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.
sample of radioactive material contains a large number of nuclei (say at least 1012 nuclei), it is possible to predict the average rate of decay with high probability. A basic concept of radioactive decay is that the probability of decay for each type. of radioactive nuclide is constant.