That depends on how many gamma rays you're dealing with. Its just stochastics. A certain fraction will allways get through. All the shielding does is to reduce the likelihood for each one. So even 1 m solid lead won't reduce radiation to unmeasurable levels if there's enough of it inside.
________________________________ Jed Rothwell wrote: Jones Beene <jone...@pacbell.net> wrote: You simply CANNOT shield this kind of gamma radiation well with lead. Some always escapes. That is what experts in radiation say. Actually, you could stop them with enough lead. I believe it takes ~10 cm. If you had 1 m there would be no measurable radiation on the other side.
