Simulation of lutetium metal evaporation considering atomic metastable state

Lutetium-177, one of the current global research hotspots for medical isotopes, can be produced by reactor irradiation lutetium-176, which and processed with assistance electron beam physical vapor deposition (EB-PVD). The metal evaporation process is an important part EB-PVD, aims to convert solid into atomic vapor. distribution each macroscopic characteristic quantity such as thermal population distribution, density velocity temperature will directly affect utilization atoms subsequent coating process. In this paper, two-dimensional three-dimensional models are established based on direct simulation Monte Carlo method (DSMC), metastable state introduced collision assumption. quantities number vapor, motion discrete degree total in process24 or without considering lutetium analyzed compared, spatial characteristics energy level observed, variation at center slit opening size source surface discussed. results study show that passing through flow device decreases, average x- z-directions increase after state. intensifies transformation changes parameters At same time, trigger including anomalous protrusion above slit. model consistent order magnitude data pattern, serve a reference guide experimental