Method and system for evaluating displacement damage of integrated radiation field based on equivalent dose

Abstract

The application discloses a comprehensive radiation field displacement damage evaluation method and system based on equivalent dose, which can transform different environments into one environment for verification, analysis and simulation, and ensures that a new spacecraft is adapted to an on-orbit comprehensive radiation environment. The method comprises the following steps: step 1, evaluating a neutron displacement damage dose of a nuclear reactor faced by the spacecraft and a displacement damage dose formed by space natural radiation; step 2, obtaining a total displacement damage dose under a comprehensive radiation environment; step 3, evaluating a displacement damage equivalent flux according to the total displacement damage dose under the comprehensive radiation environment, and then obtaining an anti-displacement damage capability of the spacecraft under the comprehensive radiation field; and step 4, adjusting a layout position of sensitive equipment on the spacecraft and designing a local shielding according to the anti-displacement damage capability of the spacecraft under the comprehensive radiation field, and repeatedly executing steps 1 to 3 until the anti-displacement damage capability of the spacecraft under the comprehensive radiation field meets application requirements of the comprehensive radiation field.

Description

Technical Field

[0001] This invention relates to the field of spacecraft technology, and specifically to a method and system for evaluating displacement damage in a comprehensive radiation field based on equivalent dose. Background Technology

[0002] As humanity's exploration of the universe deepens, various deep space exploration missions are emerging one after another, placing higher demands on space propulsion and energy supply. Currently used solar and chemical energy sources both have significant shortcomings in deep space exploration. Solar energy requires a rapidly increasing solar array size as mission distance increases, directly affecting spacecraft configuration, control, and scale; chemical energy is limited by propellant capacity. Space nuclear propulsion offers advantages such as independence from the sun, autonomous energy generation, a wide power range, high energy density, and strong environmental adaptability. It can significantly increase the level and duration of available electrical power in space, making it suitable for space missions where solar energy is difficult to obtain or where power requirements are high. It is one of the most promising energy forms for space exploration. For example, patent publication number CN114771874 provides a micro-configuration for space nuclear propulsion.

[0003] Nuclear reactors release a large number of radiation particles during neutron moderation and nuclear decay energy level transitions, mainly including alpha rays, beta rays, gamma rays, and neutron flux. Since alpha rays and beta rays have poor penetrability and low energy, they can be completely shielded by thin metal plates; gamma rays and neutrons are the focus of radiation protection.

[0004] Currently, radiation protection for spacecraft primarily considers the total ionization dose effect caused by protons and electrons in the space radiation belts. Although displacement damage caused by natural space radiation is recognized, it has not received sufficient attention in engineering development. Furthermore, since displacement damage in the space radiation environment is mainly caused by high-energy protons, proton sources are often used in experimental methods to simulate the effects of displacement damage. For example, CN104297585A provides an experimental method for evaluating the effects of space displacement damage using high-energy protons.

[0005] For spacecraft employing nuclear reactors, the neutron radiation environment generated by the reactor cannot be ignored, and its resulting displacement damage effect must be taken seriously and assessed. On the other hand, the displacement effect from neutrons in ground-based reactors is generally assessed using neutron irradiation. Therefore, in spacecraft employing nuclear reactors, both reactor neutron displacement effects and proton displacement damage effects from natural space radiation must be considered. A new method is needed to analyze, evaluate, and assess the displacement damage from these two different radiation sources. Conventional proton equivalence methods cannot fully reflect the comprehensive radiation environment of the spacecraft, nor is there a specific method to equate the reactor neutron environment to protons. Summary of the Invention

[0006] In view of this, the present invention provides a method and system for evaluating displacement damage in a comprehensive radiation field based on equivalent dose, which can transform different environments into one environment for verification, analysis and simulation, ensuring that new spacecraft adapt to the comprehensive radiation environment in orbit.

[0007] To achieve the above objectives, the technical solution of the present invention includes the following steps:

[0008] Step 1: Analyze the reactor neutron radiation environment faced by the spacecraft to obtain the neutron differential energy spectrum at different locations; and based on the neutron differential energy spectrum, assess the neutron displacement damage dose of the nuclear reactor faced by the spacecraft.

[0009] Meanwhile, the displacement damage dose caused by natural space radiation was assessed by analyzing the natural space radiation environment.

[0010] Step 2: Add the displacement damage dose caused by natural space radiation to the neutron displacement damage dose of the nuclear reactor to obtain the total displacement damage dose under the combined radiation environment.

[0011] Step 3: Analyze the equivalent flux of displacement damage using the total displacement damage dose under the integrated radiation environment, and then assess the displacement damage resistance of the aircraft under the integrated radiation field by combining the displacement damage resistance of the equipment in the aircraft.

[0012] Step 4: Based on the aircraft's resistance to displacement damage under the integrated radiation field, adjust the layout and position of sensitive equipment on the aircraft and design local shielding. Repeat steps 1 to 3 until the aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

[0013] Furthermore, the reactor neutron radiation environment faced by the spacecraft was analyzed, and the differential neutron energy spectrum at different locations was obtained, specifically:

[0014] By combining the specific type of reactor used in the satellite, its shielding conditions, and the configuration of the spacecraft, and by clarifying the neutron radiation environment reaching the sensitive parts of the satellite, the neutron radiation environment at different locations from the reactor can be obtained, thus yielding the neutron differential energy spectrum Φ at different locations. S (E), where E represents the neutron energy.

[0015] Furthermore, based on the neutron differential energy spectrum, the neutron displacement damage dose from the nuclear reactor faced by the spacecraft was assessed, specifically:

[0016] The displacement damage dose of the neutron is calculated according to the displacement damage formula (1);

[0017]

[0018] Among them DDD反应堆 This represents the reactor neutron displacement damage dose, expressed in MeV / g; Φ S (E) represents the differential energy spectrum of neutron energy at a specific location of the spacecraft from the radiation source; NIEL(E) represents the non-ionization energy loss of neutrons with energy E, in MeV cm⁻¹. 2 / g;E max This represents the maximum neutron energy, estimated based on a real reactor.

[0019] Furthermore, the NIEL(E) value is obtained by converting the displacement damage function kerma value, where the unit of the displacement damage function kerma value is MeV-mb.

[0020] Furthermore, an analysis of the natural radiation environment in space was conducted to assess the displacement damage dose caused by natural radiation in space, specifically:

[0021] Using space environment analysis models or software, and in conjunction with the spacecraft's on-orbit mission, we analyze the natural space radiation environment it faces on-orbit. Based on the spacecraft's structure, we provide the differential energy spectrum f(E') of the shielded space particles, where E' is the energy of the space particles.

[0022] Based on the differential energy spectrum f(E') of the space particles after shielding, the displacement damage dose caused by natural space radiation is evaluated:

[0023]

[0024] Among them DDD 空间 The displacement damage dose of the space particle is expressed in MeV / g; NIEL(E') represents the non-ionization energy loss of the space particle at energy E'; f(E') represents the differential energy spectrum of the space particle; E MAX E represents the maximum energy after shielding sensitive parts of the aircraft. MIN This indicates the minimum energy required to shield sensitive parts of an aircraft.

[0025] Furthermore, the displacement damage dose caused by natural space radiation is added to the neutron displacement damage dose from the nuclear reactor to obtain the total displacement damage dose under the combined radiation environment, specifically:

[0026] DDD = DDD 反应堆 +DDD 空间 (3)

[0027] Where DDD represents the total displacement damage dose.

[0028] Furthermore, based on the total displacement damage dose under the integrated radiation environment, the equivalent flux of displacement damage is evaluated, thereby obtaining the aircraft's resistance to displacement damage under the integrated radiation field, specifically:

[0029] The formula for the equivalent flux due to displacement damage is as follows:

[0030] Φ 等效 =RDM×DDD / NIEL 等效 (4)

[0031] Where Φ 等效 Represents the equivalent displacement damage flux; RDM represents the radiation design margin; NIEL 等效 This represents the equivalent non-ionizing energy loss of the irradiation source when conducting ground displacement damage tests using neutrons, expressed in MeV cm⁻¹. 2 / g.

[0032] The resistance to displacement damage of each device in the aircraft is obtained based on actual test data.

[0033] If the equivalent flux corresponding to the displacement damage resistance of the equipment in the aircraft is not less than the result in equation (4), then the current displacement damage resistance of the equipment meets the application requirements of the integrated radiation field.

[0034] If the equivalent flux corresponding to the displacement damage resistance of the equipment in the aircraft is less than the result in equation (4), then the current displacement damage resistance of the equipment does not meet the application requirements of the integrated radiation field.

[0035] Furthermore, NIEL 等效 This represents the equivalent non-ionizing energy loss of the irradiation source when conducting ground displacement damage tests using neutrons, where:

[0036] If a monoenergetic neutron with energy E is used when conducting a ground displacement damage test, NIEL 等效 =NIEL(E); If neutrons of various energies are used when conducting ground displacement damage tests, the calculation formula is as shown in equation (5);

[0037]

[0038] Where E max E represents the maximum energy of a neutron. min This represents the minimum energy of a neutron; the value of NIEL(E) should be the same as in equation (1); Φ 归一化 (E) represents the normalized differential energy spectrum of the irradiation source for the ground displacement damage test.

[0039] Furthermore, based on the aircraft's resistance to displacement damage under the integrated radiation field, the layout and location of sensitive equipment on the aircraft are adjusted, and local shielding design is implemented. Steps 1 to 3 are repeated until the aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field, specifically including steps 401 to 404:

[0040] Step 401: If there are devices on the spacecraft whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, the layout and position of the devices shall be adjusted. Specifically, under the constraints of the satellite's own volume, the sensitive devices shall be moved away from the reactor. Then, steps 1 to 3 shall be repeated to reassess the devices' adaptability to the displacement damage environment.

[0041] Step 402: After reassessing the equipment's adaptability to displacement damage environment, if there is no equipment whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

[0042] If there are still devices whose resistance to displacement damage does not meet the application requirements of the comprehensive radiation field, and the number exceeds the set threshold, proceed to step 404; if the number does not exceed the set threshold, proceed to step 403.

[0043] Step 403: Perform local shielding design for the aircraft, and execute steps 1 to 3 again. If there are no devices whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field; if there are still devices whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then proceed to step 404.

[0044] Step 404: Conduct protective design for the aircraft and reactor, and repeat steps 1 to 4 until the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

[0045] Furthermore, another embodiment of the present invention provides a comprehensive radiation field displacement damage evaluation system based on equivalent dose, comprising the following modules:

[0046] The reactor neutron displacement damage assessment module is used to analyze the reactor neutron radiation environment faced by the spacecraft, obtain the neutron differential energy spectrum at different locations, and assess the neutron displacement damage dose of the nuclear reactor faced by the spacecraft based on the neutron differential energy spectrum.

[0047] The space natural radiation displacement damage assessment module is used to analyze the space natural radiation environment and assess the displacement damage dose caused by space natural radiation.

[0048] The total displacement damage assessment module is used to add the displacement damage dose caused by natural space radiation to the neutron displacement damage dose of the nuclear reactor to obtain the total displacement damage dose under the comprehensive radiation environment.

[0049] The displacement damage equivalent flux assessment module is used to assess the displacement damage equivalent flux based on the total displacement damage dose under the integrated radiation environment.

[0050] The aircraft displacement damage resistance assessment module is used to assess the aircraft's resistance to displacement damage under the comprehensive radiation field based on the displacement damage equivalent flux. Based on the aircraft's resistance to displacement damage under the comprehensive radiation field, the layout and location of sensitive equipment on the aircraft are adjusted and local shielding design is carried out. The reactor neutron displacement damage assessment module, the space natural radiation displacement damage assessment module, the displacement damage equivalent flux assessment module, and the aircraft displacement damage resistance assessment module are repeatedly called until the aircraft's resistance to displacement damage under the comprehensive radiation field meets the application requirements of the comprehensive radiation field.

[0051] Beneficial effects:

[0052] 1. The integrated radiation field displacement damage evaluation method based on equivalent dose provided by this invention comprehensively considers the space radiation faced by the spacecraft and the neutron radiation of the reactor, and performs consistent equivalent treatment on them. It can transform different environments into one environment for verification, analysis, and simulation, ensuring that the new spacecraft adapts to the integrated radiation environment in orbit.

[0053] 2. The comprehensive radiation field displacement damage evaluation method based on equivalent dose provided by this invention not only considers the equivalence of single-energy particles, but also takes into account the phenomenon of multiple energy particles when different irradiation sources are used on the ground, and performs equivalent evaluation on the energy spectrum of the experiment. Existing methods generally only consider the equivalence of single-energy particles, and do not provide equivalent methods for multi-energy spectra, making it impossible to compare multi-energy spectrum experiments of ground reactors; or to provide equivalence and evaluation for experiments using multiple energy particles on the ground.

[0054] 3. This invention provides a comprehensive radiation field displacement damage assessment method based on equivalent dose, along with assessment methods and further measures. It comprehensively considers reactor and space natural radiation, and proposes corresponding protective measures and procedures according to the characteristics of different equipment. Existing methods generally only consider the evaluation and protection against natural irradiation; this method considers the displacement damage assessment of the comprehensive environment and provides control measures. Attached Figure Description

[0055] Figure 1 A flowchart of the integrated radiation field displacement damage evaluation method based on equivalent dose provided by the present invention;

[0056] Figure 2 A schematic diagram of the non-ionization energy loss of particles with different energies in silicon;

[0057] Figure 3 A schematic diagram of the non-ionization energy loss of particles with different energies in gallium arsenide;

[0058] Figure 4The present invention provides a method for evaluating displacement damage in a comprehensive radiation field based on equivalent dose. Detailed Implementation

[0059] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0060] This invention provides a method for evaluating displacement damage in a comprehensive radiation field based on equivalent dose. It is primarily designed for spacecraft employing nuclear reactors, which face a combined radiation environment of natural space radiation and the nuclear reactor, and assesses displacement damage. The specific steps are detailed below. Figure 1 Specifically:

[0061] Step 1: Analyze the reactor neutron radiation environment faced by the spacecraft to obtain the neutron differential energy spectrum at different locations; and based on the neutron differential energy spectrum, assess the neutron displacement damage dose of the nuclear reactor faced by the spacecraft.

[0062] In this embodiment of the invention, the neutron radiation environment reaching sensitive parts of the satellite is determined by considering the specific type of reactor used in the satellite, its shielding conditions, and the configuration of the spacecraft. For conventional spacecraft, the shielding attenuation of neutron radiation is very small; unless specific protective measures are adopted, this attenuation needs to be considered. Simultaneously, the reactor neutron radiation environment can be approximated as a point source, attenuating with distance; therefore, environmental changes caused by the distance to the spacecraft should be considered. The neutron radiation environment differs at different distances from the reactor, and the differential neutron energy spectrum Φ at these different locations is given. s (E), E neutron energy.

[0063] The neutron displacement damage dose is calculated using the displacement damage calculation formula. The lower limit of integration is generally taken as 10 keV. NIEL(E) can be found by referring to... Figure 2 , Figure 3 choose.

[0064]

[0065] In the formula:

[0066] DDD 反应堆 The reaction is expressed as a dose of damage based on reactor neutron displacement, MeV / g;

[0067] Φ s (E) represents the differential energy spectrum of neutron energy at a specific location of the spacecraft from the radiation source;

[0068] NIEL(E) represents the neutron non-ionization energy loss with energy E, MeV cm⁻¹ 2 / g. In neutron analysis, the displacement damage function kerma value (unit: MeV-mb) is frequently used, which can be converted into the NIEL value; for example, for Si material, NIEL(E) = kerma value × 2.144 × 10-5 . Figure 2 The non-ionization energy loss of particles with different energies in silicon is shown. Figure 3 The non-ionization energy loss of particles with different energies in gallium arsenide is shown;

[0069] E max This represents the maximum neutron energy, estimated based on a real reactor.

[0070] This step also includes: analyzing the natural radiation environment in space and assessing the displacement damage dose caused by natural radiation in space.

[0071] Using space environment analysis models or software, and in conjunction with the spacecraft's on-orbit mission, we analyze the natural space radiation environment it faces on-orbit. Based on the spacecraft's structure, we provide the differential energy spectrum f(E') of the shielded space particles, where E' is the energy of the space particles.

[0072] Based on the differential energy spectrum f(E') of the space particles after shielding, the displacement damage dose caused by natural space radiation is evaluated:

[0073]

[0074] In the formula:

[0075] DDD 空间 —Displacement damage dose of space particles, MeV / g;

[0076] NIEL(E') – Non-ionization energy loss of a space particle with energy E';

[0077] f(E) — Differential energy spectrum of spatial particles;

[0078] E MAX —The maximum energy output of a spacecraft after shielding its sensitive components;

[0079] E MIN —Minimum energy required to shield sensitive parts of an aircraft.

[0080] Sensitive parts refer to parts that are sensitive to displacement damage, such as equipment on aircraft containing optoelectronic devices and transistors.

[0081] Since the displacement damage caused by space electrons is relatively small, only the displacement damage dose of protons needs to be calculated.

[0082] Step 2: Add the displacement damage dose from natural space radiation to the neutron displacement damage dose from the nuclear reactor to obtain the total displacement damage dose under the combined radiation environment, specifically:

[0083] DDD = DDD 反应堆 +DDD 空间 (3)

[0084] Where DDD represents the total displacement damage dose.

[0085] Step 3: Evaluate the equivalent flux of displacement damage based on the total displacement damage dose under the integrated radiation environment, and then obtain the aircraft's resistance to displacement damage under the integrated radiation field.

[0086] Based on the displacement damage calculation method, and combined with the experimental conditions or existing experimental data of the equipment, an analysis of the equivalent experimental dose is conducted. Under normal circumstances, neutron displacement damage is relatively large under combined radiation, so neutrons are used to conduct displacement damage tests; either monoenergetic neutrons or reactor neutron sources can be used.

[0087] The formula for the equivalent flux due to displacement damage is as follows:

[0088] Φ 等效 =RDM×DDD / NIEL 等效 (4)

[0089] In the formula:

[0090] Φ 等效 —Equivalent displacement damage flux;

[0091] RDM – Radiation Design Margin, typically selected as 2 to 3;

[0092] NIEL 等效 —Equivalent non-ionizing energy loss of the irradiation source, MeV cm 2 / g. For a monoenergetic neutron with energy E, NIEL 等效 =NIEL(E); if there are multiple energies, the calculation formula is as shown in equation (5). The value of NIEL(E) should be the same as that in equation (1).

[0093]

[0094] In the formula:

[0095] Φ 归一化 (E)——Normalized differential energy spectrum of the irradiation source. Substitute equation (5) into equation (4).

[0096] The resistance to displacement damage of each device in the aircraft was obtained based on test data.

[0097] If the equivalent flux corresponding to the equipment's resistance to displacement damage in the aircraft is not less than the result in equation (4), then the equipment's resistance to displacement damage meets the application requirements of the integrated radiation field, indicating that the equipment can be used.

[0098] If the equivalent flux corresponding to the equipment's resistance to displacement damage in the aircraft is less than the result in equation (4), then the equipment's resistance to displacement damage does not meet the application requirements of the integrated radiation field, indicating that the equipment cannot be used.

[0099] Step 4: Based on the aircraft's resistance to displacement damage under the integrated radiation field, adjust the layout and position of sensitive equipment on the aircraft and design local shielding. Repeat steps 1 to 3 until the aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

[0100] Step 4 specifically includes steps 401 to 404:

[0101] Step 401: If there are devices on the spacecraft whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, the layout and position of the devices shall be adjusted. Specifically, under the constraints of the satellite's own volume, the sensitive devices shall be moved away from the reactor. Then, steps 1 to 3 shall be repeated to reassess the devices' adaptability to the displacement damage environment.

[0102] Step 402: After reassessing the equipment's adaptability to displacement damage environment, if there is no equipment whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

[0103] If there are still devices whose resistance to displacement damage does not meet the application requirements of the comprehensive radiation field, and the number exceeds the set threshold, proceed to step 404; if the number does not exceed the set threshold, proceed to step 403.

[0104] Step 403: Perform local shielding design for the aircraft, and execute steps 1 to 3 again. If there are no devices whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field; if there are still devices whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then proceed to step 404.

[0105] Step 404: Conduct protective design for the aircraft and reactor, and repeat steps 1 to 4 until the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

[0106] Another embodiment of the present invention provides a comprehensive radiation field displacement damage evaluation system based on equivalent dose, such as... Figure 4 As shown, it includes the following modules:

[0107] The reactor neutron displacement damage assessment module is used to analyze the reactor neutron radiation environment faced by the spacecraft, obtain the neutron differential energy spectrum at different locations, and assess the neutron displacement damage dose of the nuclear reactor faced by the spacecraft based on the neutron differential energy spectrum. Specifically, it can be performed according to the reactor neutron displacement damage assessment steps described in step 1.

[0108] The space natural radiation displacement damage assessment module is used to analyze the space natural radiation environment and assess the displacement damage dose caused by space natural radiation. Specifically, it can be performed according to the space natural radiation displacement damage assessment steps described in step 1.

[0109] The total displacement damage assessment module is used to add the displacement damage dose from natural space radiation to the neutron displacement damage dose from the nuclear reactor to obtain the total displacement damage dose under the combined radiation environment. Specifically, it can be performed according to the total displacement damage dose method described in step 2.

[0110] The displacement damage equivalent flux assessment module is used to assess the displacement damage equivalent flux based on the total displacement damage dose under the integrated radiation environment and the displacement damage resistance of the equipment in the aircraft. Specifically, it can be performed according to the method described in step 3.

[0111] The aircraft displacement damage resistance assessment module is used to assess the aircraft's resistance to displacement damage under the integrated radiation field based on the displacement damage equivalent flux. Based on the aircraft's resistance to displacement damage under the integrated radiation field, the layout and location of sensitive equipment on the aircraft are adjusted, and local shielding designs are implemented. The reactor neutron displacement damage assessment module, the space natural radiation displacement damage assessment module, the displacement damage equivalent flux assessment module, and the aircraft displacement damage resistance assessment module are repeatedly called until the aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field. Specifically, the method described in step 4 can be followed, where steps 1, 2, and 3 involve calling the corresponding modules.

[0112] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A comprehensive radiation field displacement damage evaluation method based on equivalent dose, characterized in that, Includes the following steps: Step 1: Analyze the reactor neutron radiation environment faced by the spacecraft to obtain the differential neutron energy spectrum at different locations, specifically: By combining the specific type of reactor used in the satellite, its shielding conditions, and the configuration of the spacecraft, and by clarifying the neutron radiation environment reaching the sensitive parts of the satellite, the neutron radiation environment at different locations from the reactor can be obtained, thus yielding the neutron differential energy spectrum at different locations. Φ S ( E ),in E Represents neutron energy; Based on the neutron differential energy spectrum, the neutron displacement damage dose from the nuclear reactor faced by the spacecraft was assessed, specifically as follows: The displacement damage dose of the neutron is calculated according to the displacement damage formula (1); （1） in This indicates the reactor neutron displacement damage dose, expressed in MeV / g. Φ S ( E This represents the differential energy spectrum of neutron energies at a specific location of the spacecraft from the radiation source; NIEL ( E () represents the non-ionization energy loss of a neutron with energy E, expressed in MeV cm⁻¹. 2 / g; E max This represents the maximum neutron energy, estimated based on a real reactor. Simultaneously, an analysis of the natural radiation environment in space was conducted to assess the displacement damage dose caused by natural radiation in space, specifically: Using space environment analysis models or software, and considering the spacecraft's on-orbit mission, we analyze the natural space radiation environment it faces in orbit, and, based on the spacecraft's structure, provide the differential energy spectrum of space particles after shielding. , E’ Energy of space particles; Based on the differential energy spectrum of space particles after shielding The displacement damage dose caused by natural space radiation was assessed. （2） in This represents the displacement damage dose of space particles, expressed in MeV / g. NIEL ( E’ ) represents energy E ’ Space particle non-ionization energy loss; Represents the differential energy spectrum of spatial particles; E MAX This indicates the maximum energy after shielding sensitive parts of the aircraft. E MIN This indicates the minimum energy required to shield sensitive parts of an aircraft. Step 2: Add the displacement damage dose caused by natural space radiation to the neutron displacement damage dose of the nuclear reactor to obtain the total displacement damage dose under the combined radiation environment; Step 3: Utilize the total displacement damage dose under the integrated radiation environment to assess the equivalent flux of displacement damage, and then combine this with the displacement damage resistance of equipment in the aircraft to assess the aircraft's resistance to displacement damage under the integrated radiation field. Step 4: Based on the aircraft's resistance to displacement damage under the integrated radiation field, adjust the layout and position of sensitive equipment on the aircraft and design local shielding. Repeat steps 1 to 3 until the aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field. Specifically, this includes steps 401 to 404: Step 401: If there are devices on the spacecraft whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, the layout and position of the devices shall be adjusted. Specifically, under the constraints of the satellite's own volume, the sensitive devices shall be moved away from the reactor. Then, steps 1 to 3 shall be repeated to re-evaluate the devices' adaptability to the displacement damage environment. Step 402: After reassessing the equipment's adaptability to displacement damage environment, if there is no equipment whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field. If there are still devices whose resistance to displacement damage does not meet the application requirements of the comprehensive radiation field, and the number exceeds the set threshold, proceed to step 404; if the number does not exceed the set threshold, proceed to step 403. Step 403: Perform local shielding design for the aircraft, and execute steps 1 to 3 again. If there are no devices whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field; if there are still devices whose resistance to displacement damage does not meet the application requirements of the integrated radiation field, then proceed to step 404. Step 404: Conduct protective design for the aircraft and reactor, and repeat steps 1 to 4 until the designed aircraft's resistance to displacement damage under the integrated radiation field meets the application requirements of the integrated radiation field.

2. The method for evaluating displacement damage in a comprehensive radiation field based on equivalent dose as described in claim 1, characterized in that, The total displacement damage dose under the comprehensive radiation environment is specifically as follows: DDD= DDD 反应堆 + DDD 空间 （3） in DDD This represents the total displacement damage dose.

3. The method for evaluating displacement damage in a comprehensive radiation field based on equivalent dose as described in claim 2, characterized in that, The displacement damage equivalent flux is evaluated based on the total displacement damage measurement under the integrated radiation environment, thereby obtaining the aircraft's resistance to displacement damage under the integrated radiation field, specifically as follows: The formula for the equivalent flux due to displacement damage is as follows: （4） in Represents the equivalent displacement damage flux; RDM represents the radiation design margin; NIEL 等效 This represents the equivalent non-ionizing energy loss of the irradiation source when conducting ground displacement damage tests using neutrons, expressed in MeV cm⁻¹. 2 / g; The resistance to displacement damage of each device in the aircraft was obtained based on test data; If the equivalent flux corresponding to the equipment's resistance to displacement damage in the aircraft is not less than the result in equation (4), then the equipment's resistance to displacement damage meets the application requirements of the integrated radiation field. If the equivalent flux corresponding to the equipment's resistance to displacement damage in the aircraft is less than the result in equation (4), then the current equipment's resistance to displacement damage does not meet the application requirements of the integrated radiation field.

4. The method for evaluating displacement damage in a comprehensive radiation field based on equivalent dose as described in claim 3, characterized in that, NIEL 等效 This represents the equivalent non-ionizing energy loss of the irradiation source when conducting ground displacement damage tests using neutrons, where: If a ground displacement damage test is conducted, an energy of [energy value missing] is used. E monoenergetic neutrons, NIEL 等效 =NIEL(E); If neutrons of various energies are used when conducting ground displacement damage tests, the calculation formula is as shown in equation (5); （5） in E max This represents the maximum energy of a neutron; E min This represents the minimum neutron energy; the value of NIEL(E) should be the same as that in equation (1); This represents the normalized differential energy spectrum of the irradiation source for the ground displacement damage test.

5. A comprehensive radiation field displacement damage evaluation system based on equivalent dose, characterized in that, The method for evaluating displacement damage in a comprehensive radiation field based on equivalent dose as described in any one of claims 1 to 4 includes the following modules: The reactor neutron displacement damage assessment module is used to analyze the reactor neutron radiation environment faced by the spacecraft, obtain the neutron differential energy spectrum at different locations, and assess the neutron displacement damage dose of the nuclear reactor faced by the spacecraft based on the neutron differential energy spectrum. The space natural radiation displacement damage assessment module is used to analyze the space natural radiation environment and assess the displacement damage dose caused by space natural radiation. The total displacement damage assessment module is used to add the displacement damage dose caused by natural space radiation to the neutron displacement damage dose of the nuclear reactor to obtain the total displacement damage dose under the comprehensive radiation environment. The displacement damage equivalent flux assessment module is used to assess the displacement damage equivalent flux based on the total displacement damage dose under the integrated radiation environment. The aircraft displacement damage resistance assessment module is used to assess the aircraft's resistance to displacement damage under the comprehensive radiation field based on the displacement damage equivalent flux and the displacement damage resistance of the equipment in the aircraft. According to the aircraft's resistance to displacement damage under the comprehensive radiation field, the layout and position of sensitive equipment on the aircraft are adjusted and local shielding design is carried out. The reactor neutron displacement damage assessment module, the space natural radiation displacement damage assessment module, the displacement damage equivalent flux assessment module, and the aircraft displacement damage resistance assessment module are repeatedly called until the aircraft's resistance to displacement damage under the comprehensive radiation field meets the application requirements of the comprehensive radiation field.

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