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#6436 |
legend
Join Date: Oct 2006
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Beryllium has a low thermal neutron absorption, which is why, it is commonly used as a reflector or moderator in nuclear reactors.
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#6437 |
legend
Join Date: Oct 2006
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It is mixed with an alpha emitter such as polonium 210, radium 226 or actinium 227, and used in neutron sources.
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#6438 |
legend
Join Date: Oct 2006
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It is also used in the pipes of various high energy particle physics experiments, such as the Large Hadron Collider.
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#6439 |
legend
Join Date: Oct 2006
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The oxide of beryllium is an excellent heat conductor as well as a good electrical insulator.
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#6440 |
legend
Join Date: Oct 2006
Location: Independence, MO
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It is often used as an insulator base plate, in high power transistors for telecommunication purposes.
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#6441 |
legend
Join Date: Oct 2006
Location: Independence, MO
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beryllium (bərĭl`ēəm)
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#6442 |
legend
Join Date: Oct 2006
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[from beryl ], metallic chemical element; symbol Be;
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#6443 |
legend
Join Date: Oct 2006
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at. no. 4; at. wt. 9.01218; m.p. about 1,278°C;; b.p. 2,970°C; (estimated); sp. gr. 1.85 at 20°C;; valence +2. Beryllium is a strong, extremely light, high-melting, silver-gray metal with a close-packed hexagonal crystalline structure. It is an alkaline-earth metal in Group 2 of the periodic table.
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#6444 |
legend
Join Date: Oct 2006
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Beryllium is resistant to corrosion; weight for weight, it is stronger than steel, and because of its low density (about 1/3 that of aluminum) it has found extensive use in the aerospace industry.
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#6445 |
legend
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Beryllium is soluble in hot nitric acid, dilute hydrochloric and sulfuric acids, and sodium hydroxide.
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#6446 |
legend
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Like aluminum and magnesium, which it resembles chemically, it readily forms compounds with other elements; it is not found free in nature.
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#6447 |
legend
Join Date: Oct 2006
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However, like aluminum, it is resistant to oxidation in air, even at a red heat; it is thought to form a protective oxide film that prevents further oxidation.
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#6448 |
legend
Join Date: Oct 2006
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The compounds of beryllium are sweet-tasting and highly toxic; this toxicity has limited the use of beryllium as a rocket fuel, even though it yields more heat on combustion for its weight than any other element.
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#6449 |
legend
Join Date: Oct 2006
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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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#6450 |
legend
Join Date: Oct 2006
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The addition of 2% to 3% of beryllium to copper makes a nonmagnetic alloy six times stronger than pure copper.
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