A method for rapid analysis of radionuclides based on plastic scintillation resin

Abstract

The present invention relates to the field of radionuclide measurement, and in particular to a method and use of rapid analysis of radionuclides based on plastic scintillation resin. The method comprises the following steps: Step 1, column loading: selecting corresponding plastic scintillation resin for the radioactive solution to be separated, and filling the resin material into a multifunctional liquid scintillation bottle; Step 2, separation: connecting the chromatographic column to the automatic separation system, and controlling the column pressure and flow rate by a microcomputer; Step 3, drawing a standard curve: the standard curve is generated by a series of radionuclide solutions with gradient concentrations; Step 4, liquid scintillation measurement: placing the chromatographic column obtained in step 2 in a liquid scintillation instrument, continuously measuring and counting, and calculating the concentration or content of the radionuclide in the sample to be tested from the standard curve obtained in step 3. The method is simple, the detection is fast, and it is easy to store. Compared with liquid scintillation, the material also has the advantages of not generating additional radioactive waste liquid and being reusable.

Description

Technical Field

[0001] The invention relates to the field of radionuclide measurement, and in particular to a method and application of rapid radionuclide analysis based on plastic scintillation resin. Background Art

[0002] Liquid scintillation measurement is one of the commonly used and very effective methods for β-type nuclide analysis, but it has the following disadvantages: First, the traditional liquid scintillation measurement technology first needs to separate the nuclide to be measured from the matrix, which involves a relatively long process and operation steps; Second, the separated nuclide solution needs to be transferred to the currently existing measuring bottle, which has the problem of secondary contamination of the nuclide. At the same time, there may be incomplete transfer, which affects the accuracy of the final measurement, especially in trace and ultra-trace analysis. This process will have a relatively large impact on the measurement results; Third, organic scintillation liquid needs to be prepared in the traditional liquid scintillation measurement process. After the measurement is completed, a large amount of radioactive organic waste liquid is generated. This is also one of the main sources of radioactive organic waste liquid at present. It is difficult to handle and has the disadvantages of high technical barriers and high costs, which greatly limits the widespread application of liquid scintillation measurement technology. Summary of the invention

[0003] Purpose of the invention: To provide a better method and use for rapid analysis of radionuclides based on plastic scintillation resin. For specific purposes, see the multiple substantial technical effects in the specific implementation section.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] Scheme 1: Use of styrene and divinylbenzene as matrix and 2,5-diphenyloxazole and 1,4-bis[2-(5-phenyl)oxazolyl]benzene as scintillators in rapid analysis of radionuclides.

[0006] Option 2:

[0007] A method for rapid analysis of radionuclides based on plastic scintillation resin, characterized in that it comprises the following steps:

[0008] Step 1, column loading: select corresponding plastic scintillation resin for the radioactive solution to be separated, and fill the resin material into a multifunctional liquid scintillation bottle; the plastic scintillation resin composition is styrene and divinylbenzene as a matrix, 2,5-diphenyloxazole and 1,4-bis[2-(5-phenyl)oxazolyl]benzene as scintillants; the mass ratio of styrene and divinylbenzene as a matrix is ​​between 3:1 and 1:3, 2,5-diphenyloxazole accounts for 0.50%-3.00% of the total mass of styrene and divinylbenzene; 1,4-bis[2-(5-phenyl)oxazolyl accounts for 0.01%-0.03% of the total mass of styrene and divinylbenzene; the plastic scintillation resin is a chromatographic column;

[0009] Step 2, separation: connect the chromatographic column to the automatic separation system, and control the column pressure and flow rate through a microcomputer; after the chromatographic column is fully enriched with radionuclides, close the upper cover and the lower bottom, and the remaining solution in the column is the fixed volume of the device as a determined value, and take out the chromatographic column to obtain the sample to be tested;

[0010] Step 3: Drawing a standard curve: prepare a radionuclide solution with gradient concentrations in a chromatographic column, add the same amount of plastic scintillation resin, shake well, and after the plastic scintillation resin fully adsorbs the radionuclide, place the chromatographic column in a liquid scintillation instrument to obtain a standard curve; the standard curve is generated by a series of radionuclide solutions with gradient concentrations;

[0011] Step 4: Liquid scintillation measurement: Place the chromatographic column obtained in step 2 in a liquid scintillation instrument, measure and count continuously, and calculate the concentration or content of the radionuclide in the sample to be tested based on the standard curve obtained in step 3.

[0012] A further technical solution of the present invention is that step 2 further comprises the following steps, and a continuous separation process can be achieved by replacing a new chromatographic column and a solution to be tested.

[0013] A further technical solution of the present invention is that it also includes step five, resin regeneration: the chromatographic column after measurement is reconnected to the flow injection pump, the eluent is replaced, and regeneration is performed; the solution flowing out from the lower end is an inorganic radioactive waste liquid with a known concentration, which is centrally processed, and the eluted scintillation resin can be reused after drying.

[0014] The present invention adopting the above technical solution has the following beneficial effects compared with the prior art: by using styrene and divinylbenzene as the matrix, 2,5-diphenyloxazole (PPO) and 1,4-bis[2-(5-phenyl)oxazolyl]benzene (POPOP) as scintillators, corresponding functional groups are grafted to different radioactive nuclides to achieve enrichment and separation functions, and scintillation resin is formed after high polymerization. The application of this material in liquid scintillation measurement has the following advantages: simple use method, fast detection, easy storage, etc., and compared with liquid scintillation, the material also has the advantages of not generating additional radioactive waste liquid and being reusable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to further illustrate the present invention, the following is further described in conjunction with the accompanying drawings:

[0016] Figure 1 It is a specific flow chart of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0018] Embodiment 1: Combination Figure 1 ; Scheme 1: Use of styrene and divinylbenzene as matrix, 2,5-diphenyloxazole and 1,4-bis[2-(5-phenyl)oxazolyl]benzene as scintillators in rapid analysis of radionuclides. The substantial technical effect of the technical scheme herein and its implementation process and further preferred embodiment are as follows: A method for rapid analysis of radionuclides based on plastic scintillating resin, characterized in that it comprises the following steps:

[0019] Step 1, column loading: select corresponding plastic scintillation resin for the radioactive solution to be separated, and fill the resin material into a multifunctional liquid scintillation bottle; the plastic scintillation resin composition is styrene and divinylbenzene as a matrix, 2,5-diphenyloxazole and 1,4-bis[2-(5-phenyl)oxazolyl]benzene as scintillants; the mass ratio of styrene and divinylbenzene as a matrix is ​​between 3:1 and 1:3, 2,5-diphenyloxazole accounts for 0.50%-3.00% of the total mass of styrene and divinylbenzene; 1,4-bis[2-(5-phenyl)oxazolyl accounts for 0.01%-0.03% of the total mass of styrene and divinylbenzene; the plastic scintillation resin is a chromatographic column;

[0020] Step 2, separation: connect the chromatographic column to the automatic separation system, and control the column pressure and flow rate through a microcomputer; after the chromatographic column is fully enriched with radionuclides, close the upper cover and the lower bottom, and the remaining solution in the column is the fixed volume of the device as a determined value, and take out the chromatographic column to obtain the sample to be tested;

[0021] Step 3: Drawing a standard curve: prepare a radionuclide solution with gradient concentrations in a chromatographic column, add the same amount of plastic scintillation resin, shake well, and after the plastic scintillation resin fully adsorbs the radionuclide, place the chromatographic column in a liquid scintillation instrument to obtain a standard curve; the standard curve is generated by a series of radionuclide solutions with gradient concentrations;

[0022] Step 4: Liquid scintillation measurement: Place the chromatographic column obtained in step 2 in a liquid scintillation instrument, measure and count continuously, and calculate the concentration or content of the radionuclide in the sample to be tested based on the standard curve obtained in step 3.

[0023] Embodiment 2: As a further improved solution or parallel solution or optional independent solution, step 2 also includes the following steps, by replacing a new chromatographic column and a test solution, a continuous separation process can be achieved. The substantial technical effect of the technical solution here and its implementation process and further preferred are as follows: continuous separation can be separated more efficiently.

[0024] Embodiment 3: As a further improved scheme or parallel scheme or optional independent scheme, it also includes step 5, resin regeneration: reconnecting the chromatographic column after measurement to the flow injection pump, replacing the eluent, and regenerating; the solution flowing out of the lower end is an inorganic radioactive waste liquid of known concentration, which is centrally processed, and the eluted scintillation resin can be reused after drying. The substantial technical effect of the technical scheme here and its implementation process and further preferred are as follows: Reuse can make full use of materials and realize continuous measurement.

[0025] Based on the characteristics of scintillation resin, this patent proposes a new rapid analysis process for radionuclides to improve the shortcomings of liquid scintillation and is used in research in the fields of nuclear chemistry, environmental radiochemistry, and radioanalysis.

[0026] Innovatively, each of the above effects exists independently, and a set of structures can be used to combine the above results.

[0027] It should be noted that the multiple solutions provided by this patent include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0028] The basic principle, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the protection required.

Claims

1. Rapid analysis of radionuclides based on plastic scintillation resins, It is characterized in that The following steps are included: Step 1, column loading: select corresponding plastic scintillation resin for the radioactive solution to be separated, and fill the resin material into a multifunctional liquid scintillation bottle; the plastic scintillation resin composition is styrene and divinylbenzene as a matrix, 2,5-diphenyloxazole and 1,4-bis[2-(5-phenyl)oxazolyl]benzene as scintillants; the mass ratio of styrene and divinylbenzene as a matrix is ​​between 3:1 and 1:3, 2,5-diphenyloxazole accounts for 0.50%-3.00% of the total mass of styrene and divinylbenzene; 1,4-bis[2-(5-phenyl)oxazolyl accounts for 0.01%-0.03% of the total mass of styrene and divinylbenzene; the plastic scintillation resin is a chromatographic column; Step 2, separation: connect the chromatographic column to the automatic separation system, and control the column pressure and flow rate through a microcomputer; after the chromatographic column is fully enriched with radionuclides, close the upper cover and the lower bottom, and the remaining solution in the column is the fixed volume of the device as a determined value, and take out the chromatographic column to obtain the sample to be tested; Step 3: Drawing a standard curve: prepare a radionuclide solution with gradient concentrations in a chromatographic column, add the same amount of plastic scintillation resin, shake well, and after the plastic scintillation resin fully adsorbs the radionuclide, place the chromatographic column in a liquid scintillation instrument to obtain a standard curve; the standard curve is generated by a series of radionuclide solutions with gradient concentrations; Step 4: Liquid scintillation measurement: Place the chromatographic column obtained in step 2 in a liquid scintillation instrument, measure and count continuously, and calculate the concentration or content of the radionuclide in the sample to be tested based on the standard curve obtained in step 3.

2. The method for rapid analysis of radionuclides based on plastic scintillation resin as claimed in claim 1, It is characterized in that Step 2 also includes the following steps: by replacing a new chromatographic column and a test solution, a continuous separation process can be achieved.

3. The method for rapid analysis of radionuclides based on plastic scintillation resin as claimed in claim 1, It is characterized in that The method also includes step five, resin regeneration: reconnecting the measured chromatographic column to the flow injection pump, replacing the eluent, and regenerating; the solution flowing out from the lower end is an inorganic radioactive waste liquid of known concentration, which is centrally processed, and the eluted scintillation resin can be reused after drying.

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