Exceptional high-performance shielding properties of diatomite and mordenite for neutrons.

Abstract

Diatomite contains significant hydrogen in the form of silanol groups that are stable up to 700 degrees centigrade and mordenite also contains hydrogen as zeolitic water. For this reason both these rocks have high shielding efficiency for neutrons. Because of its high porosity, the properties of these natural radioprotective materials can easily be modified by the absorption of other elements or chemical compounds that are not harmful to human beings and life. These are lightweight, with a specific gravity of about 1.24, nearly half the value of normal concrete, 2.36. Results of irradiation experiments are promising, showing that these materials have twice the shielding power of normal concrete for neutrons at same packing density, in addition to being lightweight.