Neutron moderation and collimation shielding optimization method based on BNCT

Abstract

The present invention relates to the field of shielding optimization technology, specifically to a neutron moderation and collimation shielding optimization method based on BNCT, comprising the following steps: based on the construction information of the cyclotron installation room and combined with the radiation shielding effect of the shielding wall material, the required thickness of the shielding wall is calculated to obtain the shielding wall construction thickness analysis result. The present invention, by considering the construction information of the cyclotron and the pre-selected shielding materials, and calculating the thickness of the shielding wall, ensures the accuracy of the construction and the maximization of the shielding effect. In the selection of radiation blocking materials, by matching the channel requirements with the material properties, the selection of the channel material is optimized, and the evaluation of the material usage ensures the effective use of resources and the optimization of the project cost. By introducing the cost-benefit analysis, combined with the material cost and the construction cost, as well as the evaluation of the subsequent maintenance costs and the service life, the most economical and effective shielding solution can be selected for medical facilities.

Description

Technical Field

[0001] The present invention relates to the technical field of shielding optimization, and in particular to a neutron moderation and collimation shielding optimization method based on BNCT. Background Art

[0002] The field of shielding optimization technology mainly involves the development and improvement of methods and materials for protecting organisms from harmful radiation. The core of shielding technology lies in the selection and design of suitable materials and structural layouts to absorb or reflect radiation energy through materials, thereby reducing the potential harm of radiation to personnel and equipment. The key purpose of shielding optimization is to enhance shielding efficiency, reduce radiation dose, and ensure radiation safety. The technology is widely used in the fields of medicine, industry and research, especially in the storage, transportation and use of radioactive materials.

[0003] Among them, the optimization of neutron moderation and collimation shielding based on BNCT involves the development of shielding solutions for the moderation and collimation technology of neutron sources with the help of the needs of boron neutron capture therapy. The optimization aims to improve the treatment effect while minimizing the radiation exposure to surrounding normal tissues. By adjusting the shielding material and structure, the neutron beam can be controlled more accurately, making it more efficient and safer when reaching the treatment area. The technology not only improves the treatment ability of BNCT, but also enhances its feasibility and safety in clinical practice.

[0004] Traditional shielding methods fail to fully consider specific application scenarios and precise shielding requirements, resulting in a large imbalance between shielding effect and cost-effectiveness. For example, in medical radiation environments, the lack of optimization of shielding materials and structures for specific radiation sources can lead to over-design or insufficient shielding, affecting treatment effects or increasing unnecessary costs. Traditional methods ignore subsequent maintenance costs and material life assessments, which will increase long-term operating costs. Failure to effectively adapt to radiation safety hazards or increased treatment costs caused by precise treatment directly affects the quality and economic benefits of medical services. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a neutron moderation and collimation shielding optimization method based on BNCT.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a neutron slowing down and collimation shielding optimization method based on BNCT, comprising the following steps:

[0007] S1: Based on the construction information of the cyclotron installation room, according to the shielding wall materials pre-selected in the project, combined with the radiation shielding effect of the shielding wall materials, the required thickness of the shielding wall is calculated to obtain the analysis results of the shielding wall construction thickness;

[0008] S2: Based on the analysis result of the shielding wall construction thickness, according to the channel requirements of BNCT treatment, by analyzing the radiation blocking material library, identifying the matching channel radiation blocking material, and according to the radiation blocking effect of the channel radiation blocking material, analyzing the required thickness of the differentiated channel radiation blocking material in the channel, and obtaining the channel material thickness analysis result;

[0009] S3: Based on the analysis result of the thickness of the channel material and the channel radius required for BNCT treatment, the diameter of the construction channel that needs to be reserved for the shielding wall is analyzed, the amount of channel radiation blocking material is evaluated, and the analysis result of the channel material usage is obtained;

[0010] S4: Based on the analysis results of the hole material usage, combined with the material cost and construction cost, the use cost of the hole radiation blocking material is evaluated, and combined with the subsequent maintenance costs and service life of the hole radiation blocking material, the target hole shielding material is selected, and the hole construction is carried out according to the corresponding reserved construction hole diameter to obtain the hole construction result.

[0011] The present invention is improved in that the steps of obtaining the analysis result of the shielding wall construction thickness are as follows:

[0012] S111: Based on the construction information of the cyclotron installation room, extract the shielding wall material information pre-selected for the project, and collect the radiation shielding effect data of the shielding wall material to obtain the shielding wall material related data;

[0013] S112: Based on the shielding wall material associated data, by formula:

[0014] ,

[0015] Calculate the required thickness D of the shielding wall and obtain the analysis result of the shielding wall construction thickness, where: represents the radiation attenuation coefficient of the shielding wall material, is the thickness adjustment factor, and They represent the radiation intensity without shielding and the expected shielding respectively.

[0016] The present invention is improved in that the method for identifying the matching channel radiation blocking material is:

[0017] S211: according to the current requirements of tunnel construction, the mechanical strength requirements and boron neutron compatibility data of the differentiated radiation blocking material library are extracted through the radiation blocking material library to obtain material matching association data;

[0018] S212: Based on the material matching associated data, by formula:

[0019] ,

[0020] Calculate the material matching degree P, where P represents the matching degree, S is the material's mechanical strength index, and C is the material's boron neutron compatibility. and is the weight parameter, and is the adjustment factor;

[0021] S213: Based on the matching degree P of the material, the material is compared with a preset matching degree threshold, and the material whose matching degree exceeds the matching degree threshold is identified to obtain a matching material identification result.

[0022] The present invention is improved in that the steps of obtaining the results of the pore material thickness analysis are as follows:

[0023] S221: Based on the matching material identification result, collecting radiation shielding effect data of the channel radiation blocking material to obtain performance data of the channel radiation blocking material;

[0024] S222: Based on the performance data of the pore radiation blocking material, the formula:

[0025] ,

[0026] Calculate the thickness T of the channel radiation blocking material and obtain the channel material thickness analysis result, where T is the channel radiation blocking material thickness, is the radiation intensity when not shielded, is the expected radiation intensity after shielding, is the construction redundancy coefficient, is the radiation attenuation coefficient of the channel radiation blocking material.

[0027] The present invention is improved in that the method for analyzing the diameter of the construction channel that needs to be reserved in the shielding wall is:

[0028] S311: based on the analysis result of the hole material thickness, extracting the hole radius data required for BNCT treatment, and obtaining the construction hole diameter correlation data;

[0029] S312: Based on the construction channel diameter correlation data, the formula:

[0030] ,

[0031] Calculate the reserved construction channel diameter Z and obtain the reserved construction channel diameter analysis results, where r is the channel radius required for BNCT treatment, T is the thickness of the channel radiation blocking material, is the construction redundancy coefficient, and Z is the diameter of the construction channel that needs to be reserved.

[0032] The present invention is improved in that the step of obtaining the pore material dosage analysis result is:

[0033] S321: Based on the analysis result of the hole material thickness, the hole radius size and the required thickness of the shielding wall required for BNCT treatment are collected to obtain material usage correlation data;

[0034] S322: Based on the material usage association data, the formula:

[0035] ,

[0036] Calculate the amount of channel radiation blocking material and obtain the channel material usage analysis results, where V represents the amount of channel radiation blocking material, r is the channel radius required for BNCT treatment, T is the thickness of the channel radiation blocking material, and D is the required thickness of the shielding wall. is the construction waste coefficient, is the ratio of pi.

[0037] The present invention is improved in that the method for evaluating the use cost of the channel radiation blocking material is:

[0038] S411: Based on the analysis result of the hole material usage, extract the material cost data, obtain the construction time and labor cost data, and obtain cost-related data;

[0039] S412: Based on the cost-related data, by formula:

[0040] ,

[0041] Calculate the cost of materials used , the cost analysis results of the use of duct radiation blocking materials are obtained, where c is the unit material cost, V is the amount of duct radiation blocking materials used, n is the construction time, and p is the labor cost per unit time. The cost of material usage.

[0042] The present invention is improved in that the steps of obtaining the hole construction results are:

[0043] S421: Based on the cost of using the material , extract the subsequent maintenance costs of materials and the corresponding service life data to obtain benefit-related data;

[0044] S422: Based on the benefit-related data, by formula:

[0045] ,

[0046] Calculate the material's benefit coefficient E, where E represents the benefit coefficient. is the weight coefficient, Y is the service life, M is the subsequent maintenance cost, is the cost of material usage, is the adjustment factor;

[0047] S423: Based on the benefit coefficient E of the material, by comparing the benefit coefficients of differentiated channel radiation blocking materials, select the target channel radiation blocking material, implement channel construction according to the corresponding reserved construction channel diameter, and obtain the channel construction result.

[0048] Compared with the prior art, the advantages and positive effects of the present invention are:

[0049] In the present invention, by considering the construction information of the cyclotron and the pre-selected shielding materials, and calculating the thickness of the shielding wall, the accuracy of the construction and the maximization of the shielding effect are guaranteed. In the selection of radiation blocking materials, by matching the channel requirements with the material properties, the selection of the channel material is optimized, and the evaluation of the material usage ensures the effective utilization of resources and the optimization of project costs. By introducing cost-benefit analysis, combining material costs with construction costs, as well as the evaluation of subsequent maintenance costs and service life, the most economical and effective shielding solution can be selected for medical facilities, achieving the optimal balance between radiation safety and cost-effectiveness, and improving the safety and economy of BNCT treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a flow chart of the method of the present invention;

[0051] Figure 2 A flow chart for obtaining the shield wall construction thickness analysis result of the present invention;

[0052] Figure 3 A flow chart for identifying matching aperture radiation blocking materials for the present invention;

[0053] Figure 4 A flow chart for obtaining the results of the pore material thickness analysis of the present invention;

[0054] Figure 5 A flow chart for analyzing the diameter of the construction channel that needs to be reserved for the shielding wall in the present invention;

[0055] Figure 6 A flow chart for obtaining the pore material usage analysis results of the present invention;

[0056] Figure 7 Flow chart for evaluating the cost of using the aperture radiation barrier material for the present invention;

[0057] Figure 8 The present invention is a flow chart for obtaining the results of duct construction. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0059] See also Figure 1 The present invention provides a technical solution: a neutron slowing down and collimation shielding optimization method based on BNCT, comprising the following steps:

[0060] S1: Based on the construction information of the cyclotron installation room, according to the shielding wall materials pre-selected in the project, combined with the radiation shielding effect of the shielding wall materials, the required thickness of the shielding wall is calculated to obtain the analysis results of the shielding wall construction thickness;

[0061] S2: Based on the analysis results of shielding wall construction thickness and according to the channel requirements of BNCT treatment, the matching channel radiation blocking materials are identified by analyzing the radiation blocking material library, and the required thickness of the differentiated channel radiation blocking materials in the channel is analyzed according to the radiation blocking effect of the channel radiation blocking materials to obtain the channel material thickness analysis results;

[0062] S3: Based on the analysis results of the hole material thickness and the hole radius required for BNCT treatment, the diameter of the construction hole that needs to be reserved in the shielding wall is analyzed, the amount of hole radiation blocking material is evaluated, and the analysis results of the hole material usage are obtained;

[0063] S4: Based on the analysis results of the hole material usage, combined with the material cost and construction cost, the use cost of the hole radiation blocking material is evaluated. Combined with the subsequent maintenance cost and service life of the hole radiation blocking material, the target hole shielding material is selected, and the hole construction is carried out according to the corresponding reserved construction hole diameter to obtain the hole construction result.

[0064] The results of the shielding wall construction thickness analysis include the wall material type, wall thickness and expected radiation reduction rate; the results of the channel material thickness analysis include the material's radiation blocking rate, material thickness and expected radiation blocking performance; the results of the channel material usage analysis include the total amount of material required and the construction channel diameter; the channel construction results include the selected channel radiation blocking material, the corresponding cost-effectiveness and the expected maintenance cycle.

[0065] See also Figure 2 , the steps to obtain the analysis results of shielding wall construction thickness are:

[0066] S111: Based on the construction information of the cyclotron installation room, extract the shielding wall material information pre-selected for the project, and collect the radiation shielding effect data of the shielding wall material to obtain the shielding wall material related data;

[0067] S112: Based on the shielding wall material associated data, by formula:

[0068] ,

[0069] Calculate the required thickness D of the shielding wall and obtain the analysis result of the shielding wall construction thickness, where: represents the radiation attenuation coefficient of the shielding wall material, is the thickness adjustment factor, and They represent the radiation intensity without shielding and the expected shielding respectively.

[0070] formula: ,

[0071] Parameter details and how to obtain them:

[0072] : The radiation attenuation coefficient of the shielding wall material indicates the material's ability to block radiation. The parameter is determined experimentally and can be obtained by analyzing the physical and chemical properties of the shielding material. Usually the laboratory will measure the material's attenuation ability to the target radiation type and record the data.

[0073] : Unshielded radiation intensity, that is, the radiation level without any shielding. This parameter is obtained through the standard output or historical data of the radiation source and is set according to the type and intensity of the radiation source.

[0074] : The expected radiation intensity after shielding is a parameter set by safety standards, which specifies the level that the radiation intensity should reach behind the shielding wall. It reflects the requirements for shielding effectiveness and can be set according to radiation safety standards.

[0075] : The expected radiation intensity after shielding is a parameter set by safety standards, which specifies the level that the radiation intensity should reach behind the shielding wall. It reflects the requirements for shielding effectiveness and can be set according to radiation safety standards.

[0076] =0.02: Radiation attenuation coefficient, unit is , this value means that the material can reduce the radiation intensity by about 2% per centimeter, =1000 mSv, =10 mSv, =1.1: Thickness adjustment factor, taking into account construction deviations and variations in material properties.

[0077] Calculate the required thickness D of the shielding wall:

[0078] ,

[0079] Calculation results , indicating that the shielding wall should be constructed to a thickness of at least 253.275 cm, because considering the material's weaker radiation attenuation ability, a thicker shielding wall is required to meet the same radiation shielding requirements. The calculation results ensure that even with construction errors and material inhomogeneities, the actual performance of the shielding wall can still meet the expected safety standards.

[0080] See also Figure 3 , the method for identifying matching aperture radiation blocking materials is:

[0081] S211: according to the current requirements of tunnel construction, the mechanical strength requirements and boron neutron compatibility data of the differentiated radiation blocking material library are extracted through the radiation blocking material library to obtain material matching association data;

[0082] S212: Based on the material matching associated data, by formula:

[0083] ,

[0084] Calculate the material matching degree P, where P represents the matching degree, S is the material's mechanical strength index, and C is the material's boron neutron compatibility. and is the weight parameter, and is the adjustment factor;

[0085] S213: Based on the matching degree P of the material, the material is compared with a preset matching degree threshold, and the material whose matching degree exceeds the matching degree threshold is identified to obtain a matching material identification result.

[0086] formula: ,

[0087] Parameter details and how to obtain them:

[0088] S: is an indicator of the mechanical strength of a material, usually determined by standard mechanical tests such as pressure or impact tests. These tests assess the material's ability to withstand stress, and the results are used to predict how the material will perform in actual engineering applications.

[0089] C: The boron neutron compatibility of the material, which is measured by radiation attenuation experiments. The experiment determines the compatibility by analyzing the material's blocking efficiency against boron neutron radiation.

[0090] Weight Parameters and : Parameters are adjusted according to project requirements and previous experimental results to balance the influence of mechanical strength and adaptability, ensuring that all factors are properly considered during the material selection process.

[0091] Adjustment factor and : The coefficient is used to adjust the flexibility and sensitivity of the logarithmic expression of mechanical strength, making the logarithmic function more adaptable to mechanical strength data in different ranges.

[0092] Calculation example:

[0093] Set the specific parameters as follows:

[0094] Mechanical strength S = 85MPa (common strength value for engineering materials), boron neutron compatibility C = 0.75 (this indicates that the material has good radiation blocking performance, usually between 0 and 1, 1 being the best), weight coefficient =0.6 and = 0.4 (this weight setting reflects that mechanical strength is slightly more important in this project), adjustment factor = 0.1 and =5 (the coefficient helps adjust the response of the logarithmic function to ensure that it properly reflects the importance of mechanical strength in the calculation process).

[0095] Calculate the matching degree P:

[0096] ,

[0097] The calculated matching degree , indicating that the material is relatively suitable for the current BNCT treatment channel requirements after considering mechanical strength and radiation compatibility. Higher matching values ​​reflect the material's potential to meet treatment needs, including adaptability in terms of protection and structural strength.

[0098] See also Figure 4 , the steps to obtain the analysis results of the pore material thickness are:

[0099] S221: Based on the matching material identification result, collecting radiation shielding effect data of the channel radiation blocking material to obtain performance data of the channel radiation blocking material;

[0100] S222: Based on the performance data of the pore radiation blocking material, the formula:

[0101] ,

[0102] Calculate the thickness T of the channel radiation blocking material and obtain the channel material thickness analysis result, where T is the channel radiation blocking material thickness, is the radiation intensity when not shielded, is the expected radiation intensity after shielding, is the construction redundancy coefficient, is the radiation attenuation coefficient of the channel radiation blocking material.

[0103] formula: ,

[0104] Parameter details and how to obtain them:

[0105] : Radiation attenuation coefficient, usually determined experimentally, involves measuring how effectively a particular material blocks radiation of a certain energy level. Experimental data may be obtained from previous scientific studies or from technical specifications provided by the material supplier.

[0106] and : It is the initial radiation intensity when unshielded and is directly determined by the output characteristics of the radiation source and is usually specified in the operating manual of the radiation equipment. is the expected radiation intensity after shielding, set according to safety standards.

[0107] : Construction redundancy factor is set based on engineering practice and historical data to account for errors in construction and material performance variations. This factor ensures that the calculated material thickness has an additional safety margin and is usually determined by engineers based on project experience.

[0108] Calculation example:

[0109] Set the parameters as follows:

[0110] Radiation attenuation coefficient , the initial radiation intensity , the expected radiation intensity after shielding , construction redundancy coefficient .

[0111] Calculation process:

[0112] Calculate the required channel material thickness:

[0113] ,

[0114] Calculated required thickness of the channel material , approximately 39 cm thick material is required to reduce radiation to 4 mSv / h. The introduced construction redundancy factor provides additional safety, ensuring effective radiation shielding even in the face of construction errors or fluctuations in material properties.

[0115] See also Figure 5 , the method for analyzing the diameter of the construction channel that needs to be reserved for the shielding wall is:

[0116] S311: based on the analysis result of the hole material thickness, extracting the hole radius data required for BNCT treatment, and obtaining the construction hole diameter correlation data;

[0117] S312: Based on the construction channel diameter correlation data, the formula:

[0118] ,

[0119] Calculate the reserved construction channel diameter Z and obtain the reserved construction channel diameter analysis results, where r is the channel radius required for BNCT treatment, T is the thickness of the channel radiation blocking material, is the construction redundancy coefficient, and Z is the diameter of the construction channel that needs to be reserved.

[0120] formula: ,

[0121] Parameter details and how to obtain them:

[0122] r: The channel radius required for BNCT treatment, specifies the radius size of the channel, and is set based on the treatment range.

[0123] T: Thickness of the radiation blocking material of the hole, calculated by the previous method.

[0124] : Construction redundancy factor, used to increase the safety margin of the design, taking into account possible errors and fluctuations in material properties in actual construction.

[0125] Calculation example:

[0126] The following parameters are set: Aperture radius r = 10 cm: the size of the aperture required for treatment. Barrier material thickness T = 20 cm: the minimum thickness to ensure radiation safety. Construction redundancy factor =1.1: A slightly higher redundancy factor is set to take into account construction errors and variations in material properties.

[0127] Calculation process:

[0128] ,

[0129] The calculated diameter of the construction channel Z=66cm that needs to be reserved for the shielding wall. The result ensures that the channel size is large enough to not only accommodate the necessary radiation blocking materials, but also reserve enough construction space, taking into account the material and construction errors that may occur in actual construction. Such a design improves the flexibility of construction and the safety of the final structure.

[0130] See also Figure 6 , the steps for obtaining the results of the pore material dosage analysis are as follows:

[0131] S321: Based on the analysis result of the hole material thickness, the hole radius size and the required thickness of the shielding wall required for BNCT treatment are collected to obtain material usage correlation data;

[0132] S322: Based on the material usage association data, the formula:

[0133] ,

[0134] Calculate the amount of channel radiation blocking material and obtain the channel material usage analysis results, where V represents the amount of channel radiation blocking material, r is the channel radius required for BNCT treatment, T is the thickness of the channel radiation blocking material, and D is the required thickness of the shielding wall. is the construction waste coefficient, is the ratio of pi.

[0135] formula: ,

[0136] Parameter details and how to obtain them:

[0137] r: The channel radius required for BNCT treatment, specifies the radius size of the channel, and is set based on the treatment range.

[0138] T: Thickness of the radiation blocking material of the hole, calculated by the previous method.

[0139] D: Required thickness of the shielding wall, calculated in the previous step.

[0140] : Waste coefficient in the construction process, used to take into account the additional material requirements caused by improper material cutting and assembly during actual construction.

[0141] Calculation example:

[0142] Set the following parameters:

[0143] The radius of the hole is r = 20 cm, the thickness of the barrier material is T = 20 cm, the thickness of the shielding wall is D = 200 cm, and the waste coefficient is =1.2.

[0144] Calculation process:

[0145] ,

[0146] Calculated material usage , indicating that after considering the new channel radius, material thickness, and shielding wall thickness, it is estimated that approximately 905 thousand cubic centimeters of radiation blocking material will be required. The value includes the expected construction waste to ensure that there is enough material in the actual construction to handle possible losses and meet the shielding effect requirements.

[0147] See also Figure 7 , the method for evaluating the cost of using channel radiation barrier materials is:

[0148] S411: Based on the analysis result of the hole material usage, extract the material cost data, obtain the construction time and labor cost data, and obtain cost-related data;

[0149] S412: Based on the cost-related data, by formula:

[0150] ,

[0151] Calculate the cost of materials used , the cost analysis results of the use of duct radiation blocking materials are obtained, where c is the unit material cost, V is the amount of duct radiation blocking materials used, n is the construction time, and p is the labor cost per unit time. The cost of material usage.

[0152] formula: ,

[0153] The meaning and acquisition method of parameters:

[0154] c: Unit material cost, the price per cubic meter or per kilogram obtained from the material supplier.

[0155] V: The amount of channel radiation blocking material, calculated by the previous method.

[0156] n: Construction time, set by the construction team or project requirements.

[0157] p: Labor cost per unit time, obtained from labor market research or company wage standards.

[0158] Calculation example:

[0159] Set the unit material cost c = 500 yuan / cubic meter, the required material volume V = 100 cubic meters, the unit labor price p = 15 yuan / hour, and the total labor hours required n = 80 hours.

[0160] Cost calculation:

[0161] ,

[0162] The calculation results show that the cost is 51,200 yuan, of which 50,000 yuan is used for material procurement and 1,200 yuan is used to pay labor costs.

[0163] See also Figure 8 , the steps to obtain the hole construction results are:

[0164] S421: Based on the cost of using the material , extract the subsequent maintenance costs of materials and the corresponding service life data to obtain benefit-related data;

[0165] S422: Based on the benefit-related data, by formula:

[0166] ,

[0167] Calculate the material's benefit coefficient E, where E represents the benefit coefficient. is the weight coefficient, Y is the service life, M is the subsequent maintenance cost, is the cost of material usage, is the adjustment factor;

[0168] S423: Based on the benefit coefficient E of the material, by comparing the benefit coefficients of differentiated channel radiation blocking materials, select the target channel radiation blocking material, implement channel construction according to the corresponding reserved construction channel diameter, and obtain the channel construction result.

[0169] formula: ,

[0170] The meaning and acquisition method of parameters:

[0171] Weight coefficient : A coefficient used to adjust the impact of useful life, usually set by project managers or decision makers based on the specific needs of the project and the expected return on investment, to improve the applicability and flexibility of the model in different project scenarios.

[0172] Service life Y: indicates the expected effective service life of the material or the entire BNCT equipment, which is usually set based on historical data and experience of similar projects. The setting of service life needs to take into account the durability of materials and the frequency of technology updates.

[0173] Maintenance cost M: includes the estimated maintenance, repair or replacement costs of the material during its use. Costs can be obtained through historical data analysis, supplier quotations or industry standards.

[0174] Cost of materials used : Calculated by the previous steps.

[0175] Adjustment factor : It is a coefficient used to balance the impact of maintenance costs and total costs on benefit evaluation, and is set according to the specific needs of the project and cost control objectives.

[0176] Calculation example:

[0177] Set the following parameters:

[0178] =1.2, set based on the expected high benefits of the project. Y=10 years, based on the standard service life of similar projects. M=5,000 yuan / year, based on historical maintenance data and industry average. =51200 yuan, =0.9, which is set to reduce the pressure of maintenance expenses and total costs on benefit evaluation.

[0179] Calculation formula:

[0180] ,

[0181] The calculated benefit coefficient is 0.419, and the result helps decision makers evaluate the use value of the material and decide whether to use it.

[0182] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A neutron moderation and collimation shielding optimization method based on BNCT, characterized in that: The following steps are involved: S1: Based on the construction information of the cyclotron installation room, according to the shielding wall materials pre-selected in the project, combined with the radiation shielding effect of the shielding wall materials, the required thickness of the shielding wall is calculated to obtain the analysis results of the shielding wall construction thickness; S2: Based on the analysis result of the shielding wall construction thickness, according to the channel requirements of BNCT treatment, by analyzing the radiation blocking material library, identifying the matching channel radiation blocking material, and according to the radiation blocking effect of the channel radiation blocking material, analyzing the required thickness of the differentiated channel radiation blocking material in the channel, and obtaining the channel material thickness analysis result; The method for identifying the matching aperture radiation blocking material is: S211: according to the current requirements of tunnel construction, the mechanical strength requirements and boron neutron compatibility data of the differentiated radiation blocking material library are extracted through the radiation blocking material library to obtain material matching association data; S212: Based on the material matching associated data, by formula: ， Calculate the material matching degree P, where P represents the matching degree, S is the material's mechanical strength index, and C is the material's boron neutron compatibility. and is the weight parameter, and is the adjustment factor; S213: Based on the matching degree P of the material, the material is compared with a preset matching degree threshold, the material whose matching degree exceeds the matching degree threshold is identified, and a matching material identification result is obtained; S3: Based on the analysis result of the thickness of the channel material and the channel radius required for BNCT treatment, the diameter of the construction channel that needs to be reserved for the shielding wall is analyzed, the amount of channel radiation blocking material is evaluated, and the analysis result of the channel material usage is obtained; S4: Based on the analysis results of the hole material usage, combined with the material cost and construction cost, the use cost of the hole radiation blocking material is evaluated, and combined with the subsequent maintenance costs and service life of the hole radiation blocking material, the target hole shielding material is selected, and the hole construction is carried out according to the corresponding reserved construction hole diameter to obtain the hole construction result.

2. The method for optimizing neutron moderation and collimation shielding based on BNCT according to claim 1, characterized in that: The steps for obtaining the shielding wall construction thickness analysis result are as follows: S111: Based on the construction information of the cyclotron installation room, extract the shielding wall material information pre-selected for the project, and collect the radiation shielding effect data of the shielding wall material to obtain the shielding wall material related data; S112: Based on the shielding wall material associated data, by formula: ， Calculate the required thickness D of the shielding wall and obtain the analysis result of the shielding wall construction thickness, where: represents the radiation attenuation coefficient of the shielding wall material, is the thickness adjustment factor, and They represent the radiation intensity without shielding and the expected shielding respectively.

3. The method for optimizing neutron moderation and collimation shielding based on BNCT according to claim 1, characterized in that: The steps for obtaining the pore material thickness analysis result are as follows: S221: Based on the matching material identification result, collecting radiation shielding effect data of the channel radiation blocking material to obtain performance data of the channel radiation blocking material; S222: Based on the performance data of the pore radiation blocking material, the formula: ， Calculate the thickness T of the channel radiation blocking material and obtain the channel material thickness analysis result, where T is the channel radiation blocking material thickness, is the radiation intensity when not shielded, is the expected radiation intensity after shielding, is the construction redundancy coefficient, is the radiation attenuation coefficient of the channel radiation blocking material.

4. The method for optimizing neutron moderation and collimation shielding based on BNCT according to claim 1, characterized in that: The method for analyzing the diameter of the construction channel that needs to be reserved for the shielding wall is: S311: based on the analysis result of the hole material thickness, extracting the hole radius data required for BNCT treatment, and obtaining the construction hole diameter correlation data; S312: Based on the construction channel diameter correlation data, the formula: ， Calculate the reserved construction channel diameter Z and obtain the reserved construction channel diameter analysis results, where r is the channel radius required for BNCT treatment, T is the thickness of the channel radiation blocking material, is the construction redundancy coefficient, and Z is the diameter of the construction channel that needs to be reserved.

5. The method for optimizing neutron moderation and collimation shielding based on BNCT according to claim 1, characterized in that: The steps for obtaining the pore material dosage analysis result are as follows: S321: Based on the analysis result of the hole material thickness, the hole radius size and the required thickness of the shielding wall required for BNCT treatment are collected to obtain material usage correlation data; S322: Based on the material usage association data, the formula: ， Calculate the amount of channel radiation blocking material and obtain the channel material usage analysis results, where V represents the amount of channel radiation blocking material, r is the channel radius required for BNCT treatment, T is the thickness of the channel radiation blocking material, and D is the required thickness of the shielding wall. is the construction waste coefficient, is the ratio of pi.

6. The method for optimizing neutron moderation and collimation shielding based on BNCT according to claim 1, characterized in that: The method for evaluating the use cost of the duct radiation blocking material is: S411: Based on the analysis result of the hole material usage, extract the material cost data, obtain the construction time and labor cost data, and obtain cost-related data; S412: Based on the cost-related data, by formula: ， Calculate the cost of materials used , the cost analysis results of the use of duct radiation blocking materials are obtained, where c is the unit material cost, V is the amount of duct radiation blocking materials used, n is the construction time, and p is the labor cost per unit time. The cost of material usage.

7. The BNCT-based neutron moderation and collimation shielding optimization method according to claim 6, characterized in that: The steps for obtaining the hole construction results are: S421: Based on the cost of using the material , extract the subsequent maintenance costs of materials and the corresponding service life data to obtain benefit-related data; S422: Based on the benefit-related data, by formula: ， Calculate the material's benefit coefficient E, where E represents the benefit coefficient. is the weight coefficient, Y is the service life, M is the subsequent maintenance cost, is the cost of material usage, is the adjustment factor; S423: Based on the benefit coefficient E of the material, by comparing the benefit coefficients of differentiated channel radiation blocking materials, select the target channel radiation blocking material, implement channel construction according to the corresponding reserved construction channel diameter, and obtain the channel construction result.

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