Examining radiohalos
Brown, RH; Coffin, HG; Gibson, LJ; Roth, AA; Webster, CL. 1988.  Origins-GRI 15(1):32-38. CELD ID 2739

Abstract
This book is an account of Robert Gentry's efforts to defend creation, particularly his model of creation. The author has spent many years studying and promoting pleochroic halos [microscopic rings in rocks formed by radioactive decay in the center of the ring] as evidence of instantaneous creation. His hard work and commitment are commendable.