I'm from another healthcare discipline, and I think it would be a good idea to look at medical school interview resources, because there are just so many of them, the core values you want to focus on are the same. Practice some of those 'what would you do in this scenario' questions maybe? And practice other classic interview questions such as 'what are your weaknesses'...Shadow a clinician maybe? Even just have a phone chat with them to learn more about the role, given the covid situation. These are just some ideas at the top of my head, don't really know much about your subject area.
Ultimately you want to show that you are capable of finishing the degree, and you are the one who would fit in that therapeutic radiography department.