Appendix VII
Glossary
Absorption
The transfer of energy to a medium, such as body tissues, as a radiation beam passes through the medium.
Accelerator
A device machine used to produce high-energy high-speed beams of charged particles, such as electrons, protons, or heavy ions, for research in high-energy and nuclear physics, synchrotron radiation research, medical therapies, and some industrial applications.
Annihilation
A process in which a particle meets its corresponding antiparticle and both disappear. Their energy and momentum appears in some other form, producing other particles together with their antiparticles and providing their motion.
Angstrom
A unit of length equal to 10–10 meter.
Antimatter
A material made from antiparticles. The ...
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