Like most of us, the IRPA15 Congress has been impacted by the coronavirus pandemic. The Congress has been postponed until January 2021. The IRPA15 Secretariat continues to process registrations and any requests on a daily basis. On behalf of the IRPA15 International Congress Organizing Committee (ICOC), it is my great pleasure to invite you to the 15th International Congress of the International Radiation Protection Association (IRPA) to be held on January 18-22, 2021 in Seoul, Korea....