GS Acquisition Holdings Corp. II (NYSE:GSAH), a blank-check company backed by Goldman Sachs Group Inc. is in advanced talks to buy a nuclear measurement and analytics company from Charterhouse Capital Partners, according to people familiar with the matter. GS Acquisition a special purpose acquisition company launched about a year ago, could reach an agreement to acquire Mirion Technologies Inc. as soon as this week, the people said.

The deal could value the company at about $2.5 billion, the people said, asking not to be identified discussing confidential information. Negotiations are ongoing, and talks with the SPAC could still drag on longer or fall apart, the people said. Representatives for Charterhouse and Goldman Sachs declined to comment.