In nuclear energy: a radioactive source which is not under regulatory control, either because it has never been under regulatory control or because it has been abandoned, lost, misplaced, stole, or transferred without proper authorization [Section 5(ee), Philippine National Nuclear Energy Safety Act of 2025]
Note: The term is alternatively referred to as Material Out of Regulatory Control (MORC) [Section 5(ee), Philippine National Nuclear Energy Safety Act of 2025].