There's an excellent blog out there called Thrilling Wonder Stories. In September it carried a review of Bradbury's "Kaleidoscope", as adapted for the 1950s radio series Dimension X by George Lefferts. It also includes the episode for you to listen to.
In many ways, "Kaleidoscope" is an ideal piece for radio drama, as its impact can be carried largely through the use of voice and the odd sound effect. The story involves astronauts who become physically isolated from other, and the sense of isolation can work well on radio... which is perhaps why "Kaleidoscope" has been adaptedly repeatedly for the medium. Check out my log of Bradbury radio adaptations and see how often it appears.