24 Mar OPG’s Darlington Nuclear Unit 4 Now Producing Cobalt-60
February 24, 2026 – As part of our long-term investment initiatives, Nordion is supporting refurbishment projects at Ontario reactors producing Cobalt-60. Ontario Power Generation (OPG) is a longstanding supply partner with significant expertise in the execution of complex nuclear projects. OPG and Nordion are working on expanding production of Cobalt-60 to OPG’s Darlington Nuclear Generating Station (DNGS).
We’re happy to share that the Unit 4 reactor at DNGS has been successfully refurbished. Darlington’s new supply of Cobalt-60 will be harvested after three years of activation in the Unit 4 reactor, then delivered to Nordion to be packaged and distributed to gamma sterilization facilities worldwide.
For decades, Ontario’s CANDU reactors and their production of Cobalt-60 have helped ensure a better quality of life for millions around the world. Riaz Bandali, President of Nordion, shares, “Cobalt-60 is essential to the safety of the healthcare industry and to our mission of Safeguarding Global Health®. OPG has been a trusted partner in this mission for more than 50 years, and we are proud of what we have accomplished together at Darlington.”