An isotope is one of two or more species of atoms of a chemical element with the same atomic number . same number or protons in the nucleus and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties. Every chemical element has one or more isotopes. Radioisotope: 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.Isotopes are the atoms in an element that have the same atomic number but a different atomic mass; that is, the same number of protons and thus identical chemical properties, but different numbers of neutrons and consequently different physical properties. Isotopes can be stable or unstable or radioisotopes. In the latter, their nuclei have a special property: they emit energy in the form of ionizing radiation while searching for a more stable configuration.A lot of this radioisotopes are really full for a lot of thing. They can be used for medicine carbon dating .and energy and nuclear energy.radioisotopes can be really useful in medicine some radioisotopes can be helpful to identify different function in or malfunctioning organs and how to treat them. There is Radiotherapy can be used to treat some medical conditions, especially cancer, using radiation to weaken or destroy particular targeted cells.Over 40 million nuclear medicine procedures are performed each year, and demand for radioisotopes is increasing at up to 5% annually.Sterilization of medical equipment is also an important use of radioisotopesDifferent isotopes are used for different purposes in medicine for example come isotopes like 32p are used to recognise and treat cancer cells while other isotopes like 59 fe are use for anemia diagnosis.And they are many more this isotopes are saving the lives of a lot of person and helping and preventing the illnesses they have Isotopes that emit positrons can be employed in a medical imaging technique called positron emission tomography . A patient receives a compound containing a positron-emitting isotope, either in injection or by ingestion. The radioactive compound travels throughout the body by the blood , and the patient is then pushed slowly through a ring of sensors and cameras that detect the gamma radiation given off by the positrons and electrons. A computer connected to the sensors detects the radiation and constructs a three-dimensional image of the interior of part or all of the patient’s body, allowing doctors to see organs or tumors or regulate the function of various organs such as the brain or the heart to diagnose the medical condition of the patient. Radioisotopes have found extensive use in diagnosis and therapy, and this has given rise to a rapidly growing field called nuclear medicine. These radioactive isotopes have proven particularly effective as tracers in certain diagnostic procedures. Though many radioisotopes are used as tracers, iodine-131, phosphorus-32, and technetium-99m are among the most important. used with radiographic scanning devices, is valuable for studying the anatomic structure of organs.Such radioisotopes as cobalt-60 and cesium-137 are widely used to treat cancer. They can be administered selectively to malignant tumours and so minimize damage to adjacent healthy tissue. And stop the growth.One of the mmst important radioisotopes in medicine is Technetium-99m is that is used in 20 million diagnostic nuclear medical procedures every year. Approximately 85% of diagnostic imaging procedures in nuclear medicine use this isotope as the radioactive tracer.As you now radiation can also be deadly and there isn’t a lot to do about it except for using protection likewearing protective clothingkeeping as far away as is practicable – for example, by using tongskeeping your exposure time as short as possible, andkeeping radioactive materials in lead-lined containers, labelled with the appropriate hazard symbol.