|There are nearly 100 radioisotopes whose beta or gamma radiation is used in diagnosis investigations in nuclear medicine.
Radioisotopes are radioactive isotopes of an element. Different isotopes of the same element have the same number of protons in their atomic nuclei but differing numbers of neutrons. They can also be defined as atoms that contain an unstable combination of neutrons and protons.
A very effective role for radioisotopes in nuclear medicine is the use of short-lived positron emitters such as 11C, 13N, 15O, or 18F in a process known as Positron Emission Tomography (PET). Incorporated in chemical compounds that selectively migrate to specific organs in the body, diagnosis is effected by detecting annihilation gamma rays two gamma rays of identical energy emitted when a positron and an electron annihilate each other.
Scholarly peer review is the process of subjecting an author's scholarly work, research, or ideas to the scrutiny of others who are experts in the same field, before a paper describing this work is published in a journal. The work may be accepted, considered acceptable with revisions, or rejected. Peer review requires a community of experts in a given (narrowly defined) field, who are qualified and able to perform reasonably impartial review.