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In this April 3, 2017, file photo, students walk past the "Great Dome" atop Building 10 on the Massachusetts Institute of Technology campus in Cambridge, Mass. The Massachusetts Department of Public Health said in an Oct. 17, 2019, letter provided to The Associated Press, that it has opened an investigation into "radiation safety and compliance" at the university's Bates Research and Engineering Center in Middleton, Mass. (AP Photo/Charles Krupa, File)

In this April 3, 2017, file photo, students walk past the "Great Dome" atop Building 10 on the Massachusetts Institute of Technology campus in Cambridge, Mass. The Massachusetts Department of Public Health said in an Oct. 17, 2019, letter provided to The Associated Press, that it has opened an investigation into "radiation safety and compliance" at the university's Bates Research and Engineering Center in Middleton, Mass. (AP Photo/Charles Krupa, File)

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