Mirion Technologies (MIR) said Tuesday it plans to offer $300 million worth of convertible senior notes due 2030 through a private placement.

Initial buyers will be granted a 13-day option to buy up to an additional $45 million of the notes, the company said.

Net proceeds will likely be used to repay $250 million of outstanding term loans and to buy back up to $50 million of the company's Class A common shares, among other purposes, Mirion Technologies said.

The company's shares were down more than 3% in recent Tuesday premarket activity.