'Radioactivity' is the energy and mass released by spontaneous changes in the nucleus of an atom. However, 'Radiation' is energy that travels ('radiates') as waves or particles. Heat, light, sound, microwaves, radar, radio waves, X-rays, alpha and beta particles, and gamma rays are all forms of radiation.
For medicine, see etiology (medicine) . Etiology (/iËtiËÉlÉdÊi/ ; alternatively aetiology or aetiology) Ã¦tiology is the study of, causation or. Origination the word is derived from The greek, Î±á¼°ÏÎ¹Î¿Î»Î¿Î³Î¯Î±, aitiologia giving a reason (for, Î±á¼°ÏÎ¯Î±, aitia; cause -and, -Î»Î¿Î³Î¯Î±). logiatiology (/iËtiËÉlÉdÊi/ ; alternatively aetiology or aetiology) Ã¦tiology is the study of, causation or. origination
âEpidemiology is the study of the distribution and determinants of health-related states or events in specified populations, and the application of this study to the control of health problems.â (2). âEpidemiology is the study of the distribution and determinants of disease frequency in man.â (3). These definitions of epidemiology include several terms which reflect some of the important principles of the discipline: Study-Epidemiology is a scientific discipline and has at its foundation, sound methods of scientific inquiry.