Atomic particles which decay by natural radioactivity.
Radioactive nuclides of the same element (same number of protons in their nuclei) that differ in the number of neutrons.
Radioactive materials used in cancer therapy, medical diagnostic techniques, agriculture and industry.
Elements in a form with unstable nuclei that achieve a more stable nuclear configuration by emitting excess energy as radiation (radioactive decay). Radioisotopes can be used to label certain chemicals to measure body function.
Artificially radioactive elements.
Chemical variants of radioactive elements with potentially oncogenic, teratogenic, and mutagenic effects on the human body.