It's both natural and man-made. A natural source of ionizing radiation is radon, a radioactive material found underground. X-rays are a good example of man-made ionizing radiation. The three types of ionizing radiation we're going to discuss here are alpha particles, beta particles and ...
Outside of naturally occurring sources of radiation, there are man-made processes that produce radioactive material that the average person may come into contact with on a regular basis. The levels are still fairly low, with annual exposure to the public due to artificial sources being roughly ...
The majority of background radiation occursnaturally from mineralsand a small fraction comes from man-made elements. Naturally occurring radioactive minerals in the ground, soil, and water produce background radiation. The human body even contains some of these naturally-occurring radioactive minerals....
Electromagnetic (EM) radiation occurs both naturally (e. g. , sunlight) and from man-made sources (e. g. , wireless devices). Read Electromagnetic Radiation | Definition, Wavelength & Examples Lesson Recommended for You Video: Radiant Energy | Definition, Uses & Examples Video: Paramagnetic v...
There is a large number of naturally occurring and man-made radionuclides that emit these particles. If one knows the activity concentration of a radionuclide in the tissue and the energy of the particles, the dose can be calculated from (11.2.46)D=AmEΔt, where Am is the activity per ...
Alpha particles are positively charged particles that comprise two protons, two neutrons, and zero electrons. A single particle's mass is 4 amu (6.642×10−4 g), according to Britannica Alpha particles are emitted from heavy radioactive elements (both naturally occurring and man-made), includin...
natural radiation includes naturally existing non-ionising and ionising radiation sources from the ground, the sun, outer space, and even from within our own bodies. man-made ionising and non-ionising sources such as microwaves, smoke detectors, electrical power lines and cell phones. the three ...
Senescence occurs naturally and results from the shortening of telomeres which leads to DNA damage. When a cell is in senescence, it stops dividing but remains metabolically active. Most cancers start from a single cell (Hanahan & Weinberg, 2000). Interestingly, it has been shown in vitro that...
and nuclear radiation. 和核辐射。 Electromagnetic radiation is pure energy 电磁辐射是纯能量 consisting of interacting electrical and magnetic waves 由相互作用的电磁波 oscillating through space. 在空间中振动形成。 As these waves oscillate faster, ...
Sulfate aerosol is generated by the sequence of chemical processes involving sulfur dioxide (SO2), emitted into the atmosphere naturally or anthropogenically, and water vapor through photochemistry. Nitrates follow a chemical sequence similar to that for sulfates. However, the physics and chemistry of ...