Synchrotron X-ray topographic study of dislocations in GaAs detector crystals grown by vertical gradient freeze technique. Tuomi, T; Juvonen, M; Rantamaki, R; Hjelt, K; Bavdaz, M; Nenonen, S; Gagliardi, M.-A; McNally, P.J; Danilewsky, A.N; Prieur, E; Taskinen, M; Tuominen, M. Materials Research Society Symposium – Proceedings 1998