Nuclear medicine Nuclear medicine involves a technique using a radioactive substance to produce diagnostic images of the body or treat diseases. For contact information, select the facility nearest you. Locations where this service is offered MRC de Rimouski-Neigette Médecine nucléaire - Hôpital régional de Rimouski MRC de Rivière-du-Loup Médecine nucléaire - Centre hospitalier régional du Grand-Portage