tokens: Radiobiological effects resulting from the following environments shall be analysed for all manned missions : 1 . trapped proton and electron belts ( terrestrial and other planetary belts ) ; 2 . solar protons and ions ; 3 . cosmic ray protons and heavier nuclei ; 4 . bremsstrahlung produced as secondaries from electrons ; 5 . secondary protons , neutrons and other nuclear fragments which can be generated in atmospheric showers in the planetary environment or within the spacecraft or planetary - habitat structure , including the body itself . NOTE This contribution is particularly important for cosmic - ray induced secondaries . 6 . emmisions from radioactive or nuclear - energy sources on the spacecraft . NOTE For example , RTGs generating g - ray and neutron radiation .