The Non–equilibrium Statistical Model Of Particles Irradiation And Application

Particle irradiation plays an important role in the field of material irradiation damage.So far,many related theories about irradiation process have been established and a lot of experiments have been carried out.In this paper,the statistical theoretical research method of pattern growth in solid materials is adopted and a non-equilibrium statistical model of particles irradiation process is established.In this model,the microstructural background fluctuation in the material is considered as the main reason for the change of the penetration rate of the injected particles.On the basis of this reason,the particles penetration growth rate function and penetration depth probability density function are derived.Then,the evolution of the defects in the irradiation process and the effect of the defects on the properties of the materials are studied.In the space irradiated environment,the research on the properties of Kapton film has been a hot issue in recent years.So,in this paper,protons irradiated Kapton film is taken as an example.According to the different action mechanism of high energy particles(Protons irradiation in the Earth's radiation band is mainly considered.)and low energy particles with the material,the probability density function of the penetration depth of high energy protons and low energy protons are calculated respectively.It is found that the product of the most probable penetration depth of high-energy protons and its corresponding maximum probability density is a fixed value;but with the increasing of the energy of the low energy proton,the product of the most probable penetration depth of low-energy protons and its corresponding maximum probability density is gradually reduced to a certain value;by contrast,we know that the energy demarcation line between high-energy protons and low-energy protons is about10~5 e V;high energy incident protons have greater damage to materials and the ionization process is faster than the displacement process;the evolution process of defects in thin films is analyzed from microscopic mechanism;by comparing the penetration depth of protons,we can only consider the ionization process when high energy protons incident,and only consider the displacement process when low energy protons incident.Besides,the study on the biological effects caused by low energy ions implant to plant seeds is also a hot pot in the field of ion breeding.In this paper,a biological target model is established by analyzing the microstructure of the loose pores in the plant seeds.According to the non-equilibrium statistical theory model of low-energy ions irradiation,the average penetration depth of nitrogen ions with the energy of 30 ke V implanted into brown rice is calculated and the average penetration depth of nitrogen ions is on the order of microns.By comparing the impact of the void volume on the penetration depth,we found that the larger the void volume,the greater the penetration depth of nitrogen ions.Due to the changes of the microstructure in the seeds,the average penetration depth of nitrogen ions fluctuates in a certain range.