alpha radiator americium astatine atomic cocktail berkelium beta radiator cobalt curium einsteinium fermium fission products fluorescent paint francium gamma radiator hahnium mendelevium neptunium plutonium polonium promethium protactinium radiator radioactive waste radiocalcium radiocarbon radiocopper radioiodine radioisotope radiosodium radiothorium radium radium dial radium paint radon tagged element technetium tracer tracer atom tracer element uranium