A model for the capture of positrons was investigated, and an expression was obtained - for the probability of positron capture by dislocations - by solving a diffusion equation. This model was more exact than others previously reported, and justified the introduction of a capture term into the model via the boundary conditions.

Capture of Positrons by Dislocations in Metals - Diffusion Model. Y.Park: Metallurgical and Materials Transactions A, 2001, 32[5], 1157-60