Radioactive decay is defined as the process by which a radionuclide releases energy (in the form of alpha particles, beta particles, or gamma rays) over time, transforming into a different state until the element is stable again. What is Radioactive Decay and a Half-life? ![]() Nuclear Regulatory Commission to see what your personal exposure is. Use this Personal Annual Radiation Dose Calculator from the U.S. The term background radiation refers to the radiation that is always present in the environment, mostly from natural sources and a small portion from man-made sources. is exposed to an average annual radiation dose of 620 millirem (6.2 millisieverts), which is not considered harmful. According to the National Council on Radiation Protection and Measurements (NCRP), the average person in the U.S. Man-made sources include mining, power generation, nuclear medicine, military applications, and consumer products. Radiation has always been a natural part of our environment, with sources in the soil, water, and air. Examples include radio waves, microwaves, and visible light.
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