الوصفAEC-70-8900. Filter packs are removed from a water sampling cannister by the AEC’s Argonne National Laboratory research team. Water from Lake Michigan is circulated through the filters trapping microscopic particles of matter. Those are analysed at Argonne, near Chicago, Illinois, to determine if measurable amounts of radioactivity have found their way into the lake from a nuclear power generating plant. Credit: Argonne National Laboratory
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