WALTHAM, Mass., March 29 -- Thermo Electron announced today it has purchased Niton LLC for approximately $40.5 million in cash, subject to a post-closing adjustment. Niton, based in Billerica, Mass., is a provider of portable x-ray analyzers for the metals, petrochemical and environmental markets, with revenues of $36 million in 2004. Marijn E. Dekkers, president and CEO of Thermo Electron, said, "The addition of Niton is a continuation of our strategy to acquire companies that extend our capabilities so we can better serve the emerging needs of our customers. 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