Can a prism seperate radio waves and gamma rays in the same way that
it seperates visible light?

Technically, a prism is just a piece of glass or plastic, or even a
raindrop, that refracts, or bends, light waves as they pass through
it.  Light waves of any spectrum will bend in different amount as they
travel out of one substance and into another.  The prism effect most
people are familiar with is caused by the bend in visible light waves
as the air-to-glass transition easily bends different colors different
amounts. After bouncing off the back of the prism, the bent light
exists the prism and reenters the air, bending further. The separation
of colors are more readily distinguished with increased distance from
the prism.  Just as glass transmits visible light, most objects offer
little resistance to gamma rays.  Radio also finds its ways through
glass and many other surfaces.  Just like light of any frequency, they
both will refract when crossing boundaries, but the amount will be
negligible, unless a prism or a suitable material is devised for the
specific wavelengths you wish to separate.

One problem with making optics for short wavelengths (x-rays, gamma
rays, etc.) is that the wavelengths are similar in size to atoms, so
you get a lot of diffraction from the atomic lattice.  This is not an
issue with visible light optics, as visible wavelengths are much
larger than atoms and atomic spacings.

Yes! a prism can seperate radio waves and gamma rays in the same way that
it seperates visible light. 
 But the real problem is that we have not yet prepared any optical
instrument for the short wave-lengths like the gamma rays.
This is becouse in making this instruments, the short-wavelengths are
similar to size of atoms, so in this case we get great diffraction
(from the atomic lattice).This waves i.e. gamma rays & radio waves get
little resistance hrough various objects.But objects with the help of
nanotechnology can give a significant resistance to these waves.
 But in case of the visible light - the wavelengths are too large than
the atoms.so we do not get large diffraction here.
 But the optical instruments which can seperate short-wavelenth rays
can be prepared with the help of the newly developing
Nanotechnology.The work is out to be done but its possible.We here in
Nanontechnology the atomic spacing are too large and its solves our
present problem.
  But at pesent we cannot seperate radio waves and gamma rays with the
help of gamma prism.We have to wait for it now.It can really create
miracles if we prepare such prism in he field of communicaion and
energy.