To be able to respond effectively to any radiological or nuclear emergency, a radiation accident registry is a valuable asset. This type of registry is able to assist responders in preparing for and managing situations during the event and in providing effective follow-up on the long-term health effects of persons exposed. It is especially important to register radiation-exposed people in vulnerable population groups, such as children and pregnant women, to ensure proper long-term health care and protection. As part of its national system of emergency preparedness for response to radiological or nuclear events, Canada needs to develop a plan for a radiation accident registry. Apart from radiation dose information, this registry should also contain a sub-database of available medical facilities and necessary supplies as well as professionals specialising in radiation treatment and protection. Following the establishment of the registry, it should routinely be tested in training exercises to ensure its readiness for implementation whenever the need might arise.