Radiation Wiki - What is the radiation?
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: electromagnetic radiation, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ) particle radiation, such as alpha radiation (α), beta radiation (β), and neutron radiation (particles of non-zero rest energy) acoustic radiation, such as ultrasound, sound, and seismic waves (dependent on a physical transmission medium) gravitational radiation, radiation that takes the form of gravitational waves, or ripples in the curvature of spacetime.Radiation is often categorized as either ionizing or non-ionizing depending on the energy of the radiated particles. Ionizing radiation carries more than 10 eV, which is enough to ionize atoms and molecules, and break chemical bonds. This is an important distinction due to the large difference in harmfulness to living organisms. A common source of ionizing radiation is radioactive materials that emit α, β, or γ radiation, consisting of helium nuclei, electrons or positrons, and photons, respectively. Other sources include X-rays from medical radiography examinations and muons, mesons, positrons, neutrons and other particles that constitute the secondary cosmic rays that are produced after primary cosmic rays interact with Earth's atmosphere. Gamma rays, X-rays and the higher energy range of ultraviolet light constitute the ionizing part of the electromagnetic spectrum. The word "ionize" refers to the breaking of one or more electrons away from an atom, an action that requires the relatively high energies that these electromagnetic waves supply. Further down the spectrum, the non-ionizing lower energies of the lower ultraviolet spectrum cannot ionize atoms, but can disrupt the inter-atomic bonds which form molecules, thereby breaking down molecules rather than atoms; a good example of this is sunburn caused by long-wavelength solar ultraviolet. The waves of longer wavelength than UV in visible light, infrared and microwave frequencies cannot break bonds but can cause vibrations in the bonds which are sensed as heat. Radio wavelengths and below generally are not regarded as harmful to biological systems. These are not sharp delineations of the energies; there is some overlap in the effects of specific frequencies.The word radiation arises from the phenomenon of waves radiating (i.e., traveling outward in all directions) from a source. This aspect leads to a system of measurements and physical units that are applicable to all types of radiation. Because such radiation expands as it passes through space, and as its energy is conserved (in vacuum), the intensity of all types of radiation from a point source follows an inverse-square law in relation to the distance from its source. Like any ideal law, the inverse-square law approximates a measured radiation intensity to the extent that the source approximates a geometric point..
What does the word radiation mean? Find synonyms, antonyms and the meaning of the word radiation in our free online dictionary! Find words starting with radiation and anagrams of radiation.
Definitions of "radiation"
- The act or process of radiating: the radiation of heat and light from a fire. noun
- Physics Emission and propagation and emission of energy in the form of rays or waves. noun
- Physics Energy radiated or transmitted as rays, waves, in the form of particles. noun
- Physics A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay. noun
- The act of exposing or the condition of being exposed to such energy. noun
- The application of such energy, as in medical treatment. noun
- Anatomy Radial arrangement of parts, as of a group of nerve fibers connecting different areas of the brain. noun
- The spread of a group of organisms into new habitats. noun
- Adaptive radiation. noun
- The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat. noun
- The process of radiating waves or particles. noun
- The transfer of energy via radiation (as opposed to convection or conduction) noun
- Radioactive energy noun
- The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness. noun
- The shooting forth of anything from a point or surface, like the diverging rays of light. noun
- The act of radiating, or the state of being radiated; specifically, emission and diffusion of rays of light and the so-called rays of heat. noun
- The divergence or shooting forth of rays from a point or focus. noun
- In zoology, the structural character of a radiate; the radiate condition, quality, or type; the radiate arrangement of parts. Also radiism. noun
The word "radiation" in example sentences
The term radiation alone is used commonly for this type of energy, although it actually has a broader meaning. ... light of wave length 570 nm illuminates a diffraction grating. the second-order maximum is at angle 41.5 degre?. [Yahoo! Answers: Latest Questions]
"[A] Librarian told me that they were forced to take all the literature with the word 'radiation' and put it in [an] archive," Shapiro said.. [Chernobyl Disaster Leads to Advances in Science, Medicine]
But unless the radiation is at least a couple of orders of magnitude above background, the additional cancers due to radiation are indistinguishable among the cancers due to chemicals, foods, viruses, and ancestry.. [Coyote Blog » Blog Archive » My Personal Experience with Climate Alarmist Spin]
This radiation is an afterglow of the violent processes assumed to have occurred in the early stages of the big bang.. [The Nobel Prizes in Physics 1901-2000]
And in this paper, they show something much more striking, and that was that they did what they call a radiation -- and I'm not going to go into the details of it, actually it's quite complicated, but it isn't as complicated as they might make you think it is by the words they use in those papers.. [Kary Mullis on what scientists do]
One of the hypotheses put forward at the beginning of our research by Pierre Curie and myself consisted in assuming that the radiation is an emission of matter accompanied by a loss in weight of the active substances and that the energy is taken from the substance itself whose evolution is not yet completes and which undergoes an atomic transformation.. [Marie Curie - Nobel Lecture]
Still, the word "radiation" conjures up a vague sense of impending doom for most people.. [Forbes.com: News]
"I'm not a nuclear physicist, I'm not a doctor, but you hear the word radiation, and yes it could be like having a chest x-ray," she says.. [NPR Topics: News]
Other than the word radiation and the reference to the Centers for Disease Control, Rapp hadn’t a clue as to what any of this meant.. [Vince Flynn Collectors’ Edition #2]
I wonder if the cancer given to you by the radiation is offset by the cancer killed by the antioxidants?. [Microwaving Beats Boiling For Veggies | Lifehacker Australia]
Titus has been working on Earthshine – measuring the albedo of the earth by measuring how much radiation from the earth lights up the (dark side of the) moon.. [2009 July | Serendipity]
The visible spectrum operates in wavelengths that have no effects to people (since they are light) whilst the arguments against cellphones, Wi-Fi and cellphone mast radiation is building to a point that medical effects are being looked into and people becoming extremely concerned.. [802.11n To Win The Wireless HD Video Sweepstakes]
I think that moving to a spectrum that does not create potential harmful electromagnetic radiation is the way we will move.. [802.11n To Win The Wireless HD Video Sweepstakes]
The second part, “Sheltering Sky,” is where Walker explains the various levels of our atmosphere, their history and discovery, from stratosphere to ionosphere – which is constantly being bombarded with radiation from the sun, but causes a reaction that protects the complex life below.. [2010 March 09 « The BookBanter Blog]
These are often excited by the radiation from the active nucleus of a galaxy.. [Another NRAO TV Appearance!]
It's all mixed together in my memory, along with watching Marine Boy cartoons on Saturday afternoons, or reading badly researched pop-sci features in the Daily Record about how we were all going to be living underground by 1985 to escape the UV radiation from a vanished ozone layer.. [MIND MELD: What Book Introduced You to Science Fiction?]
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