10 Things You Didnât Know About Chronic Fatigue Syndrome. Chronic Fatigue Syndrome (CFS) is undeniably complicated in every conceivable way. The disorder has been around for decades, but the medical community has yet to assemble a clear picture of it. The condition is characterized by extreme fatigue that canât be explained by any underlying medical condition.
A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is an atom that has excess nuclear energy, making it unstable.
As in all nuclear decays, the decaying element (in this case 14 6C) is known as the parent nuclide while the resulting element (in this case 14 7N) is known as the daughter nuclide. The emitted electron or positron is known as a beta particle.