Nuclear medicine is the branch of medicine that uses radioisotopes for research diagnosis and treatment of disease.Since its humble beginnings in 1958 (see here for details of how it was discovered), technetium-99m has become the most widely used radioisotope for diagnosing diseased organs. Technetium-99m is a metastable isotope of the element technetium.
All isotopes of a given element have the same number of protons in each atom.
From left to right, the isotopes are protium ( Isotopes are variants of a particular chemical element which differ in neutron number.
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There is, however, strong evidence that they used sticks and bones to help them dig and defend themselves.
The term isotope is formed from the Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.
Often, elements come in both radioactive and nonradioactive versions that differ in the number of neutrons they contain.
These different versions of elements are called isotopes, and small quantities of radioactive isotopes often occur in nature.
The name originates from the Greek word 'technetos' meaning artificial! In order for that nucleus go to a more stable state it has to give out the excess energy, it does this by emitting a gamma ray.