A subsidiary company of Rolls-Royce is facing legal action over alleged radiation safety failings.
The charges relate to how risks of radiation exposure were managed by Rolls-Royce Marine Power Operations at its site in Sinfin Lane, Derby.
The Health and Safety Executive (HSE) said employees may have been exposed to ionising radiation from sources used in industrial radiography.
The company is due before Derby Magistrates' Court on Thursday.
David Orr, HSE specialist inspector, said: "Having concluded our joint investigation with the Environment Agency into the incident we have decided there is sufficient evidence and it is in the public interest to bring criminal proceedings in this case."
A Rolls-Royce Marine Power Operations' spokeswoman said it would be "inappropriate to comment" on the proceedings.