Some articles on biological shields, biological shield:
... of the reactor pit serve as additional biological shields ... The top of the reactor is covered by the upper biological shield, also called "Schema E", Pyatachok, or, after the explosion (of Chernobyl Reactor 4), Elena, a 3 m (9 ft 10 in) thick ... Below the bottom of the reactor core there is the lower biological shield, similar to the UBS, but only 14.5 m (47 ft 7 in) in diameter and 2 m (6 ft 7 in) thick ...
Famous quotes containing the words shield and/or biological:
“The lichen on the rocks is a rude and simple shield which beginning and imperfect Nature suspended there. Still hangs her wrinkled trophy.”
—Henry David Thoreau (18171862)
“Biological possibility and desire are not the same as biological need. Women have childbearing equipment. For them to choose not to use the equipment is no more blocking what is instinctive than it is for a man who, muscles or no, chooses not to be a weightlifter.”
—Betty Rollin (b. 1936)