abstract:A lead castle, also called a lead cave or a lead housing, is a structure composed of lead to provide shielding against gamma radiation in a variety of applications in the nuclear industry and other activities which use ionizing radiation.
Using Firefly again as an example, the biggest impediment stopping that show from returning in some form is the fact that many of its lead actors are starring in their own popular projects right now, Nathan Fillion in Castle, Morena Baccarin in Homeland, and so on.
