The 3 types of Radiation astronauts should be worried about are Galactic Cosmic Radiation , Trapped Radiation , and Solar Particle Events .The 3 types of radiations are dangerous because they contain Ions . They either contain Ions or they create Ions . Ions are atoms that contain positive particles called protons. They can also cause Cancer or other diseases . They come from the sun and earth , but mainly its in space because that the only place where it's more likely to be found . We are protected from them because those types of radiations because they can mainly only be found on space or occurred on space .