It features a scene with Heisenberg and another young German nuclear scientist after the war. The young scientist asks Heisenberg how much uranium it would take to make a nuclear weapon. Heisenberg answers "About ten kilos". The young man says, "But you told them it would take much more..? Heisenberg looks at the young man and shrugs his shoulders. The implication is that Heisenberg intentionally mislead the Nazis to divert them from developing the nuclear bomb. That is all I can remember from this movie, but it is stuck in my head like a nasty worm. Only the IMDb v2.0 can save me from eternal torment.
Thanks guys, I will check it out. I think the movie I am looking for included a scene with Lise Meitzner calculating the energy released by the fission of uranium into barium. It was a moving piece of work.