The $11.75 per share take-private deal represented a 12 per cent premium to Nordion’s closing price on the New York Stock Exchange on Thursday.
Nordion is one of the world’s main producers of isotope molybdenum-99, which is used in medical imaging devices.
GTCR bought Sterigenics from fellow buyout house Silverfleet Capital for $675m in 2011.
Silverfleet had hoped it might raise as much as $800m when it called in JPMorgan to arrange the sale in September 2010.
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