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To build the new ion device, Monroe and his colleagues used conventional microchip-fabrication methods to first deposit layers of the semiconductor compounds gallium arsenide and aluminum gallium arsenide onto a gallium arsenide wafer. Three substances for which there were no previous IARC evaluations have now been evaluated and classified: gallium arsenide is classified as a Group I human carcinogen, indium phosphide as a Group 2A (probable) human carcinogen, and vanadium pentoxide as a Group 2B (possible) human carcinogen (IARC, in press a). Los Angeles-area manufacturers pioneering the use of a space-age compound called gallium arsenide have received another boost, as an Orange County corporate-investment firm announced it expects by January to buy out the top producer of solar cells made from gallium arsenide, citing its promising "growth potential. |
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