Method and system for calculating optimal irradiation time of reactor isotopes

Abstract

The application provides a calculation method and system for optimal irradiation time of a reactor isotope, and the method comprises the following steps: obtaining a reaction chain of a target for producing a target isotope during reactor irradiation; obtaining a calculation formula of a yield or specific activity of each isotope on the reaction chain changing with time; determining an optimal irradiation duration of the target isotope based on the calculation formula of the yield or specific activity of each isotope on the reaction chain changing with time; and accurately obtaining the optimal irradiation duration of the isotope, which lays a solid foundation for the optimal irradiation duration calculation of the reactor and provides a reference for the reactor irradiation time optimization of the isotope target.

Description

Technical Field

[0001] This application relates to the field of isotope generation technology, and in particular to a method and system for calculating the optimal time for reactor isotope irradiation. Background Technology

[0002] The production of isotopes is of great significance, impacting multiple fields including scientific research, medical diagnosis and treatment, industrial development, and national security. For example, stable isotopes such as carbon-13 and xenon-124 are used to label important molecules in living cells and biochemical reactions to understand their metabolism and biological processes; cesium-177 and iodine-125 are used to treat prostate cancer, lymphoma, and thyroid diseases; boron-11 is used as a dopant in semiconductor devices, effectively improving the radiation and interference resistance of electronic equipment; and some radioactive isotopes are used in nuclear weapons, nuclear power generation, radiation protection, and nuclear accident emergency response, forming an important part of national security and providing strong guarantees for national nuclear security. Isotope production also brings significant economic and social benefits, and its industry has become a new industry with broad market prospects and huge potential, not only promoting the development of related industrial chains but also driving employment and economic growth.

[0003] A reactor is a strong neutron source. By placing a suitable object containing relevant atomic nuclei (called the target material) into the reactor's active region, neutrons bombard the target material, causing nuclear reactions that produce radioactive isotopes. The object being bombarded is called the target, and the target material is called the target material. Commonly used nuclear reactions in reactors include (n, γ), (n, α), and (n, p) reactions, which can convert stable isotopes in the target material into radioactive isotopes.

[0004] The radioactive isotopes produced by reactor irradiation exhibit a cumulative yield over time, but also disappear due to decay or other nuclear reactions. The yield typically reaches saturation from zero, indicating an optimal irradiation time beyond which production essentially ceases to increase, making further irradiation within the reactor less meaningful. Due to variations in the half-life of radioactive isotopes, nuclear reaction cross-sections, and reactor neutron flux rates, the optimal irradiation time for each isotope varies significantly. Therefore, it is necessary to develop a method for calculating the optimal irradiation time for reactor isotopes and establish a system to accurately calculate the optimal irradiation time for various isotopes. This would provide a reference for efficient isotope irradiation production, guiding the process to maximize economic benefits. Summary of the Invention

[0005] This application aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, the first objective of this application is to propose a method for calculating the optimal time for reactor isotope irradiation, so as to accurately obtain the optimal duration of isotope irradiation and provide a reference for the efficient irradiation production of isotopes.

[0007] The second objective of this application is to propose a calculation system for the optimal time of reactor isotope irradiation.

[0008] The third objective of this application is to propose an electronic device.

[0009] The fourth objective of this application is to provide a computer-readable storage medium.

[0010] The fifth objective of this application is to provide a computer program product.

[0011] To achieve the above objectives, the first aspect of this application proposes a method for calculating the optimal time for reactor isotope irradiation, comprising:

[0012] Obtain the reaction chain of the target for producing the target isotope during reactor irradiation;

[0013] A calculation formula for obtaining the trend of yield or specific activity of each isotope in the reaction chain over time;

[0014] Based on the calculation formula of the change trend of the yield or specific activity of each isotope in the reaction chain over time, the optimal irradiation time of the target isotope is determined.

[0015] In some implementations, obtaining the determined reaction chain of the target for producing the target isotope during reactor irradiation includes:

[0016] Based on the nuclear reaction and / or self-decay of the target component corresponding to the target isotope during the reactor irradiation production process, determine the multiple isotopes produced and the relationship between the multiple isotopes.

[0017] Based on the various isotopes produced and the relationships between them, the reaction chain of the target used to produce the target isotope during reactor irradiation is determined.

[0018] In some implementations, the calculation formula for obtaining the trend of yield or specific activity of each isotope in the reaction chain over time includes:

[0019] Obtain the equations for the change in the number of nucleons of each isotope in the reaction chain over time;

[0020] Solve the equations for the change of the number of nucleons of each isotope in the reaction chain over time to obtain the equations for calculating the number of nucleons of each isotope in the reaction chain.

[0021] Based on the calculation equation for the number of nucleons of each isotope in the reaction chain, the specific activity calculation formula for each isotope is determined.

[0022] Based on the specific activity calculation formula of each isotope, a calculation formula is obtained to determine the trend of the yield of each isotope in the reaction chain over time.

[0023] In some implementations, determining the optimal irradiation duration for the target isotope based on a calculation formula that calculates the change trend of the yield or specific activity of each isotope in the reaction chain over time includes:

[0024] Based on the calculation formula of the change trend of yield or specific activity of each isotope in the reaction chain over time, the curve of the change of yield or specific activity of the target isotope over time is obtained.

[0025] Based on the curve of the yield or specific activity of the target isotope changing over time, the optimal irradiation duration of the target isotope is determined.

[0026] In some implementations, determining the optimal irradiation duration of the target isotope based on the curve of its yield or specific activity changing over time includes:

[0027] Based on the curve of the yield or specific activity of the target isotope changing over time, the slope trend of the curve is obtained.

[0028] Based on the slope trend of the curve, the optimal irradiation duration for the target isotope is determined.

[0029] In some implementations, determining the optimal irradiation duration of the target isotope based on the slope trend of the curve includes:

[0030] Obtain the time range in which the rate of change of the slope of the curve satisfies a preset threshold;

[0031] Based on the time range, the optimal irradiation duration for the target isotope is determined.

[0032] In some implementations, the parameters in the formula for calculating the yield or specific activity of each isotope in the reaction chain over time include the neutron capture cross section, half-life, decay constant, and molar mass of each isotope in the reaction chain.

[0033] In some implementations, the method is applied to an isotope irradiation optimal time calculation system.

[0034] To achieve the above objectives, a second aspect of this application provides a system for calculating the optimal time for reactor isotope irradiation, comprising:

[0035] The reaction chain acquisition module is used to acquire the reaction chain of a target used to produce the target isotope during reactor irradiation.

[0036] The formula acquisition module is used to obtain the calculation formula for the change trend of the yield or specific activity of each isotope in the reaction chain over time.

[0037] The time calculation module is used to determine the optimal irradiation duration of the target isotope based on the calculation formula of the change trend of the yield or specific activity of each isotope in the reaction chain over time.

[0038] In some implementations, obtaining the determined reaction chain of the target for producing the target isotope during reactor irradiation includes:

[0039] Based on the nuclear reaction and / or self-decay of the target component corresponding to the target isotope during the reactor irradiation production process, determine the multiple isotopes produced and the relationship between the multiple isotopes.

[0040] Based on the various isotopes produced and the relationships between them, the reaction chain of the target used to produce the target isotope during reactor irradiation is determined.

[0041] In some implementations, the reaction chain acquisition module is specifically used for

[0042] Obtain the equations for the change in the number of nucleons of each isotope in the reaction chain over time;

[0043] Solve the equations for the change of the number of nucleons of each isotope in the reaction chain over time to obtain the equations for calculating the number of nucleons of each isotope in the reaction chain.

[0044] Based on the calculation equation for the number of nucleons of each isotope in the reaction chain, the specific activity calculation formula for each isotope is determined.

[0045] Based on the specific activity calculation formula of each isotope, a calculation formula is obtained to determine the trend of the yield of each isotope in the reaction chain over time.

[0046] In some implementations, the formula retrieval module is specifically used for:

[0047] Based on the calculation formula of the change trend of yield or specific activity of each isotope in the reaction chain over time, the curve of the change of yield or specific activity of the target isotope over time is obtained.

[0048] Based on the curve of the yield or specific activity of the target isotope changing over time, the optimal irradiation duration of the target isotope is determined.

[0049] In some implementations, the time calculation module, when determining the optimal irradiation duration of the target isotope based on the curve of the yield or specific activity of the target isotope changing over time, is used for:

[0050] Based on the curve of the yield or specific activity of the target isotope changing over time, the slope trend of the curve is obtained.

[0051] Based on the slope trend of the curve, the optimal irradiation duration for the target isotope is determined.

[0052] In some implementations, the time calculation module, when determining the optimal irradiation duration of the target isotope based on the slope trend of the curve, is used for:

[0053] Obtain the time range in which the rate of change of the slope of the curve satisfies a preset threshold;

[0054] Based on the time range, the optimal irradiation duration for the target isotope is determined.

[0055] In some implementations, the parameters in the formula for calculating the yield or specific activity of each isotope in the reaction chain over time include the neutron capture cross section, half-life, decay constant, and molar mass of each isotope in the reaction chain.

[0056] In some implementations, the method is applied to an isotope irradiation optimal time calculation system.

[0057] To achieve the above objectives, a third aspect of this application provides an electronic device, including: a processor and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method described in the first aspect.

[0058] To achieve the above objectives, a fourth aspect of this application provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, are used to implement the method described in the first aspect.

[0059] To achieve the above objectives, a fifth aspect of this application provides a computer program product including a computer program that, when executed by a processor, implements the method described in the first aspect.

[0060] The method, apparatus, electronic equipment, and storage medium for calculating the optimal time of reactor isotope irradiation provided in this application derive a formula for calculating the yield or specific activity of each isotope in the reaction chain over time by determining the reaction chain of the isotope target. Based on this formula, the optimal irradiation time of the isotope is accurately obtained. This lays a solid foundation for calculating the optimal irradiation time of reactor isotopes and provides a guideline and reference for optimizing the reactor irradiation time of isotope target reactors.

[0061] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0062] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0063] Figure 1 A flowchart illustrating a method for calculating the optimal time for reactor isotope irradiation provided in an embodiment of this application;

[0064] Figure 2 A schematic diagram of the reaction chain of an isotope target provided as an example of this application;

[0065] Figure 3 A schematic diagram of the reaction chain of an isotope target provided as another example of this application;

[0066] Figure 4 A trend graph showing the specific activity variation of an isotope provided as an example of this application;

[0067] Figure 5 A block diagram of a calculation system for the optimal time of reactor isotope irradiation provided in an embodiment of this application;

[0068] Figure 6 This is a block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0069] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0070] The following describes, with reference to the accompanying drawings, a method, apparatus, and equipment for calculating the optimal time for reactor isotope irradiation according to embodiments of this application.

[0071] Figure 1This is a flowchart illustrating a method for calculating the optimal time for reactor isotope irradiation, as provided in an embodiment of this application.

[0072] It should be noted that the execution subject of the method for calculating the optimal time of reactor isotope irradiation in this application embodiment is the calculation system for the optimal time of reactor isotope irradiation in this application embodiment. The calculation system for the optimal time of reactor isotope irradiation can be configured in an electronic device so that the electronic device can perform the calculation function of the optimal time of reactor isotope irradiation.

[0073] like Figure 1 As shown, the method for calculating the optimal time for isotope irradiation of the reactor includes the following steps:

[0074] Step S101: Obtain the reaction chain of the target used to produce the target isotope during the reactor irradiation process.

[0075] As one implementation method, the method for determining the reaction chain includes: determining the multiple isotopes produced and the relationship between them based on the nuclear reactions and / or self-decay of the target device corresponding to the target isotope during the reactor irradiation production process; and obtaining the determined reaction chain of the target device used to produce the target isotope during the reactor irradiation process based on the multiple isotopes produced and the relationship between them.

[0076] It should be noted that this invention produces isotopes through a reactor, specifically by using neutron irradiation of a target within the reactor to generate the desired isotopes. During irradiation, the target often undergoes a series of nuclear reactions or decays, forming multiple isotopes (also called nuclides), known as the reaction chain for isotope irradiation production—that is, the reaction chain of the target used to produce the target isotope during reactor irradiation. Within this reaction chain, there are definite relationships between the isotopes. Therefore, to obtain accurate isotope yields, it is necessary to analyze the isotope reaction chain to lay the foundation for theoretical calculations of isotope yields.

[0077] For example, using commonly used medical radioisotopes 131 I, 177 Lu's target material 130 Te、 176 The reaction chain of Yb is analyzed and explained. The reaction chain analysis of other isotopes can be carried out by reference and will not be repeated.

[0078] 1) 130 Te's reaction chain

[0079] 131 The half-life of I is 8.02 days, and it decays through 100% β-decay to... 131Xe, with its beta rays having a maximum energy of 606.5 keV, can be used to treat thyroid diseases, while its gamma rays can be used for scanning organs such as the thyroid, liver, and lungs, as well as for functional determination of organs such as the kidneys and thyroid. Solid-state Xe is typically used. 130 TeO2 powder tablets are used as irradiation target materials, utilizing 130 Te(n, γ) 131 Te generation 131 Te, 131 Te decays via β-decay 131 I, 131 I decays via β into 131 Xe, 131 I can also be through 131 I(n, γ) 132 I disappeared. Therefore, with 130 Te is used to produce isotopes for targets. 131 The reaction chain of I is as follows: Figure 2 As shown:

[0080] 2) 176 Yb's reaction chain

[0081] 177 Lu is a low-energy beta nuclide with a half-life of 6.7 days. It emits beta particles with energies of 497 keV (78.6%), 384 keV (9.1%), and 176 keV (12.2%), with an average energy of 130 keV. During its decay, in addition to emitting beta particles, it also emits gamma rays. Beta particles have strong penetrating power and can directly irradiate local tumor cells, thus achieving targeted therapy; while gamma rays can be used for imaging to help doctors monitor treatment effectiveness. 176 Yb(n, γ) 177 Yb generation 177 Yb, 177 Yb decays via β into 177 Lu, 177 Lu decays via β. 177 Hf, 177 Lu can also be passed through 177 Lu(n, γ) 178 Lu disappeared. Therefore, with 176 Yb is used to produce isotopes for targets. 177 The reaction chain of Lu is as follows: Figure 3 As shown.

[0082] Step S102: Obtain the calculation formula for the change trend of yield or specific activity of each isotope in the reaction chain over time.

[0083] As one implementation method, a method for calculating the yield or specific activity of each isotope in a reaction chain over time includes: obtaining the equation for the change of the number of nucleons of each isotope in the reaction chain over time; solving the equation for the change of the number of nucleons of each isotope in the reaction chain over time to obtain the calculation equation for the number of nucleons of each isotope in the reaction chain; determining the calculation formula for the specific activity of each isotope based on the calculation equation for the number of nucleons of each isotope in the reaction chain; and obtaining the calculation formula for the change of the yield of each isotope in the reaction chain over time based on the calculation formula for the specific activity of each isotope.

[0084] In some embodiments, the parameters in the formula for calculating the yield or specific activity of each isotope in the reaction chain over time include the neutron capture cross section, half-life, decay constant, and molar mass of each isotope in the reaction chain.

[0085] The following is based on 176 Yb is used to produce isotopes for targets. 177 Taking the reaction chain of Lu as an example, we will give... 177 The derivation method for the formula of the specific activity of Lu isotope changing with time is similar for other isotopes, and will not be listed one by one.

[0086] 176 Yb、 177 Yb and 177 The neutron capture cross section, half-life, decay constant and molar mass of Lu are shown in Table 1.

[0087] Table 1: 177 Parameters related to the calculation of Lu specific activity

[0088]

[0089] According to 176 Yb is used to produce isotopes for targets. 177 The reaction chain of Lu yields nuclides. 176 Yb、 177 Yb and 177 The equation for the change of the nucleon number of Lu over time is:

[0090]

[0091]

[0092]

[0093] Where, N1(t) = 4.441 × 10 20 N2(0) = 0, N3(0) = 0 λ2 and λ3 represent the neutron flux rate of the reactor irradiation channel, respectively, and the nuclides are λ2 and λ3, respectively. 177Yb and nuclides 177 The decay constants of Lu, σ1 and σ3 are respectively the nuclides 176 Yb and nuclides 177 Neutron capture cross section of Lu.

[0094] Solving the above formula, we get:

[0095]

[0096]

[0097]

[0098] The formula for calculating specific activity A (Ci / g) is as follows:

[0099] A(Bq / g)=λ×N

[0100] A(Ci / g)=A(Bq / g) / 3.7E+10

[0101] Therefore, the above method can be used to obtain the calculation formula for the change trend of the specific activity of each isotope in the reaction chain over time.

[0102] It should be noted that the unit of yield is g, while the unit of specific activity is Ci / g, but the trends of the two are completely consistent.

[0103] Step S103: Based on the calculation formula of the change trend of yield or specific activity of each isotope in the reaction chain over time, determine the optimal irradiation time of the target isotope.

[0104] As one implementation method, a method for determining the optimal irradiation duration of a target isotope is based on a calculation formula that calculates the change trend of the yield or specific activity of each isotope in the reaction chain over time. This method includes: obtaining a curve showing the change of the yield or specific activity of the target isotope over time based on the calculation formula; and determining the optimal irradiation duration of the target isotope based on the curve showing the change of the yield or specific activity of the target isotope over time.

[0105] As one implementation method, a method for obtaining the yield or specific activity curve of a target isotope over time based on the calculation formula of the yield or specific activity of each isotope in the reaction chain over time includes: establishing an isotope irradiation optimal time calculation system based on the calculation formula of the yield or specific activity of each isotope in the reaction chain over time; setting parameter values ​​for the parameters in the calculation formula of the yield or specific activity of each isotope in the reaction chain over time; and obtaining the yield or specific activity curve of the target isotope over time based on the parameter values ​​through the isotope irradiation optimal time calculation system.

[0106] In some embodiments, a method for establishing an optimal time calculation system for isotope irradiation based on a calculation formula for the change trend of yield or specific activity of each isotope in the reaction chain over time includes: writing code in a selected programming language to implement the calculation formula for the change trend of yield or specific activity of each isotope in the reaction chain over time, and establishing an optimal time calculation system for isotope irradiation.

[0107] Therefore, based on the calculation formula for the change trend of the yield or specific activity of each isotope in the reaction chain over time, an isotope irradiation optimal time calculation system was developed and established so that the change trend of the specific activity or yield of various radioactive isotopes can be automatically calculated through the system.

[0108] In some embodiments, the steps involved in establishing an isotope irradiation optimal time calculation system include: first, defining the optimal irradiation duration variable for the isotope; then, determining that the target output of the calculation system is the trend of isotope specific activity or yield with irradiation time and the criterion for optimal irradiation duration; next, selecting the calculation formula for the specific activity or yield or the trend of specific activity with time for each isotope; selecting a programming language, such as Python, R, MATLAB, Java, etc.; designing the calculation system architecture, including modules for input processing, formula calculation, and result output; and finally, writing code using the selected programming language to implement the formula calculation.

[0109] In some embodiments, a method for determining the optimal irradiation duration of a target isotope based on a curve showing the change in yield or specific activity over time includes: obtaining the slope trend of the curve based on the curve showing the change in yield or specific activity of the target isotope over time; and determining the optimal irradiation duration of the target isotope based on the slope trend of the curve.

[0110] In some implementations, the method by which the time calculation module determines the optimal irradiation duration of the target isotope based on the slope change trend of the curve includes: obtaining the range of time points where the slope change rate of the curve satisfies a preset threshold; and determining the optimal irradiation duration of the target isotope based on the range of time points.

[0111] The following is also in the same format 176 Yb is used to produce isotopes for targets. 177 Taking the reaction chain of Lu as an example, we get 177 The trend of Lu isotope production is similar to that of other isotopes, and will not be listed one by one.

[0112] Input the assumed neutron flux rate of the reactor irradiation duct into the isotope irradiation optimal time calculation system. Obtain isotopes 177The trend of Lu's specific activity over time, such as Figure 4 As shown.

[0113] It should be noted that the neutron flux rate and isotope yield of the reactor irradiation channel are related to the optimal irradiation duration, and can be calculated based on the specific irradiation channel. When t = 22.24 days, 177 The specific activity of Lu is approximately 1.5407 Ci / g.

[0114] according to Figure 4 The trend graph of the specific activity of the isotopes shown can be used to calculate the optimal irradiation time of the isotopes, which can be determined by the isotope irradiation optimal time calculation system. The system can make judgments based on the slope trend of the curve in the trend graph. (The above...) 177 Taking Lu as an example, in the neutron flux rate of the irradiation channel Under these conditions, the optimal irradiation duration is 22-23 days.

[0115] The method for calculating the optimal time for reactor isotope irradiation in this application determines the reaction chain of the isotope target and derives the calculation formula for the yield or specific activity of each isotope in the reaction chain over time. Based on this calculation formula, the optimal irradiation time of the isotope is accurately obtained. This lays a solid foundation for calculating the optimal irradiation time of reactor isotopes and provides guidance and reference for optimizing the reactor irradiation time of isotope target reactors.

[0116] To achieve the above embodiments, this application also proposes a calculation system for the optimal time of reactor isotope irradiation. Figure 5 A block diagram of a system for calculating the optimal time for reactor isotope irradiation, provided as an embodiment of this application. Figure 5 As shown, the calculation system for the optimal time of reactor isotope irradiation may include: a reaction chain acquisition module 501, a formula acquisition module 502, and a time calculation module 503.

[0117] Among them, the reaction chain acquisition module 501 is used to acquire the reaction chain of the target used to produce the target isotope during the reactor irradiation process.

[0118] Formula acquisition module 502 is used to obtain the calculation formula for the change trend of yield or specific activity of each isotope in the reaction chain over time.

[0119] The time calculation module 503 is used to determine the optimal irradiation duration of the target isotope based on the calculation formula of the change trend of the yield or specific activity of each isotope in the reaction chain over time.

[0120] In some implementations, obtaining a defined reaction chain of a target for producing the target isotope during reactor irradiation includes:

[0121] Based on the nuclear reactions and / or self-decay of the target component corresponding to the target isotope during the reactor irradiation production process, the multiple isotopes produced and the relationships between the multiple isotopes are determined.

[0122] Based on the multiple isotopes produced and the relationships between them, the reaction chain of the target device used to produce the target isotope during reactor irradiation is obtained.

[0123] In some implementations, the reaction chain acquisition module 501 is specifically used for

[0124] Obtain the equations for the change in the number of nucleons of each isotope in the reaction chain over time;

[0125] Solve the equations for the change of nucleon number of each isotope in the reaction chain over time to obtain the equations for calculating the nucleon number of each isotope in the reaction chain.

[0126] Based on the calculation equation of the number of nucleons of each isotope in the reaction chain, the specific activity calculation formula of each isotope is determined.

[0127] Based on the specific activity calculation formula of each isotope, a calculation formula is obtained to obtain the trend of the yield of each isotope in the reaction chain changing over time.

[0128] In some implementations, the formula retrieval module 502 is specifically used for:

[0129] Based on the calculation formula of the change trend of yield or specific activity of each isotope in the reaction chain over time, the curve of the change of yield or specific activity of the target isotope over time is obtained.

[0130] Based on the curves showing the change in yield or specific activity over time for the target isotope, the optimal irradiation duration for the target isotope is determined.

[0131] In some implementations, the time calculation module 503, when determining the optimal irradiation duration of the target isotope based on the curve of yield or specific activity changing over time, is used for:

[0132] The curve of yield or specific activity over time is based on the curve of yield or specific activity of the target isotope over time, and the trend of the slope of the curve is obtained.

[0133] Based on the slope trend of the curve, the optimal irradiation time for the target isotope is determined.

[0134] In some implementations, the time calculation module 503, when determining the optimal irradiation duration of the target isotope based on the slope trend of the curve, is used for:

[0135] Obtain the time range in which the rate of change of the slope of the curve satisfies a preset threshold;

[0136] Based on the time range, the optimal irradiation duration for the target isotope is determined.

[0137] In some implementations, the parameters in the formula for calculating the yield or specific activity of each isotope in the reaction chain over time include the neutron capture cross section, half-life, decay constant, and molar mass of each isotope in the reaction chain.

[0138] It should be noted that the explanation of the above-described method for calculating the optimal time of reactor isotope irradiation also applies to the calculation system for the optimal time of reactor isotope irradiation in this embodiment, and will not be repeated here.

[0139] To implement the above embodiments, this application also proposes an electronic device. Please see [link to relevant documentation]. Figure 6 , Figure 6 This is a block diagram of the electronic device provided in an embodiment of this application. For example... Figure 6 As shown, the electronic device 600 includes: a processor 601 and a memory 602 communicatively connected to the processor 601; the memory 602 stores computer-executable instructions; the processor 601 executes the computer-executable instructions stored in the memory to implement the method provided in the foregoing embodiments.

[0140] To implement the above embodiments, this application also proposes a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods provided in the foregoing embodiments.

[0141] To implement the above embodiments, this application also proposes a computer program product, including a computer program that, when executed by a processor, implements the methods provided in the foregoing embodiments.

[0142] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0143] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0144] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0145] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0146] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0147] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0148] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0149] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method of calculating optimum time of isotope irradiation in a reactor, characterized in that, The method comprises the following steps: obtaining a reaction chain of a target for producing a target isotope during reactor irradiation; obtaining a calculation formula of a yield or specific activity of each isotope on the reaction chain over time; determining an optimal irradiation duration of the target isotope based on the calculation formula of the yield or specific activity of each isotope on the reaction chain over time; the obtaining of the reaction chain of the target for producing the target isotope during reactor irradiation comprises: determining a plurality of isotopes produced and a relationship between the isotopes based on nuclear reactions and / or self-decay of the target corresponding to the target isotope during reactor irradiation production; determining the reaction chain of the target for producing the target isotope during reactor irradiation based on the plurality of isotopes produced and the relationship between the isotopes.

2. The method of claim 1, wherein, The obtaining of the calculation formula of the yield or specific activity of each isotope on the reaction chain over time comprises: obtaining a nuclear number change equation of each isotope on the reaction chain over time; solving the nuclear number change equation of each isotope on the reaction chain to obtain a calculation equation of the nuclear number of each isotope on the reaction chain; determining a specific activity calculation formula of each isotope based on the calculation equation of the nuclear number of each isotope on the reaction chain; obtaining a calculation formula of a yield change trend of each isotope on the reaction chain over time based on the specific activity calculation formula of each isotope.

3. The method of claim 1, wherein, The determination of the optimal irradiation duration of the target isotope based on the calculation formula of the yield or specific activity of each isotope on the reaction chain over time comprises: obtaining a curve of the yield or specific activity of the target isotope over time based on the calculation formula of the yield or specific activity of each isotope on the reaction chain over time; determining the optimal irradiation duration of the target isotope based on the curve of the yield or specific activity of the target isotope over time.

4. The method of claim 3, wherein, The determination of the optimal irradiation duration of the target isotope based on the curve of the yield or specific activity of the target isotope over time comprises: obtaining a slope change trend of the curve based on the curve of the yield or specific activity of the target isotope over time; determining the optimal irradiation duration of the target isotope based on the slope change trend of the curve.

5. The method of claim 4, wherein, The determination of the optimal irradiation duration of the target isotope based on the slope change trend of the curve comprises: obtaining a time point range at which a slope change rate of the curve meets a preset threshold; determining the optimal irradiation duration of the target isotope according to the time point range.

6. The method of claim 1, wherein, The parameters in the calculation formula of the yield or specific activity of each isotope on the reaction chain over time comprise a neutron capture cross section, a half-life, a decay constant, and a molar mass of each isotope on the reaction chain.

7. The method of claim 1, wherein, The method is applied to an isotope optimal irradiation time calculation system.

8. A system for calculating optimum time of isotope irradiation in a reactor, characterized by comprises: a reaction chain obtaining module configured to obtain a reaction chain of a target for producing a target isotope during reactor irradiation; The method comprises the following steps: acquiring a reaction chain of a target for producing a target isotope in a reactor irradiation process, including: determining a plurality of isotopes produced and a relationship between the plurality of isotopes based on nuclear reactions and / or self-decay of the target for producing the target isotope in a reactor irradiation production process; and determining the reaction chain of the target for producing the target isotope in the reactor irradiation process based on the plurality of isotopes produced and the relationship between the plurality of isotopes. The formula acquisition module is configured to acquire a calculation formula of a change trend of a yield or specific activity of each isotope on the reaction chain over time. The time calculation module is configured to determine an optimal irradiation duration of the target isotope based on the calculation formula of the change trend of the yield or specific activity of each isotope on the reaction chain over time.

9. An electronic device, comprising: The method comprises the following steps: A processor and a memory connected in communication with the processor; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory to implement the method according to any one of claims 1-7.

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