Outlook. The outlook for a person who has radiation sickness depends on the amount of radiation that they were exposed to and the amount of time that they were exposed to it. If only a low dose of radiation was received, most people will be able to completely recover from it. However, there are often long-term health problems for those who manage to survive a high dose of radiation. That is mainly because of the damage that it does to the body. It is also important to mention that radiation exposure can contribute to a person developing many different types of cancer. So it is crucial that they receive regular check-ups from their doctor to monitor their health.