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. But radioisotopes are also used to find and treat cancer. In certain imaging procedures, for example, radioisotopes are injected into the body where they then collect in areas where the disease is active, showing up as highlighted areas on the images. In breast cancer, radioisotopes are used to check for metastasis to the bones.
a nuclide with an unstable ratio of neutrons to protons placing the nucleus in a state of stress. In an attempt to reorganize to a more stable state, it may undergo various types of rearrangement that involve the release of radiation.
Unstable molecule that emits detectable radiation (gamma rays, X-rays, etc.) for a known period of time (half-life). Can be incorporated into other compounds as a label for later detection by X-ray film exposure or by measurement in a scintillation counting instrument.
A particular form of chemical element that is radioactive.
A radioactive substance that emits specific kinds of radiation. Radioisotoptes of iodine are used for thyroid scans and thyroid therapy.
Form of a chemical element with unstable neutron number, so that it undergoes spontaneous nuclear disintegration. Major use in biology is to trace the fate of atoms or molecules that follow the same metabolic pathway or enzymic fate as the normal stable isotope, but that can be detected with high sensitivity by their emission of radiation. Also used to locate the position of the radioactive metabolite, as in autoradiography and to measure relative rates of synthesis of compounds from radioactive precursors.
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.
Compare with isotope. radioactive isotope. For example, tritium is a radioisotope of hydrogen.
The isotopes of an element that are unstable (radioactive).
Isotopes that give off radiation.
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 radioisotopes under controlled conditions can be used to treat cancer (see radiotherapy). In certain nuclear medicine imaging procedures, radioisotopes are injected. They travel through the body and collect in areas where the disease is active, showing up as highlighted areas on the images (see nuclear medicine scan). In breast cancer, radioisotopes are used to check for metastasis to the bones.
an element that is unstable and uses some radiation to achieve a stable state
an unstable form of an isotope
an unstable radioactive isotope that decays to a stable state by emitting radiation
An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation. Approximately 5,000 natural and artificial radioisotopes have been identified.
An isotope possessing radioactivity.
An isotope that is radioactive.
Contraction for words "radioactive isotope" of an element.
An unstable isotope of an element that eventually will undergo radioactive decay (i.e., disintegration). Radioisotopes with special properties are produced routinely for use in medical treatment and diagnosis, industrial tracers, and for general research.
An unstable isotope of an element that decays by emitting particles or gamma radiation or X-radiation.
A radioactive isotope; i.e., an unstable isotope that undergoes spontaneous transformation, emitting radiation. Approximately 2500 natural and artificial radioisotopes have been identified.
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 through one or more radioactive decays. Approximately 3,700 natural and artificial radioisotopes have been identified.
a radioactive material injected into the body so that a nuclear scanner can make pictures.
Naturally or artificially produced radioactive isotope of an element.
A chemical element that is radioactive. It has an unstable nucleus that gives it the property of decay by one or more processes. It is important for diagnostic and therapeutic use.
Type of atom (or a chemical that is made with a type of atom) that emits radioactivity.
A radioactive isotope of an element. Examples are carbon-14 (14C) and hydrogen-3, or tritium (3H).
A radioactive form of an element. In research radioisotopes are widely used to label specific molecules, which can be detected by the radiation they emit.
A nuclide. A radioactive isotope (unstable isotope) which spontaneously emits particulate (alpha beta) or electromagnetic (gamma) radiation as it decays to a stable state.
A type of atom (or a chemical which is made with a type of atom) which emits radioactivity
A radioactive isotope. Radioisotopes are used in medical research as tracers. See also isotope, nuclide, and radionuclide.
Any isotope which is unstable and undergoes natural radioactive decay.
Isotope of an atom that spontaneously emits one or more types of radioactivity (alpha particles, beta particles, gamma rays).
A radioactive isotope. See; Isotopes, Radioactivity.
A radioactive isotope. A common term for a radionuclide.
An unstable element that releases radiation as it breaks down. Radioisotopes can be used in imaging tests or as a treatment for cancer.
Those isotopes of an element, which are radioactive.
Unstable isotopes that release radiation when they break down. 'Unstable' is a relative term: some radioisotopes last only for seconds, others for millions of years. Some occur naturally, for example carbon-14 used in radiocarbon dating; others are made artificially, such as americium-241 used in smoke detectors.
An unstable isotope of an element that undergoes radioactive decay toward a more stable form.
A natural or artificial isotope exhibiting radioactivity, used as a source for medical or industrial purposes
A radioactive substance used to highlight internal organs.
Unstable form of an atom that emits radiation as it decays. Several radioisotopes are commonly used experimentally as labels in biological molecules.
An isotope subject to the decay associated with radioactivity. A radioisotope is thus an unstable isotope.