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Method for analyzing total dose effect generated by isotope heat source

A technology of total dose effect and analysis method, which is applied in the field of analysis of total dose effect produced by isotope heat sources, can solve problems such as complex nuclear reaction process, difficulty in establishing theoretical models, difficulty in evaluating the impact of spacecraft total dose effect, etc., and save test funds and radiation risks, avoiding the effects of trial monitoring

Active Publication Date: 2019-11-15
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

The nuclear reaction process is very complicated, so it is very difficult to evaluate the impact of isotope nuclear sources on the total dose effect of spacecraft, and it is difficult to establish an accurate theoretical model

Method used

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  • Method for analyzing total dose effect generated by isotope heat source
  • Method for analyzing total dose effect generated by isotope heat source
  • Method for analyzing total dose effect generated by isotope heat source

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Embodiment

[0043] Step (1), obtaining the total dose value of gamma rays under different shielding materials of the shielding body. The narrow-beam model is used for estimation. The weakening of single-energy γ-rays in substances follows the exponential law. The dose calculation formula of multiple single-energy γ-rays emitted by isotopes after shielding is as follows:

[0044]

[0045] Among them: D is the absorbed dose of the semiconductor device receiving radiation, the unit is Gy; μen / ρ en is the mass-energy absorption coefficient of the effector, in cm 2 g -1 ; 0 is the total particle flux emitted by the radioactive source, in cm -2 ; k i is the absolute intensity of the i-th γ-ray emitted by the isotope heat source, which refers to the ratio of the number of emitted ray when 100 parent nuclei decay, dimensionless, and the unit is %; m is the type of γ-ray; E i is the energy of the i-th γ-ray, the unit is MeV; n is the number of layers of shielding material; (μ / ρ) i,j is t...

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Abstract

The invention discloses a method for analyzing the total dose effect generated by an isotope heat source, thereby solving a problem that the total dose-year spectrum generated by gamma rays of an isotope power source cannot be obtained at present. With an established model, a total dose spectrum being a total dose-year relationship generated by gamma rays in actual application can be obtained by backstepping according to specific packaging materials, isotopic nuclear fuel mass, and a distance to the central distance of the isotope nuclear fuel, so that the total dose effect risk of the spacecraft during the whole task period is estimated. The isotope power source is estimated by the model, so that the testing and monitoring of the isotope radioactive fuel are avoided. The method is simpleand is easy to implement; the test expenses and radiation risk are saved; and the method has the certain economic significance and guiding significance in engineering design. According to the invention, the method not only is involved in the isotope power source of nuclear decay but also is suitable for a nuclear reactor source of nuclear fission, thereby realizing evaluation of the total dose effect generated by the nuclear power supply in space nuclear power spacecraft. The method has the certain universality.

Description

technical field [0001] The invention belongs to the technical field of nuclear radiation in the overall design of spacecraft, and in particular relates to an analysis method for the total dose effect produced by an isotope heat source. Background technique [0002] In deep space exploration missions, the use of traditional solar energy is difficult due to the lunar nights that last 14 Earth days on the moon, the daily sandstorms on Mars, and the low light intensity in the deep space beyond Jupiter. The use of space nuclear energy is a better solution to the energy problem of spacecraft. choose. [0003] Space is filled with all kinds of particles from the vast universe: protons, electrons, alpha particles, heavy ions, gamma rays, etc. There are two main types of nuclear energy used in space, one is nuclear decay energy (plutonium-238), and the other is nuclear fission energy (uranium-235). The radioisotope heat source uses the radioisotope plutonium-238 (Pu-238), which has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/02
CPCG01T1/026
Inventor 王颖朱安文田岱邱家稳李衍存张弘刘飞标马继楠张文佳马彬苏生
Owner BEIJING INST OF SPACECRAFT SYST ENG
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