U.S. radiation detection and monitoring equipment company Mirion Technologies Inc. is proposing a new credit facility to refinance its existing debt. We are assigning the company a preliminary 'B' corporate credit rating. We are also assigning our 'B' preliminary issue-level rating to the company's proposed senior secured credit facilities, including a $25 million revolving credit facility and a $200 million first-lien term loan, with a preliminary '3' recovery rating. The outlook is stable, reflecting our expectations for the company to operate within credit measures commensurate for the rating. NEW YORK (Standard&Poor's) March 9, 2012--Standard&Poor's Ratings Services said today that it assigned its 'B' preliminary corporate credit rating to San Ramon, Calif.-based Mirion Technologies, Inc. (Mirion). At