The united kingdom has a 120 tons of nuclear waste, i have no idea which radionuclides constitute the largest portion, i want to know this. furthermore, if you can find which radionuclide it is, can you please tell me the decay mode it uses, its half life, and if it emits any decay heat. Thank you very much in advance. I know I don't live in the UK, but the UK has the largest civilian reserves for radioactive substances, hence the the reference. I'm thinking of devising a method, where nuclear waste is used to generate surplus energy. you send a highly volatile yet abundant liquid such as dry cleaner fluid or previously heated water ( has a lower boiling point) through a beta or alpha irradiated chamber with radionuclides that produce vast of amounts decay heat, in the range of 200 mega watts. this heated liquid will spin a turbine, generating electricity.