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Nordion (NDZ) rose Monday after news that Sterigenics acquired the isotope supplier for $727 million. The deal is for $11.75 a share; Nordion closed at $11.53 on Monday. Nordion is one of the world's leading producers of molybdenum-99, an isotope used for medical imaging. The stock closed up 10.76% to $11.53, up $1.12 from its previous close of $10.41, on Monday. More than 29 million shares changed hands, more than 10 times its average volume of 254,277. The stock hit a low of $11.50 for the day and holds a one-year low of $6.56.