A version of a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form. Radioisotopes have important uses in medical diagnosis, treatment, and research.

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in im [..]

  A radioactive isotope.

A radioactive isotope. For example, tritium is a radioisotope of hydrogen.

An isotope that changes to a more stable state by emitting radiation.

1946, from radio-, comb. form of radiation, + isotope.

An unstable isotope of an element that decays or disintegrates spontaneously, thereby emitting radiation. Approximately 5,000 natural and artificial radioisotopes have been identified.

Injecting a radioactive substance into the body in order to make pictures with a nuclear scanner.

A radioactive isotope.

An unstable isotope of an element that decays or disintegrates spontaneously, emitting energy (radiation). Approximately 5,000 natural and artificial radioisotopes have been identified. Some radioisot [..]

A radioisotope is an isotope that is radioactive.Examples: Carbon-14 is a radioisotope of carbon.

An unstable element that releases radiation as it breaks down. Radioisotopes can be used in imaging tests or as a treatment for cancer.

(n) - a radioactive isotope of an element

An isotope that is radioactive. Most natural isotopes lighter than bismuth are not radioactive. Three natural radioisotopes are radon-222, carbon-14 and potassium-40.

An isotope of an element that is radioactive.

isotopes of an element that have an unstable nucleus. Radioactive isotopes are commonly used in science, industry, and medicine. The nucleus eventually reaches a stable number of protons and neutrons [..]

A radioactive isotope. A common term for a radionuclide.

An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation. Approximately 5,000 natural and artificial radioisotopes have been identified.

(n) a radioactive isotope of an element; produced either naturally or artificially

An atom that has an unstable nucleus; also called a radioactive isotope (Lesson 25)

Also called isotope. A type of atom that is unstable and prone to break up (decay). Decay releases small fragments of atoms and energy. Exposure to certain radioisotopes can cause cancer. Use of radio [..]

Naturally or artificially produced radioactive isotope of an element.

A radioisotope is an isotope that has an unstable nucleus. The nucleus emits a nuclear radiation to attain stability by a process called radioactive decay. 

Definition: (ray-dee-oh-EYE-so-towp) An unstable element that releases radiation as it breaks down. Radioisotopes can be used in imaging tests or as a treatment for cancer, e.g., in brachytherapy. In [..]

A radioactive material frequently used in imaging procedures to safely diagnose or treat disease, or to evaluate response to treatment.

Radioisotope: a form of a chemical element which undergoes spontaneous nuclear disintegration, emitting radiation.

Unstable form of an atom that emits radiation as it decays. Several radioisotopes are commonly used experimentally as labels in biological molecules.

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment. Also called radionuclide.

a radioactive material injected into the body so that a nuclear scanner can make pictures.

Radioactive liquid.