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2.2 Procedures involving ionising radiation include: Diagnostic X-rays, CT scans or DXA scans Radiotherapy (including brachytherapy and therapy using unsealed sources) Radionuclide imaging (including diagnostic imaging and in vitro measurements).
Ionizing radiation is radiation with enough energy so that during an interaction with an atom, it can remove tightly bound electrons from the orbit of an atom, causing the atom to become charged or ionized. Ionizing radiation has enough energy to electrically charge or ionize matter. The cells in living organisms are also made of matter, so they too can be ionized. Cosmic rays, x-rays, gamma rays, alpha particles and beta particles are forms of ionizing radiation. Ionizing radiation may come from a natural source such as the Sun or it may come from a man-made source such as an x-ray machine.