chamber measurement unit to measure the tritium activity concentration in the input gas, and send the measured tritium activity concentration A to the processing display unit;

[0027] Step S4, open the processing display unit, receive the flow rate M of the gas to be measured sent by the first flowmeter 测 , the flow rate M of the purge gas sent by the second flowmeter 吹 , the tritium activity concentration A sent by the ionization chamber measurement unit, combine the known permeability of the gas-water separation unit to tritiated water λ HTO , the effective dose e(g) caused by the inhalation of unit intake of tritiated water HTO , the breathing rate L of the person, calculate the tritium radiation dose rate value D in the air, and display the calculation result.

[0028] In an embodiment of the present application, the processing display unit calculates the tritium radiation dose rate value D in the air by the following formula:

[0029]

[0030] The beneficial effects of the present application are:

[0031] The present application can directly measure and further calculate the tritium radiation dose rate value in the air, thereby realizing the on-site real-time measurement of the tritium radiation dose rate. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural block diagram of an online measurement device for typical form tritium radiation dose rate in air according to an embodiment of the present application;

[0033] Figure 2 is a flow chart of an online measurement method for typical form tritium radiation dose rate in air according to an embodiment of the present application.

[0034] MARKED FOR EXPLANATION:

[0035] 1 - gas inlet pipeline of the gas to be measured; 2 - purge gas cylinder; 3 - purge gas inlet pipeline; 4 - gas-water separation pipeline; 5 - sleeve; 61 - first flow meter; 62 - second flow meter; 7 - first air suction pump; 8 - first exhaust pipeline; 9 - ionization chamber measuring unit; 10 - processing and display unit; 11 - second air suction pump; 12 - second exhaust pipeline. DETAILED DESCRIPTION

[0036] To make the objects, technical solutions and effects of the present application clearer and more explicit, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0037] According to an embodiment of the present application, an on-line measuring device for typical form tritium radiation dose rate in air is disclosed. Figure 1 is a structural block diagram of an on-line measuring device for typical form tritium radiation dose rate in air according to an embodiment of the present application, as shown in Figure 1 The on-line measuring device for typical form tritium radiation dose rate in air comprises a gas-water separation unit, an ionization chamber measuring unit and a processing and display unit, wherein:

[0038] The gas-water separation unit is connected with the ionization chamber measuring unit and the processing and display unit, and is used for performing permeation separation on tritiated water and tritiated hydrogen in the gas to be measured, sending the permeated tritiated water and tritiated hydrogen to the ionization chamber measuring unit, and sending the measured gas flow rate M 测 and the purge gas flow rate M 吹 to the processing and display unit;

[0039] The ionization chamber measuring unit is connected with the processing and display unit, and is used for measuring the tritium activity concentration in the input gas, and sending the measured tritium activity concentration A (Bq / m 3 ) to the processing and display unit;

[0040] The processing and display unit is used for calculating the tritium radiation dose rate value D (Sv / h) in air according to the received gas flow rate M 测 , the purge gas flow rate M 吹 , the tritium activity concentration A, and the known permeation rate λ HTO of the gas-water separation unit to tritiated water, the effective dose per unit intake e (g) HTO (Sv / Bq) of tritiated water inhalation, and the personnel breathing rate L (m 3 / h), and displaying the calculation result.

[0041] In an embodiment of the present application, the processing and display unit calculates the tritium radiation dose rate value D in air by using the following formula:

[0042]

[0043] In an embodiment of the present application, the gas-water separation unit comprises a test gas inlet pipeline 1, a purge gas cylinder 2, a purge gas inlet pipeline 3, a gas-water separation pipeline 4, a sleeve 5, a first flow meter 61, a first air pump 7, a first exhaust pipeline 8, a second flow meter 62, a second air pump 11 and a second exhaust pipeline 12, wherein:

[0044] The test gas inlet pipeline 1, the first flow meter 61, the gas-water separation pipeline 4, the first air pump 7 and the first exhaust pipeline 8 are connected in sequence, so that the test gas enters the gas-water separation pipeline 4 through the test gas inlet pipeline 1 and the first flow meter 61 under the action of the first air pump 7, and is finally discharged through the first exhaust pipeline 8, wherein the first flow meter 61 is used to measure the instantaneous flow of the test gas to obtain the test gas flow rate M 测 (m 3 / h), and the gas-water separation pipeline 4 is used to perform permeation separation on tritiated water and tritiated hydrogen in the test gas;

[0045] The first flow meter 61 is connected with a processing and display unit, and is used to send the obtained test gas flow rate M 测 to the processing and display unit;

[0046] The sleeve 5 is arranged at the periphery of the gas-water separation pipeline 4, and is used to contain tritiated water and tritiated hydrogen permeated from the gas-water separation pipeline 4;

[0047] The purge gas cylinder 2, the purge gas inlet pipeline 3, the second flow meter 62 and the sleeve 5 are connected in sequence, so that the purge gas contained in the purge gas cylinder 2 enters the sleeve 5 through the purge gas inlet pipeline 3 and the second flow meter 62 under the action of the second air pump 11, carries the tritiated water and tritiated hydrogen contained in the sleeve 5 and permeated from the gas-water separation pipeline 4 to the ionization chamber measurement unit 9, and is finally discharged through the second exhaust pipeline 12, wherein the second flow meter 62 is used to measure the instantaneous flow of the purge gas to obtain the purge gas flow rate M 吹 (m 3 / h);

[0048] The second flow meter 62 is connected with a processing and display unit, and is used to send the obtained purge gas flow rate M 吹 to the processing and display unit.

[0049] In an embodiment of the present application, the pipe wall of the gas-water separation pipe 4 is made of a hydrophilic film material, such as Nafion film, which has high permeability to tritiated water and low permeability to tritiated hydrogen, and is selected or customized to have a permeability ratio of tritiated water to tritiated hydrogen equal to the ratio of the effective dose e(g) caused by the inhalation unit intake of the two forms of tritium. In practical applications, the permeability of the hydrophilic film material to tritiated water λ HTO can be determined by pre-test, and then the permeability of the hydrophilic film material to tritiated hydrogen can be obtained according to the ratio of the effective dose e(g) caused by the inhalation unit intake of tritiated water and tritiated hydrogen.

[0050] In an embodiment of the present application, the purge gas in the purge gas cylinder 2 can be a non-radioactive gas such as nitrogen or argon.

[0051] In an embodiment of the present application, the ionization chamber measurement unit 9 includes an ionization chamber and an electrometer connected in sequence, wherein:

[0052] The ionization chamber is used to convert the tritium radioactivity carried by the purge gas into a current signal;

[0053] The electrometer is connected with the processing and display unit, and is used to measure the current signal output by the ionization chamber to obtain the tritium activity concentration A (Bq / m 3 ), and send the obtained tritium activity concentration A to the processing and display unit.

[0054] In an embodiment of the present application, the ionization chamber can be a flow gas ionization chamber.

[0055] When the online measurement device for the typical form of tritium radiation dose rate in air is working, the to-be-measured gas enters the gas-water separation pipe 4 through the to-be-measured gas inlet pipeline 1 and the first flow meter 61 under the action of the first air pump 7, and is finally discharged through the first exhaust pipeline 8. When flowing through the first flow meter 61, the instantaneous flow of the to-be-measured gas is measured by the first flow meter 61 to obtain the to-be-measured gas flow rate M 测 (m 3 / h), and the to-be-measured gas flow rate M 测The gas is sent to the processing and display unit. As it flows through the gas-liquid separator 4, the gas to be tested passes through the gas-liquid separator 4 according to its respective permeation efficiency, achieving the separation of tritized water and tritized hydrogen in the gas. The permeated tritized water and tritized hydrogen fill the sleeve 5 surrounding the gas-liquid separator 4. The purge gas contained in the purge gas cylinder 2, under the action of the second suction pump 11, enters the sleeve 5 through the purge gas inlet pipe 3 and the second flow meter 62, carrying the tritized water and tritized hydrogen permeated from the gas-liquid separator 4 to the ionization chamber measurement unit 9, and finally exits through the second exhaust pipe 12. When the purge gas flows through the second flow meter 62, the instantaneous flow rate of the purge gas is measured by the second flow meter 62 to obtain the purge gas velocity M. 吹 (m 3 / h), and the gas flow rate M to be measured 测 The data is sent to the processing and display unit. At the ionization chamber measurement unit 9, the tritium activity concentration in the input gas is measured, and the measured tritium activity concentration A is sent to the processing and display unit. Finally, the processing and display unit processes the data based on the received gas flow rate M. 测 , Purging gas velocity M 吹 Tritium activity concentration A, and the known permeability λ of the gas-liquid separation unit to tritized water. HTO The effective dose e(g) resulting from a unit intake of tritium-infused water via inhalation. HTO The human breathing rate L is used to calculate the tritium radiation dose rate D in the air, and the calculation results are displayed.

[0056] According to another embodiment of the present invention, an online measurement method for the dose rate of tritium radiation in typical forms in air is also disclosed, such as... Figure 2 As shown, the method includes the following steps:

[0057] Step S1: Turn on the first suction pump 7, and draw the gas to be tested through the gas inlet pipe 1. After the instantaneous flow rate of the gas to be tested is recorded by the first flow meter 61, the gas is drawn into the gas-water separator 4 for permeation separation of tritized water and tritized hydrogen. Then, the gas is discharged through the first exhaust pipe 8. The first flow meter 61 will obtain the flow rate M of the gas to be tested. 测 Send to the processing and display unit 10;

[0058] Step S2: Turn on the purge gas cylinder 2 and the second suction pump 11. The second suction pump 11 carries the purge gas contained in the purge gas cylinder 2 through the purge gas inlet pipe 3, and after the instantaneous flow rate of the purge gas is recorded by the second flow meter 62, it carries the purge gas into the sleeve 5 around the gas-water separator 4. It also carries the tritized water and tritized hydrogen that have passed through the gas-water separator 4 to the ionization chamber measurement unit 9, and then discharges it through the second exhaust pipe 12. The second flow meter 62 will obtain the purge gas flow rate M. 吹 Send to the processing and display unit 10;

[0059] Step S3, the ionization chamber measurement unit 9 is started, the tritium activity concentration in the input gas is measured by the ionization chamber in the ionization chamber measurement unit 9, and the measured tritium activity concentration A is sent to the processing and display unit 10;

[0060] Step S4, the processing and display unit 10 is started, the tritium activity concentration A sent by the ionization chamber measurement unit 9 is received, and the tritium activity concentration A is sent to the processing and display unit 10; 测 Step S4, the processing and display unit 10 is started, the tritium activity concentration A sent by the ionization chamber measurement unit 9 is received, and the tritium activity concentration A is sent to the processing and display unit 10; 吹 Step S4, the processing and display unit 10 is started, the tritium activity concentration A sent by the ionization chamber measurement unit 9 is received, and the tritium activity concentration A is sent to the processing and display unit 10; HTO Step S4, the processing and display unit 10 is started, the tritium activity concentration A sent by the ionization chamber measurement unit 9 is received, and the tritium activity concentration A is sent to the processing and display unit 10; HTO Step S4, the processing and display unit 10 is started, the tritium activity concentration A sent by the ionization chamber measurement unit 9 is received, and the tritium activity concentration A is sent to the processing and display unit 10;

[0061] In an embodiment of the present application, the processing and display unit 10 calculates the tritium radiation dose rate value D in the air by the following formula:

[0062]

[0063] The present application can directly measure and further calculate the tritium radiation dose rate value in the air, thereby realizing the on-site real-time measurement of the tritium radiation dose rate.

[0064] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An on-line measuring device of the dose rate of tritium in the typical form in air, characterized in that, The device comprises a gas-water separation unit, an ionization chamber measurement unit and a processing display unit, wherein: The gas-liquid separation unit is connected to the ionization chamber measurement unit and the processing and display unit. It is used to perform permeation separation of tritized water and tritized hydrogen in the gas to be tested, sending the permeated tritized water and tritized hydrogen to the ionization chamber measurement unit, and displaying the measured gas flow rate M. 测 and the purge gas velocity M 吹 The data is sent to the processing and display unit, wherein the permeability λ of the gas-water separation unit to tritized water is... HTO The permeability λ of hydrogen tritium to the gas-liquid separation unit HT The effective dose e(g) resulting from a unit intake of tritium-treated water is compared to that from inhalation. HTO The cumulative effective dose e(g) resulting from a unit intake of hydrogen tritide inhalation. HT The ratios are equal; The ionization chamber measurement unit is connected with the processing display unit, for measuring the tritium activity concentration in the input gas, and sending the measured tritium activity concentration A to the processing display unit; The processing display unit is used to calculate the tritium activity concentration A of the tritiated water in the gas-water separation unit according to the received measured gas flow rate M 测 , the purge gas flow rate M 吹 , the tritium activity concentration A, and the known tritiated water permeability λ of the gas-water separation unit HTO , the tritiated water inhalation unit intake amount caused by the effective dose e(g) HTO , the personnel breathing rate L, and the calculated air tritium radiation dose rate value D: And display the calculation results.

2. The apparatus of claim 1, wherein, The gas-water separation unit comprises a to-be-measured gas inlet pipeline, a purge gas cylinder, a purge gas inlet pipeline, a gas-water separation pipe, a sleeve, a first flow meter, a first air pump, a first exhaust pipeline, a second flow meter, a second air pump and a second exhaust pipeline, wherein: The to-be-tested gas inlet pipeline, the first flow meter, the gas-water separation pipe, the first air extraction pump 7 and the first exhaust pipeline are sequentially connected, so that the to-be-tested gas enters the gas-water separation pipe through the to-be-tested gas inlet pipeline and the first flow meter under the action of the first air extraction pump, and is finally discharged through the first exhaust pipeline, wherein the first flow meter is used for measuring the instantaneous flow of the to-be-tested gas to obtain the to-be-tested gas flow rate M 测 The gas-water separation pipe is used for performing permeation separation on the tritiated water and tritiated hydrogen in the to-be-tested gas. The first flow meter is connected with the processing display unit, for sending the obtained to-be-measured gas flow rate to the processing display unit; The sleeve is arranged outside the gas-water separation pipe, for containing the tritiated water and tritiated hydrogen emitted by the gas-water separation pipe; The purge gas cylinder, the purge gas inlet pipeline, the second flow meter and the sleeve are sequentially connected, so that the purge gas contained in the purge gas cylinder is under the action of the second air pump, enters the sleeve through the purge gas inlet pipeline and the second flow meter, and carries the tritiated water and tritiated hydrogen contained in the sleeve and permeated from the gas-water separation pipe to the ionization chamber measurement unit, and is finally discharged through the second exhaust pipeline, wherein the second flow meter is used for measuring the instantaneous flow of the purge gas to obtain the purge gas flow rate M 吹 ; The second flow meter is connected with the processing display unit, for sending the obtained purge gas flow rate M 吹 to the processing display unit.

3. The apparatus of claim 2, wherein, The pipe wall of the gas-water separation pipe is made of a hydrophilic film material, the hydrophilic film material has high permeability to tritiated water and low permeability to tritiated hydrogen, and the ratio of the permeability of the tritiated water and the tritiated hydrogen to the effective dose e(g) caused by the inhalation of one unit of the two forms of tritium is equal.

4. The apparatus of claim 2, wherein, The purge gas contained in the purge gas cylinder is a non-radioactive gas.

5. The apparatus of claim 2, wherein, The ionization chamber measurement unit comprises an ionization chamber and an electrometer connected in sequence, wherein: The ionization chamber is used for converting the tritium radioactivity carried by the purge gas into an electric current signal; The electrometer is connected with the processing display unit, for measuring the electric current signal output by the ionization chamber to obtain the tritium activity concentration A, and sending the obtained tritium activity concentration A to the processing display unit.

6. The apparatus of claim 5, wherein, The ionization chamber is a flow gas ionization chamber.

7. A method for on-line measurement of the dose rate of tritium in the typical form in air, characterized by, The method comprises the following steps: Step S1, open the first air pump, the gas to be measured through the gas to be measured gas inlet pipeline, and through the first flowmeter to record the instantaneous flow of the gas to be measured, then into the gas-water separation pipe for tritiated water and tritiated hydrogen permeation separation, then through the first exhaust pipeline, the first flowmeter will get the flow rate M 测 to the processing display unit, wherein the gas-water separation pipe has a permeability λ HTO to the processing display unit, wherein the gas-water separation pipe has a permeability λ HT The ratio of the effective dose e(g) caused by the unit intake of tritiated water HTO The ratio of the effective dose e(g) caused by the unit intake of tritiated hydrogen HT The ratio of the effective dose e(g) caused by the unit intake of tritiated water Step S2, open the purge gas cylinder and the second pump, the second pump will be filled with purge gas in the purge gas cylinder through the purge gas inlet pipeline, and record the instantaneous flow of purge gas through the second flow meter, and then enter the sleeve outside the gas-water separation tube, and carry the tritiated water and tritiated hydrogen from the gas-water separation tube to the ionization chamber measurement unit, and then discharge through the second exhaust pipeline. The second flow meter will get the purge gas flow rate M 吹 Send to the processing display unit; Step S3, turn on the ionization chamber measurement unit, use the ionization chamber in the ionization chamber measurement unit to measure the tritium activity concentration in the input gas, and send the measured tritium activity concentration A to the processing display unit; Step S4, turn on the processing display unit, receive the flow rate M of the gas to be measured sent by the first flow meter 测 , the flow rate M of the purge gas sent by the second flow meter 吹 , the tritium activity concentration A sent by the ionization chamber measurement unit, combined with the known tritiated water permeability λ of the gas-water separation unit HTO , the effective dose e(g) caused by the tritiated water inhalation unit intake HTO , the tritium radiation dose rate value D in the air calculated by the personnel breathing rate L: And display the calculation result.

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