| radiation chemistry(noun, expression, study, treatment, science) |
| radioactive element(noun, expression, form, study, science) |
| radioactive isotope(noun, expression, form, study, science) |
| radioactive source(noun, expression, form, study, science) |
| radioactive substance(noun, expression, form, study, science) |
| radioactive tracer(noun, expression, form, study, science) |
| radioactivity(noun, form, study, science, field) |
| radioisotope(noun, study, treatment, science, knowledge) |
| radiometric method(noun, expression, study, treatment, science) |
| radiotherapy(noun, form, study, science, field) |
| radon(noun, form, study, science, field) |
| specific activity(noun, expression, study, treatment, science) |
| stable isotope(noun, expression, form, study, science) |
| study of nuclear reactions(noun, expression, study, treatment, science) |
| thorium(noun, study, treatment, science, knowledge) |
| unstable isotope(noun, expression, study, treatment, science) |
| uranium(noun, study, treatment, science, knowledge) |
| uranium ore(noun, expression, study, treatment, science) |
| use of radiation(noun, expression, form, study, science) |
| x-ray(noun, study, treatment, science, knowledge) |