Abstract: The migration of point defects under irradiation is a typical stochastic process. This paper systematically investigates the sink strength of point defects absorbed by voids and grain boundaries based on classical diffusion theory and the Object Kinetic Monte Carlo (OKMC) method. By integrating theoretical derivation with numerical simulation, the study facilitates a deeper understanding of concepts such as stochastic process, statistical error, and the Monte Carlo method. It also broadens the perspective on applying computational physics to complex physical system modeling, and contributes to the development of students skills in comprehensive analysis and computational practice.

Key words: sink strength, object kinetic Monte Carlo, stochastic process, computational physics