The radiation shielding used by AST™ in the "In-home Family Survival Room" is the exact same material that is used in the hospital x-ray rooms in the U.S.
The shielding is put up over the existing walls and the then covered by new drywall
Bi-fold shutters with the shielding attached, are completely hidden behind the window drapes until needed.
Simply close both sides of the shutters and they form a complete radiation shield over the window area.