Preparation method of radioactive hypoiodic acid

Abstract

The invention provides a preparation method of radioactive hypoiodic acid. The preparation method comprises the following steps: preparation of a stand-by iodine source solution: diluting a radioactive iodine source containing radioactive iodide ions with a solution containing a radioactive iodine source stable compound, and packaging the diluted radioactive iodine source into an iodine source bottle to obtain the stand-by iodine source solution; the method comprises the following steps: sequentially adding a sodium hypochlorite solution and a standby iodine source solution into a tetraboric acid buffer solution in a reactor, reacting to generate liquid-state secondary iodic acid, introducing air into the bottom of the liquid-state secondary iodic acid, and enabling the liquid-state secondary iodic acid to generate bubbles so as to form elemental iodine and gaseous radioactive secondary iodic acid; the gaseous radioactive sub-iodic acid passes through the front bed to remove elemental iodine impurities, and then is collected through the test bed to obtain the radioactive sub-iodic acid. The reagent adopted by the invention is a sodium hypochlorite solution, so that the use of highly toxic mercury oxide is avoided, the step of precipitation and filtration is not needed in the reaction process, and high-temperature reaction conditions are not needed. The preparation method has the advantages of being simple in reaction condition, rapid in reaction and non-toxic in reagent.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear facility gas purification, and in particular to a method for preparing radioactive hypoiodous acid. Background Art

[0002] Radioactive waste gas 131 I has always been the focus of people's attention due to its high radioactivity, large amount of production and potential harm. 131 I exists in aerosol, inorganic, elemental, and organic forms. Research on inorganic iodides in nuclear waste gas emissions has focused on I2, while research on organic iodides has focused on CH3I. However, limited research has been conducted on organic iodides. Based on literature research and thermodynamic modeling, HOI has been identified as a form of iodine present in nuclear waste gas systems.

[0003] Hypoiodous acid (HOI) is considered a form of iodine that is difficult to capture with conventional adsorption media. To prevent the harmful effects of radioactive hypoiodous acid efflux, adsorbent materials with the ability to retain HOI are needed. To evaluate the retention performance of adsorbent materials for HOI, safe and stable methods for preparing radioactive hypoiodous acid are needed.

[0004] Gaseous hypoiodous acid is currently produced by the following reaction:

[0005]

[0006] During the reaction, the key reactant, mercury oxide (HgO), has extremely high biological and environmental toxicity, greatly increasing the health and environmental risks during experiments or production. The above reactions not only generate the target product, gaseous HOI, but also produce solid by-products or other gaseous substances. The separation of by-products dramatically increases the radioactive hazard of the entire process. Pathways such as the iron-iodine reaction often require high temperature conditions and complex operations; the mercury-iodine reaction is sensitive to parameters such as temperature, and strict control of conditions is required.

[0007] Therefore, the existing technology has defects such as high toxicity of reactants, harsh reaction conditions, and complex preparation process. The traditional hypoiodous acid generation method uses mercury oxide and elemental iodine to react to produce hypoiodous acid, which has the defects of high toxicity of reactants, harsh reaction conditions, and complex preparation process, thereby posing a high risk of radioactivity.

[0008] The above problems need to be solved urgently. Summary of the Invention

[0009] The invention discloses a preparation method of radioactive hypoiodous acid, aiming to solve the technical problems existing in the prior art.

[0010] The present invention adopts the following technical solutions:

[0011] The present invention provides a method for preparing radioactive hypoiodous acid, comprising:

[0012] The radioactive iodine source containing radioactive iodine ions is diluted with a solution containing a radioactive iodine source stabilizing compound and then encapsulated into an iodine source bottle to obtain an iodine source solution to be used;

[0013] In a reactor, sodium hypochlorite solution and iodine source solution to be used are sequentially added to a tetraborate buffer solution to react and generate liquid hypoiodous acid. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous radioactive hypoiodous acid. After the elemental iodine impurities are removed by a pre-bed, the radioactive hypoiodous acid is collected through a test bed.

[0014] In one possible implementation, the chemical reaction formula is: NaOCl+NaI+H2O→HOI+NaCl+NaOH.

[0015] In a possible implementation, the volume ratio of the iodine source solution to be used, the sodium hypochlorite solution, and the tetraborate buffer solution is 1:(1-2):(100-200).

[0016] In a possible implementation, the volume ratio of the to-be-used iodine source solution, the sodium hypochlorite solution, and the tetraborate buffer solution is 1:1:100.

[0017] In a possible implementation, the reaction temperature is 20°C to 30°C.

[0018] In a possible implementation, the reaction pH is 7-9.

[0019] In a possible implementation, the activity of the iodine source solution to be used is 5 MBq to 300 MBq.

[0020] In a possible implementation, the radioactive iodine source includes a radioactive sodium iodide solution or a radioactive potassium iodide solution; and / or, the radioactive iodine source stable compound includes a non-radioactive sodium iodide solution or a non-radioactive potassium iodide solution.

[0021] In a possible implementation, the front bed is activated alumina impregnated with cadmium iodide, which is used to capture elemental iodine produced by the reaction.

[0022] In a possible implementation, an adsorption medium is placed in the test bed, and the adsorption medium is activated carbon or molecular sieve; the test bed is used to adsorb hypoiodous acid generated by the reaction.

[0023] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0024] The present invention primarily provides a method for preparing radioactive hypoiodous acid, comprising: preparing a ready-to-use iodine source solution; diluting a radioiodine source containing radioactive iodine ions with a solution containing a radioactive iodine source-stabilizing compound, and encapsulating the solution in an iodine source bottle to obtain the ready-to-use iodine source solution; sequentially adding a sodium hypochlorite solution and the ready-to-use iodine source solution to a tetraborate buffer in a reactor to react and generate liquid hypoiodous acid; introducing air into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous radioactive hypoiodous acid; removing elemental iodine impurities in a pre-bed, and collecting the gaseous radioactive hypoiodous acid in a test bed. The present invention utilizes a sodium hypochlorite solution as the reagent, thereby avoiding the use of highly toxic mercuric oxide. The reaction process does not require precipitation or filtration, and high-temperature reaction conditions are not required. This preparation method has the advantages of simple reaction conditions, rapid reaction, and non-toxic reagents. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be combined with the specific embodiments of the present invention and the corresponding technical solutions of the present invention to clearly and completely describe them. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0026] Example 1

[0027] Preparation of iodine source solution to be used:

[0028] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 I)) has an initial activity of 38.13 MBq and an initial volume of 0.5 ml. Since the activity decays over time, the decay formula is used to correct NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 9 days, after correction using the decay formula, the source activity on that day is 17.56MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131I)) dilute with 3.0 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0029] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0030] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0031] Example 2

[0032] Preparation of iodine source solution to be used:

[0033] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 34.86 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131I half-life 8.02 days); t is the storage time before dilution is 10 days, after correction using the decay formula, the source activity on that day is 14.72MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 2.4 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0034] The prepared iodine source solution to be used is operated in a glove box to sequentially add sodium hypochlorite solution (0.1 mol / L) and iodine source solution to be used to tetraborate buffer solution, and react in a reactor. The pH of the tetraborate buffer solution is 8, the volume ratio of the iodine source solution to be used, sodium hypochlorite solution and tetraborate buffer solution is 1:1:100, the reaction temperature is 20°C, the reaction time is 7 minutes, and the reaction produces liquid hypoiodous acid. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gas. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0035] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0036] Example 3

[0037] Preparation of iodine source solution to be used:

[0038] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131I)) has an initial activity of 31.98 MBq and an initial volume of 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 9 days, after correction using the decay formula, the source activity on that day is 14.72MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 2.4 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0039] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 20°C and the reaction time is 10 min. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0040] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0041] Example 4

[0042] Preparation of iodine source solution to be used:

[0043] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 29.64 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 8 days, after correction using the decay formula, the source activity on that day is 14.72MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 2.4 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0044] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 25°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0045] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0046] Example 5

[0047] Preparation of iodine source solution to be used:

[0048] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 26.62 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 7 days, after correction using the decay formula, the source activity on that day is 14.72MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 2.4 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0049] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 30°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0050] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0051] Example 6

[0052] Preparation of iodine source solution to be used:

[0053] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 24.69 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 10 days, after correction using the decay formula, the source activity on that day is 10.54MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131I)) dilute with 1.6 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0054] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:50. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. Radioactive hypoiodous acid is then impregnated with activated alumina using cadmium iodide in the pre-bed, and the low physical adsorption characteristics of activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to fully adsorb, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0055] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0056] Example 7

[0057] Preparation of iodine source solution to be used:

[0058] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 22.65 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131I half-life 8.02 days); t is the storage time before dilution is 10 days, after correction using the decay formula, the source activity on that day is 9.57MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 1.4 ml of a 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it in an iodine source bottle for testing. At this time, the iodine source activity is 5 MBq, the activity used in a single test.

[0059] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:2:100. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0060] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity of hypoiodous acid in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0061] Example 8

[0062] Preparation of iodine source solution to be used:

[0063] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131The initial activity of NaI is 20.78 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 10 days, after correction using the decay formula, the source activity on that day is 8.78MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) dilute with 1.2 ml of a 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it in an iodine source bottle for testing. At this time, the iodine source activity is 5 MBq, the activity used in a single test.

[0064] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:150. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0065] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0066] Example 9

[0067] Preparation of iodine source solution to be used:

[0068] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 19.07 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 2 days, after correction using the decay formula, the source activity on that day is 16.05MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 2.7 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0069] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:200. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0070] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0071] Example 10

[0072] Preparation of iodine source solution to be used:

[0073] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 105.59 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 5 days, after correction using the decay formula, the source activity on that day is 68.62MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) dilute with 0.87 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 50 MBq, which is the activity used in a single experiment.

[0074] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 2:2:200. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0075] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity in the sampling boxes to the activity of the initial source used in the test.

[0076] Example 11

[0077] Preparation of iodine source solution to be used:

[0078] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 460.8 MBq and the initial volume is 0.7 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 1 day, after correction using the decay formula, the source activity on that day is 422.74MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131I)) dilute with 0.7 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the test. At this time, the iodine source activity is 300 MBq, the activity used for a single test.

[0079] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 2:2:200. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0080] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0081] Example 12

[0082] Preparation of iodine source solution to be used:

[0083] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 The initial activity of NaI is 18.05 MBq and the initial volume is 0.4 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131I half-life 8.02 days); t is the storage time before dilution is 5 days, after correction using the decay formula, the source activity on that day is 11.73MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 1.95 ml of a 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it in an iodine source bottle for testing. At this time, the iodine source activity is 5 MBq, the activity used for a single test.

[0084] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 8. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0085] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0086] Example 13

[0087] Preparation of iodine source solution to be used:

[0088] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131The initial activity of NaI is 16.55 MBq and the initial volume is 0.5 ml. Since the activity decays over time, the decay formula is used to correct the NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 2 days, after correction using the decay formula, the source activity on that day is 14.72MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I)) Dilute with 2.4 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and encapsulate it into an iodine source bottle for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used in a single experiment.

[0089] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 7. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0090] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0091] Example 14

[0092] Preparation of iodine source solution to be used:

[0093] In a protective radioactive operation glove box, 5 g of sodium iodide solid (purity 99%) was dissolved in 250 ml of deionized water to obtain a non-radioactive sodium iodide solution with a concentration of 0.1 mol / L. The radioactive iodine ion source (NaI( 131 I)) has an initial activity of 15.19 MBq and an initial volume of 0.4 ml. Since the activity decays over time, the decay formula is used to correct NaI( 131 I) Activity: A(t) = A0·e -λt ,in, (decay constant, T 1 / 2 for 131 I half-life 8.02 days); t is the storage time before dilution is 4 days, after correction using the decay formula, the source activity on that day is 10.76MBq; then according to the formula Calculate the activity of the test source, V0 is the initial volume, V1 is the volume after dilution with non-radioactive sodium iodide solution, and V2 is the volume extracted from the mixed solution. 131 I) Dilute with 1.75 ml of 0.1 mol / L non-radioactive sodium iodide solution; extract 1 ml from the buffer solution and seal it into the iodine source bottle used for the experiment. At this time, the iodine source activity is 5 MBq, which is the activity used for a single experiment.

[0094] The prepared iodine source solution to be used is operated in a glove box. Sodium hypochlorite solution (0.1 mol / L) and the iodine source solution to be used are sequentially added to the tetraborate buffer solution. The pH of the tetraborate buffer solution is 9. The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:100. The reaction temperature is 20°C and the reaction time is 5 minutes. Liquid hypoiodous acid is produced by the reaction. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous iodine. The radioactive hypoiodous acid is then impregnated with cadmium iodide in the pre-bed, and the low physical adsorption characteristics of the activated alumina are used to reduce the retention of hypoiodous acid. The elemental iodine impurities produced by the selective adsorption reaction of cadmium iodide are removed, and the gaseous hypoiodous acid is collected in the test bed. In order to ensure sufficient adsorption, the test bed includes a first-level test bed and a second-level test bed. Activated carbon adsorption media are placed in both the first-level test bed and the second-level test bed. The activated carbon adsorption media is placed in the sampling box, and the gaseous hypoiodous acid is adsorbed by the activated carbon adsorption media.

[0095] After a certain period of injection and sampling of radioactive hypoiodous acid, the test apparatus was shut down and dismantled. The radioactive activity in the sampling boxes in the primary and secondary test beds was measured using a gamma spectrometer (Maestro-32). The yield of gaseous radioactive hypoiodous acid was determined based on the ratio of the measured radioactive activity of the hypoiodous acid in the sampling boxes to the activity of the initial source used in the test.

[0096] Table 1 Experimental data of Examples 1-14

[0097]

[0098]

[0099] As shown in Table 1, the generation efficiency of airborne radioactive hypoiodous acid (HOI) is significantly affected by the volume ratio of the reaction system, temperature, reaction time and buffer pH value:

[0100] (1) Solution volume ratio: When the sodium hypochlorite solution is excessive (volume ratio of 1:2:100), the excess hypochlorite will further oxidize I- / HOI, resulting in a decrease in the production of the target product HOI. When the sodium hypochlorite solution is insufficient (volume ratio of 1:1:50), the reactant concentration doubles, and the side reaction rate increases quadratically, causing the HOI yield to drop significantly from 69.56% to 20.53%. Therefore, 1:1:100 is the optimal solution volume ratio, with a hypoiodous acid yield of over 70%.

[0101] (2) Reaction temperature and time: As the reaction system temperature increased, the HOI yield increased slightly without inducing significant side reactions. This improvement may be due to enhanced reaction kinetics or increased HOI saturated vapor pressure, which promoted the escape of gaseous products. Given that elevated temperature increases the risk of radioactivity, room temperature conditions can meet the requirements for HOI generation. The HOI yield increased slightly when the reaction time was extended from 5 min to 7 min, but stabilized after being extended to 10 min, indicating that the reaction was essentially completed within 10 min.

[0102] (3) Buffer pH: HOI has a pKa of 10.4, so at pH 8, the calculated proportion of HOI exceeds 95%, and the weakly alkaline environment effectively inhibits the formation of I2. When the pH rises to 10, the calculated proportion of HOI drops to about 71%. At pH 7, sodium hypochlorite (pKa ≈ 7.5) exists mainly in the form of hypochlorous acid (HOCl). HOCl is a chlorine ion (OCl) that is smaller than the hypochlorite ion. - ) Stronger oxidants tend to - Direct oxidation to iodate (IO3 - ). Therefore, pH 8 was determined to be the most suitable buffer pH value.

[0103] (4) Iodine source concentration: Experimental results show that the iodine source concentration has no significant effect on HOI yield.

[0104] This shows that when sodium hypochlorite solution is used as the core reagent to prepare radioactive hypoiodous acid, the highly toxic mercuric oxide (HgO) used in existing technologies is completely discarded, fundamentally eliminating the risk of mercury pollution and the related stringent protection requirements. It is highly safe and avoids the use of highly toxic substances:

[0105] In a reactor, a sodium hypochlorite solution and an iodine source solution to be used are sequentially added to a tetraborate buffer solution to react and generate liquid hypoiodous acid. Air is introduced into the bottom of the liquid hypoiodous acid to form elemental iodine and gaseous radioactive hypoiodous acid. The reaction is completed in a single step in the liquid phase, eliminating the complex solid-liquid separation steps such as precipitation and filtration required by existing methods due to the generation of solid byproducts (such as Hg and FeI3), thereby simplifying the operation process.

[0106] The reaction can be carried out quickly (5-10 minutes) at room temperature (20-30°C), without the need for high temperature conditions required by existing iron-iodine methods. It is easy to operate, has low energy consumption, good reproducibility, and mild and controllable reaction conditions.

[0107] This method combines simple reaction conditions, convenient operation, low reagent toxicity, and high safety, providing a reliable technical approach for the safe, stable, and efficient preparation of radioactive hypoiodous acid (HOI). It is particularly suitable for the urgent need for radioactive HOI preparation sources in the research and development of nuclear facility waste gas treatment materials.

[0108] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A method for preparing radioactive hypoiodous acid, characterized in that: include: The radioactive iodine source containing radioactive iodine ions is diluted with a solution containing a radioactive iodine source stabilizing compound and then encapsulated into an iodine source bottle to obtain an iodine source solution to be used; In a reactor, sodium hypochlorite solution and iodine source solution to be used are sequentially added to a tetraborate buffer solution to react and generate liquid hypoiodous acid. Air is introduced into the bottom of the liquid hypoiodous acid to generate bubbles in the liquid hypoiodous acid, thereby forming elemental iodine and gaseous radioactive hypoiodous acid. After the elemental iodine impurities are removed by a pre-bed, the radioactive hypoiodous acid is collected through a test bed.

2. The preparation method according to claim 1, wherein: The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:(1-2):(100-200).

3. The preparation method according to claim 2, wherein: The volume ratio of the iodine source solution to be used, the sodium hypochlorite solution and the tetraborate buffer solution is 1:1:

100.

4. The preparation method according to claim 1, wherein: The reaction temperature is 20°C to 30°C.

5. The preparation method according to claim 1, wherein: The reaction time is 5 to 10 minutes.

6. The preparation method according to claim 1, wherein: The reaction pH is 7-9.

7. The preparation method according to claim 1, wherein: The activity of the iodine source solution to be used is 5MBq to 300MBq.

8. The preparation method according to claim 1, wherein: The radioactive iodine source includes a radioactive sodium iodide solution or a radioactive potassium iodide solution; and / or, the radioactive iodine source stable compound includes a non-radioactive sodium iodide solution and a non-radioactive potassium iodide solution.

9. The preparation method according to claim 1, wherein: The front bed is activated alumina impregnated with cadmium iodide, and is used to capture elemental iodine produced by the reaction.

10. The preparation method according to claim 1, characterized in that: An adsorption medium is placed in the test bed, and the adsorption medium is activated carbon or molecular sieve; the test bed is used to adsorb hypoiodous acid generated by the reaction.

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