Charterhouse Said to Buy Mirion From American Capital

Charterhouse Capital Partners, a U.K. private-equity firm, has agreed to buy Mirion Technologies Inc. from American Capital Ltd. for about $500 million, according to two people familiar with the matter.

Mirion, a U.S. maker of radiation detection products used in the nuclear, military and medical industries, has sales of close to $300 million, said one of the people, who asked not to be identified because the talks are private.

Charterhouse declined to comment, and Mirion and American Capital didn’t immediately respond to e-mail requests seeking comment.

Mirion competes with companies such as Canberra, a unit of French nuclear reactor maker Areva SA. Areva had agreed to sell Canberra to French private-equity firm Astorg Partners, which abandoned the purchase in 2013, citing a lack of adequate financing.

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