>What is the current status on Radioactive decay halos ?
There is a short but fairly thorough discussion and refutation of Gentry's
arguments concerning Polonium halos in "Science and Earth History: The
Evolution/Creation Controversy" by Arthur Strahler (1987, p.138-140).
This is certainly not up to date, but a good place to start.
Keith B. Miller
Department of Geology
Kansas State University
Manhattan, KS 66506