Anyone try refracting gammas with a prism? The French are doing it. See: http://www.ill.eu/news-events/press-room/press-releases/gamma-ray-optics-a-viable-tool-for-a-new-branch-of-scientific-discovery-02052012/ Not sure how it works, but others (e.g., LBL) have worked on focusing x-rays. I suspect the angles are small. Joel I. Cehn, CHP joelc at alum.wpi.edu