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Beryllium transmits X rays much better than glass or other metals; this property, together with its high melting point, makes it desirable as a window material for high-intensity X-ray tubes. Because beryllium resists attack by liquid sodium metal, it is employed in cooling systems of nuclear reactors that use liquid sodium as the heat-transfer material; because it is a good reflector and absorber of neutrons, it is also used as a shield and as a moderator in nuclear reactors.
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