Radioactive elemental iodine synthesis and feeding system and method

Abstract

The invention provides a radioactive elemental iodine synthesis and feeding system which comprises a radioactive elemental iodine synthesis unit, a dilution unit, a detection unit and an iodine adsorption test unit, the radioactive elemental iodine synthesis unit is used for synthesizing radioactive elemental iodine; the dilution unit is used for providing dilution gas for the synthesized radioactive elemental iodine and diluting the radioactive elemental iodine synthesized by the radioactive elemental iodine synthesis unit; the detection unit is arranged in front of the iodine adsorption test unit and is used for detecting parameters of test airflow entering the iodine adsorption test unit; and the iodine adsorption test unit is used for adsorbing the test airflow containing the radioactive elemental iodine and carrying out an iodine adsorption test. The invention also provides a synthesis and feeding method of the radioactive elemental iodine.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear industry, and in particular to a synthesis and feeding system and method of radioactive elemental iodine. Background Art

[0002] According to the standard test method requirements of ASTM D 3803 nuclear-grade activated carbon of the American Society for Testing and Materials, in the evaluation test of the elemental iodine retention capacity of activated carbon (or other adsorbents) at 180°C, it is first necessary to feed the adsorbent so that the adsorbent adsorbs a certain amount of radioactive elemental iodine, and then continuously purge the adsorbent with airflow at a high temperature of 180°C to examine the adsorbent's retention capacity for the adsorbed radioactive elemental iodine.

[0003] To complete the feeding of the adsorbent, it is necessary to synthesize radioactive elemental iodine. Radioactive elemental iodine faces three main problems during the synthesis process: first, due to the volatility of elemental iodine, it is easy to corrode pipelines, containers and instruments; second, radioactive elemental iodine and sodium iodide need to maintain the integrity of the sealing of the entire test system including containers and pipelines during use; third, there is the problem of liquid backflow caused by the imbalance of system air pressure at the moment the test ends.

[0004] In order to solve the above problems existing in the current process of synthesizing and feeding radioactive elemental iodine, a system and method for synthesizing and feeding radioactive elemental iodine is urgently needed. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention aims to provide a synthesis and feeding system and method for radioactive elemental iodine.

[0006] To achieve the above object, in a first aspect of the present invention, a synthesis and feeding system of radioactive elemental iodine is provided, comprising a radioactive elemental iodine synthesis unit, a dilution unit, a detection unit and an iodine adsorption test unit;

[0007] The radioactive elemental iodine synthesis unit is used to synthesize radioactive elemental iodine;

[0008] The dilution unit is used to provide dilution gas for the synthesized radioactive elemental iodine, and dilute the radioactive elemental iodine synthesized by the radioactive elemental iodine synthesis unit;

[0009] The detection unit is arranged before the iodine adsorption test unit and is used to detect the parameters of the test airflow entering the iodine adsorption test unit, the parameters including the temperature and pressure of the airflow;

[0010] The iodine adsorption test unit is used to adsorb the test airflow containing radioactive elemental iodine and conduct iodine adsorption test;

[0011] Among them, the radioactive elemental iodine synthesis unit includes a first air inlet branch, a first reagent bottle assembly, a first connecting air path, a buffer bottle assembly, a second connecting air path, a second reagent bottle assembly, a third connecting air path, and an acrylic glove box, which are connected in sequence. The first reagent bottle assembly is used to contain elemental iodine, and the second reagent bottle assembly is used to contain a saturated elemental iodine solution of potassium iodide containing radioactive sodium iodide. The acrylic glove box is respectively attached with a vacuum gauge and a vacuum pump.

[0012] In an embodiment of the first aspect, the first reagent bottle assembly includes a first reagent bottle and a first reagent bottle cap, the air inlet of the first reagent bottle assembly is close to the bottom of the first reagent bottle, and the air outlet of the first reagent bottle assembly is flush with the inner surface of the first reagent bottle cap.

[0013] In an embodiment of the first aspect, the second reagent bottle assembly includes a second reagent bottle and a second reagent bottle cap, the air inlet of the second reagent bottle assembly is close to the bottom of the second reagent bottle and is located below the liquid level of the solution therein, and the air outlet of the second reagent bottle assembly is flush with the inner surface of the second reagent bottle cap.

[0014] In an embodiment of the first aspect, the buffer bottle assembly includes a buffer bottle and a buffer bottle cap, the air inlet of the buffer bottle assembly is flush with the inner surface of the buffer bottle cap, and the air outlet of the buffer bottle assembly is located lower than the air inlet.

[0015] In an embodiment of the first aspect, a mass flow meter is provided in both the first air intake branch and the second air intake branch, and the mass flow meter is configured to control and adjust the flow rate of the fluid passing through the mass flow meter so that the concentration of the synthesized radioactive elemental iodine meets the set requirements.

[0016] In the implementation manner of the first aspect, check valves are respectively installed on the second connecting gas path and the second air intake branch path.

[0017] In an implementation of the first aspect, the first reagent bottle assembly, the second reagent bottle assembly, the buffer bottle assembly and related gas circuits are made of polytetrafluoroethylene.

[0018] In an implementation of the first aspect, the first reagent bottle assembly, the buffer bottle assembly, and the second reagent bottle assembly are installed in an acrylic glove box through a fixed base, wherein the fixed base is made of silicone material and is provided with a circular groove with a depth of not less than 5 cm.

[0019] In an embodiment of the first aspect, the iodine adsorption test unit includes a test bed and a backup bed. The test bed is filled with iodine removal adsorbent, and the depth of the test bed is not less than 25 mm. The backup bed is filled with nuclear-grade activated carbon with qualified iodine removal efficiency, and the depth of the backup bed is not less than 50 mm.

[0020] To achieve the above object, in a second aspect of the present invention, a method for synthesizing and feeding radioactive elemental iodine using the above-mentioned synthesis and feeding system of radioactive elemental iodine is provided, comprising the following steps:

[0021] Add elemental iodine to the first reagent bottle, add a saturated solution of elemental iodine of potassium iodide to the second reagent bottle, and tighten the bottle caps;

[0022] Turn on the vacuum pump to ensure that the acrylic glove box is under a slight negative pressure condition, add the radioactive iodine compound into the second reagent bottle containing the saturated solution of elemental iodine of potassium iodide through a syringe and quickly tighten the bottle cap;

[0023] Nitrogen is supplied to the first air inlet branch and the second air inlet branch respectively through a mass flow meter at a set flow rate. The radioactive elemental iodine-containing gas flow synthesized by the system is diluted by the nitrogen in the dilution unit and sent to the test bed for adsorbent capture to complete the feeding. Among them, after entering the first air inlet branch, the nitrogen flow passes through the first reagent bottle assembly, the buffer bottle assembly and the second reagent bottle assembly in sequence to promote the synthesis reaction of radioactive elemental iodine.

[0024] The synthesis and feeding system and method of radioactive elemental iodine of the present invention have the following beneficial effects compared with the prior art:

[0025] (1) Design and install the pipelines and containers required for the synthesis of radioactive elemental iodine in an acrylic glove box, and connect the containers and pipelines using corrosion-resistant quick plug-ins;

[0026] (2) Installing a buffer tank and an anti-corrosion check valve on the system pipeline can effectively prevent and avoid the intrusion of air and liquid backflow caused by the imbalance of gas pressure in the system pipeline.

[0027] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 A schematic diagram of a synthesis and feeding system of radioactive elemental iodine according to the present invention;

[0030] Figure 2 This is a schematic diagram of an acrylic glove box;

[0031] Figure 3 The figure is a block diagram of the synthesis and supply method of radioactive elemental iodine according to the present invention. DETAILED DESCRIPTION

[0032] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0033] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0034] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0035] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 The synthesis and supply system of radioactive elemental iodine of the present invention is shown, comprising a radioactive elemental iodine synthesis unit, a dilution unit, a detection unit and an iodine adsorption test unit.

[0038] The radioactive elemental iodine synthesis unit is used to synthesize radioactive elemental iodine.

[0039] The dilution unit is used to provide dilution gas for synthesized radioactive elemental iodine, and dilute the radioactive elemental iodine synthesized by the radioactive elemental iodine synthesis unit.

[0040] The detection unit is arranged before the iodine adsorption test unit and is used to detect the parameters of the test air flow entering the iodine adsorption test unit.

[0041] The iodine adsorption test unit is used to adsorb the test gas flow containing radioactive elemental iodine and conduct iodine adsorption test.

[0042] Specifically, the radioactive elemental iodine synthesis unit includes a first air inlet branch Gs1, a first reagent bottle assembly 10, a first connecting air circuit C1, a buffer bottle assembly 20, a second connecting air circuit C2, a second reagent bottle assembly 30, a third connecting air circuit C3, and an acrylic glove box 40.

[0043] The first air inlet branch Gs1, the first reagent bottle assembly 10, the first connecting air circuit C1, the buffer bottle assembly 20, the second connecting air circuit C2, the second reagent bottle assembly 30 and the third connecting air circuit C3 are connected in sequence, wherein the first reagent bottle assembly 10 contains elemental iodine, the second reagent bottle assembly 30 contains a saturated elemental iodine solution of potassium iodide containing radioactive sodium iodide, and the buffer bottle assembly 20 is located between the first reagent bottle assembly 10 filled with elemental iodine and the second reagent bottle assembly 30 filled with a saturated elemental iodine solution of potassium iodide. When the iodine-carrying airflow enters the buffer bottle assembly 20, the free space in the buffer bottle assembly 20 can make the elemental iodine concentration in the iodine-carrying airflow more uniform. At the same time, the presence of the buffer bottle assembly 20 can prevent the risk of radioactive liquid backflowing into the iodine-carrying reagent bottle caused by the instantaneous cessation of the airflow.

[0044] The first reagent bottle assembly 10 includes a first reagent bottle 10a and a first reagent bottle cap 10b, preferably, one end of the first air inlet branch Gs1 passes through the first reagent bottle cap 10b and goes deep into the first reagent bottle 10a, close to the bottom of the first reagent bottle 10a, to form the air inlet of the first reagent bottle 10a, and the other end of the first air inlet branch Gs1 is connected to a nitrogen source (not shown). It should be noted that the first reagent bottle 10a is used to accommodate elemental iodine, and thus, one end of the first connecting air path C1 connecting the first reagent bottle assembly 10 and the buffer bottle assembly 20 forms the air outlet of the first reagent bottle 10a, which passes through the first reagent bottle cap 10b and is communicated with the internal fluid of the first reagent bottle 10a, and preferably the air outlet is flush with the inner surface of the first reagent bottle cap 10b. In this way, when nitrogen enters the first reagent bottle 10a through the first air inlet branch Gs1, elemental iodine can quickly escape from the air outlet to the subsequent air path for subsequent reaction.

[0045] The buffer bottle assembly 20 includes a buffer bottle 20a and a buffer bottle cap 20b. The other end of the first connecting air path passes through the buffer bottle cap 20b to form an air inlet of the buffer bottle 20a. The air inlet of the buffer bottle 20a is flush with the inner surface of the buffer bottle cap 20b. One end of the second connecting air path C2 passes through the buffer bottle cap 20b and extends into the interior of the buffer bottle 20a to form an air outlet of the buffer bottle 20a. It can be seen that the position of the air outlet of the buffer bottle 20a is lower than the position of the air inlet so as to better play a role in airflow buffering.

[0046] The second reagent bottle assembly 30 includes a second reagent bottle 30a and a second reagent bottle cap 30b, the other end of the second connecting gas path C2 passes through the second reagent bottle cap 30b and goes deep into the second reagent bottle 30a, close to the bottom of the second reagent bottle 30a and below the liquid level of the solution therein, forming an air inlet of the second reagent bottle 30a, and one end of the third connecting gas path C3 passes through the second reagent bottle cap 30b to form an air outlet of the second reagent bottle 30a, which is flush with the inner surface of the second reagent bottle cap 30b. The second reagent bottle 30a is used to accommodate a potassium iodide elemental iodine saturated solution containing radioactive sodium iodide, so that when the iodine-carrying nitrogen gas flow enters the solution, it will not dissolve but will undergo an isotope exchange reaction with the radioactive sodium iodide in the solution to produce radioactive elemental iodine and flow out with the carrier gas, that is, synthesize radioactive elemental iodine.

[0047] Preferably, a check valve is installed on the second connecting gas circuit C2 to prevent liquid backflow caused by unbalanced gas pressure in the system pipeline.

[0048] Since radioactive elemental iodine is synthesized in the second reagent bottle assembly 30, the first reagent bottle assembly 10, the buffer bottle assembly 20, the second reagent bottle assembly 30 and the related gas circuits are arranged inside the acrylic glove box 40. This can meet the radiation safety protection requirements during the synthesis of radioactive elemental iodine, because the acrylic glove box 40 can ensure that the synthesis environment of radioactive elemental iodine can be carried out in a closed space.

[0049] The acrylic glove box 40 is made of acrylic sheets bonded by special adhesives to form a cubic or rectangular enclosed space. The front of the acrylic glove box 40 has two operating hand holes, and one side of the glove box (either the left or the right side) has a side door and a small hole. There are two small holes on the top of the acrylic glove box 40. One small hole is attached with a vacuum gauge, and the other small hole is connected to a vacuum pump through a pipeline and connected to a filter device, such as Figure 2 shown.

[0050] Preferably, the first reagent bottle assembly 10, the buffer bottle assembly 20, and the second reagent bottle assembly 30 are installed in the acrylic glove box 40 through a fixed base, wherein the fixed base is made of a material with elasticity and flexibility, preferably a silicone material. In addition, in order to hold and fix the reagent bottle assembly and the buffer bottle assembly on the fixed base, a circular groove with a depth of not less than 5 cm is provided on the fixed base to closely fit the bottom of the reagent bottle and the buffer bottle.

[0051] It is understandable that the first reagent bottle assembly 10, the second reagent bottle assembly 30, the buffer bottle assembly 20 and the related gas circuits can be made of glass, corrosion-resistant stainless steel or polytetrafluoroethylene. Considering the convenience and operability of practical applications, polytetrafluoroethylene is preferred.

[0052] In order to facilitate pipeline connection, the upper parts of the first reagent bottle 10a, the second reagent bottle 30a and the buffer bottle 20a should be at the same level.

[0053] Preferably, the reagent bottle cap and the buffer bottle cap 20b are connected to each gas circuit via a quick-insert connector.

[0054] The first air inlet branch Gs1 passes through the acrylic glove box 40 to connect to the nitrogen source, and the third connecting air path C3 passes through the acrylic glove box 40 to connect to the detection unit. It can be understood that a good seal is provided at the position where the air path passes through the acrylic glove box 40 to prevent the diffusion of the synthesized radioactive elemental iodine.

[0055] The dilution unit includes a second air intake branch Gs2, one end of which is connected to a nitrogen source, and the other end of which is joined to a third connecting air path C3 outside the acrylic glove box 40. It is understandable that a check valve is provided on the second air intake branch Gs2 to prevent the synthesized radioactive gas from flowing back into the second air intake branch Gs2 due to the imbalance of gas pressure in the system pipeline. Since the dilution unit is only used as a dilution gas supply after synthesizing radioactive elemental iodine, its main component is nitrogen, and therefore it does not need to be placed in the acrylic glove box 40.

[0056] Preferably, a mass flow meter is provided in both the first air intake branch Gs1 and the second air intake branch Gs2, and the mass flow meter is configured to control and adjust the flow rate of the fluid passing through the mass flow meter so that the concentration of the synthesized radioactive elemental iodine meets the set requirements.

[0057] The detection unit includes a temperature sensor 50 and a pressure sensor 60, which are arranged in sequence on the merged air path formed after the second air intake branch Gs2 merges with the third connecting air path C3. The temperature sensor 50 and the pressure sensor 60 should be installed as close as possible and close to the iodine adsorption test unit to accurately monitor the temperature and pressure of the airflow in front of the iodine adsorption test unit.

[0058] The iodine adsorption test unit includes a test bed 70 and a backup bed 80. The test bed 70 and the backup bed 80 are installed outside the acrylic glove box 40. The test bed 70 is filled with an iodine removal adsorbent, which may be activated carbon or other adsorption materials. The depth of the test bed 70 is not less than 25 mm. The backup bed 80 is filled with nuclear-grade activated carbon with qualified iodine removal efficiency, and the depth of the backup bed 80 is not less than 50 mm.

[0059] It should be noted that the temperature sensor 50, the pressure sensor 60, the test bed 70 and the backup bed 80 are placed in a constant temperature box. Figure 1 The dotted line in the figure represents the incubator.

[0060] A check valve is also installed on the gas path behind the spare bed 80 to prevent the backflow of gas caused by the imbalance of gas pressure in the system pipeline.

[0061] The present invention controls and adjusts the nitrogen flow rate to flow a nitrogen flow carrying elemental iodine into a potassium iodide elemental iodine saturated solution containing radioactive sodium iodide. Since the elemental iodine in the potassium iodide elemental iodine saturated solution is in a saturated state, the iodine-carrying nitrogen flow does not dissolve after entering the solution, but undergoes an isotope exchange reaction with the radioactive sodium iodide in the solution to produce radioactive elemental iodine and flows out with the carrier gas, that is, synthesizing radioactive elemental iodine. Then, the elemental iodine flow is diluted under the action of a dilution gas flow so that the concentration of the generated elemental iodine meets the requirements specified in the standard. Finally, an adsorbent is fed so that the adsorbent adsorbs the radioactive elemental iodine. The standard requirements are, for example, that the elemental iodine concentration required in ASTM D3803-79 is 75±5 mg / m3.

[0062] The present invention also provides a method for synthesizing and feeding radioactive elemental iodine using the above-mentioned radioactive elemental iodine synthesis and feeding system, wherein the method steps are as follows: Figure 3 As shown, specifically including,

[0063] Step S100: Add elemental iodine into the first reagent bottle, add a saturated solution of elemental iodine of potassium iodide into the second reagent bottle, and tighten the bottle caps.

[0064] Step S200: Turn on the vacuum pump to ensure that the acrylic glove box is under a slight negative pressure, add the radioactive iodine compound into the second reagent bottle containing the saturated solution of elemental iodine of potassium iodide through a syringe, and quickly tighten the bottle cap. The radioactive iodine compound is preferably radioactive sodium iodide.

[0065] Step S300: Nitrogen is supplied to the first air inlet branch and the second air inlet branch respectively through the mass flow meter at a set flow rate, and the radioactive elemental iodine gas stream synthesized by the system is diluted by the nitrogen in the dilution unit and sent to the test bed for adsorbent capture to complete the feeding. Among them, after entering the first air inlet branch, the nitrogen gas stream passes through the first reagent bottle assembly, the buffer bottle assembly and the second reagent bottle assembly in sequence to promote the synthesis reaction of radioactive elemental iodine.

[0066] The present invention designs and installs pipelines and containers required for radioactive elemental iodine synthesis in an acrylic glove box, and uses anti-corrosion quick plug-ins to connect the containers with the pipelines; a test bed and a backup bed are connected outside the acrylic glove box, and the airflow temperature and pressure in the system pipeline in front of the test bed are monitored by a temperature sensor and a pressure sensor; a buffer bottle assembly and an anti-corrosion check valve are arranged on the system pipeline, which can effectively prevent and avoid airflow entry and liquid backflow caused by unbalanced gas pressure in the system pipeline.

[0067] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A synthesis and feeding system for radioactive elemental iodine, characterized in that: Including radioactive elemental iodine synthesis unit, dilution unit, detection unit and iodine adsorption test unit; The radioactive elemental iodine synthesis unit is used to synthesize radioactive elemental iodine; The dilution unit is used to provide dilution gas for the synthesized radioactive elemental iodine, and dilute the radioactive elemental iodine synthesized by the radioactive elemental iodine synthesis unit; The detection unit is arranged before the iodine adsorption test unit and is used to detect parameters of the test airflow entering the iodine adsorption test unit, wherein the parameters include the temperature and pressure of the airflow; The iodine adsorption test unit is used to adsorb the test airflow containing radioactive elemental iodine to perform an iodine adsorption test; The radioactive elemental iodine synthesis unit comprises a first air inlet branch, a first reagent bottle assembly, a first connecting air path, a buffer bottle assembly, a second connecting air path, a second reagent bottle assembly, a third connecting air path, and an acrylic glove box connected in sequence. The first reagent bottle assembly is used to contain elemental iodine, and the second reagent bottle assembly is used to contain a saturated elemental iodine solution of potassium iodide containing radioactive sodium iodide. The acrylic glove box is respectively attached with a vacuum gauge and a vacuum pump.

2. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: The first reagent bottle assembly includes a first reagent bottle and a first reagent bottle cap, the air inlet of the first reagent bottle assembly is close to the bottom of the first reagent bottle, and the air outlet of the first reagent bottle assembly is flush with the inner surface of the first reagent bottle cap.

3. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: The second reagent bottle assembly includes a second reagent bottle and a second reagent bottle cap, the air inlet of the second reagent bottle assembly is close to the bottom of the second reagent bottle and below the liquid level of the solution therein, and the air outlet of the second reagent bottle assembly is flush with the inner surface of the second reagent bottle cap.

4. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: The buffer bottle assembly comprises a buffer bottle and a buffer bottle cap, the air inlet of the buffer bottle assembly is flush with the inner surface of the buffer bottle cap, and the air outlet of the buffer bottle assembly is located lower than the air inlet.

5. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: Mass flow meters are provided on both the first air intake branch and the second air intake branch, and the mass flow meters are configured to control and adjust the flow rate of the fluid passing through the mass flow meters so that the concentration of the synthesized radioactive elemental iodine meets the set requirements.

6. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: Check valves are installed on the second connecting air path and the second air intake branch path respectively.

7. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: The first reagent bottle assembly, the second reagent bottle assembly, the buffer bottle assembly and related gas circuits are made of polytetrafluoroethylene.

8. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: The first reagent bottle assembly, the buffer bottle assembly, and the second reagent bottle assembly are installed in the acrylic glove box through a fixed base, wherein the fixed base is made of silicone material and is provided with a circular groove with a depth of not less than 5 cm.

9. The synthesis and feeding system of radioactive elemental iodine according to claim 1, characterized in that: The iodine adsorption test unit comprises a test bed and a reserve bed. The test bed is filled with an iodine removal adsorbent, and the depth of the test bed is not less than 25 mm. The reserve bed is filled with nuclear-grade activated carbon with qualified iodine removal efficiency, and the depth of the reserve bed is not less than 50 mm.

10. A method for synthesizing and feeding radioactive elemental iodine using the synthesis and feeding system for radioactive elemental iodine according to any one of claims 1 to 9, comprising the following steps: Add elemental iodine to the first reagent bottle, add a saturated solution of elemental iodine of potassium iodide to the second reagent bottle, and tighten the bottle caps; Turn on the vacuum pump to ensure that the acrylic glove box is under a slight negative pressure condition, add the radioactive iodine compound into the second reagent bottle containing the saturated solution of elemental iodine of potassium iodide through a syringe and quickly tighten the bottle cap; Nitrogen is supplied to the first air inlet branch and the second air inlet branch respectively through a mass flow meter at a set flow rate. The radioactive elemental iodine-containing gas flow synthesized by the system is diluted by the nitrogen in the dilution unit and sent to the test bed for adsorbent capture to complete the feeding. Among them, after entering the first air inlet branch, the nitrogen flow passes through the first reagent bottle assembly, the buffer bottle assembly and the second reagent bottle assembly in sequence to promote the synthesis reaction of radioactive elemental iodine.

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