radioactive atom

ra·di·o·ac·tive at·om

an atom with an unstable nucleus, which emits particulate or electromagnetic radiation (radioactive emission) to achieve greater stability. See: radionuclide, half-life, Becquerel.
References in periodicals archive ?
Mastering the fission of radioactive atom to enable it to release energy is not a child's play; states invest billions in currency to make nuclear weapons.
"What we came up with was, if you shine light on them, could these photocatalysts actually remove the non-radioactive atom and then install the radioactive atom?"
Kaiser said that the experiment would go something like this: A laboratory setup would consist of a particle generator, such as a radioactive atom that spits out pairs of entangled particles.
Each radioactive atom, or "radionuclide," decays in a
Because they added a radioactive atom to the messenger RNA and fluorescent tags to the other proteins required for protein manufacture, the team could evaluate mRNA recruitment under various conditions - with and without a cap, for instance, and in the presence and absence of various other factors.
If a radioactive atom, for example, [sup.125]I, is introduced into the body, it is assimilated by the body just as a nonradioactive isotope of the same element would be.
Quantum systems can shift their energy state at random, as occurs when a radioactive atom decays.
These are drugs that carry a low-level radioactive atom that can be tracked around the body to locate cancerous tumours.
Harriet Brooks, discoverer of the recoil of the radioactive atom and of successive nuclear decays, was honoured recently in Ottawa, ON, by being inducted into the Canadian Science and Technology Hall of Fame.
"By any reasonable standard of biomedical proof," says Gofman, "there is no safe dose [of radiation]; just one decaying radioactive atom can produce permanent mutation in a cell's genetic molecules." The United Nations Scientific Committee on the Effects of Atomic Radiation and the British Radiological Society, among others, agree with Gofman.
In PET scanning, a radioactive atom bound within a glucose molecule is injected into the body and drawn to a high-metabolic area (for example, the rapid cell growth of a brain tumor).
John, who is studying for his PhD in chemistry, is researching ways to attach the radioactive atom to new drugs to help improve medical imaging techniques used by doctors in diagnosis.