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There are also a number of unstable natural isotopes arising from the decay of primordial uranium and thorium. At present there are up to 200 radioisotopes used on a regular basis, and most must be produced artificially. The most common is by neutron activation in a nuclear reactor.This involves the capture of a neutron by the nucleus of an atom resulting in an excess of neutrons (neutron rich).
(Authors who do not wish to use symbols sometimes write out the element name and mass numberhydrogen-1 and uranium-235 in the examples above.) Isotopes utilized in nuclear medicine fall into two broad categories: Stable and Unstable. Stable isotopes remain unchanged indefinitely, but "unstable" (radioactive) isotopes undergo spontaneous disintegration.Three primary treatments of the brain in mummification, and their variation over time and across social strata, are discussed in relation to their treatment in the literature, their radiological indicators, and their technical considerations.In order to examine Egyptian mummy excerebration, this study makes use of two samples: (1) a literature-based sample of 125 mummies, and (2) a sample of 6 mummies examined directly using computed tomography.Isotopes | Stable & Unstable | Applications | Definitions | Diagnosis | Radiotherapy | Biochemical Analysis Diagnostic/Therapeutic Radiopharmaceuticals | Discovery | Isotopes in Medicine | Terms & Concepts 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. An atom is first identified and labeled according to the number of protons in its nucleus.This atomic number is ordinarily given the symbol Z.
Stable isotopes already play an important role in research today and will become even more important to research in the future.