In the context of RadoNorm WP6, an invitation to tender from SCK CEN has been opened for communication agencies who are willing and able to conduct a large scale study on radon communication. This study aims to develop and test radon communication tools focused on protecting people from the health risks of radon. The study will encompass various countries and is the largest of its kind in Europe to date. Interested communication agencies can find the invitation to tender and enter their details through the following link: https://enot.publicprocurement.be/enot-war/preViewNotice.do?noticeId=484763. The deadline for submissions is June 27^th, 2023.