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| Terms for subject Environment (5179 entries) |
| quitrà | tar (A viscous material composed of complex, high-molecular-weight, compounds derived from the distillation of petroleum or the destructive distillation of wood or coal) | |
| quocient de reciclatge | recycling ratio | |
| radar | radar (A system using beamed and reflected radiofrequency energy for detecting and locating objects, measuring distance or altitude, navigating, homing, bombing and other purposes) | |
| radi | radio (The process, equipment or programming involved in transmitting and receiving sound signals by electromagnetic waves) | |
| radiació | solar radiation (The electromagnetic radiation and particles emitted by the sun) | |
| radiació | radiation (Emission of any rays from either natural or man-made origins, such as radio waves, the sun's rays, medical X-rays and the fall-out and nuclear wastes produced by nuclear weapons and nuclear energy production. Radiation is usually divided between non-ionizing radiation, such as thermal radiation (heat) and light, and nuclear radiation. Non-ionizing radiation includes ultraviolet radiation from the sun which, although it can damage cells and tissues, does not involve the ionization events of nuclear radiation) | |
| radiació alfa | alpha radiation (A stream of alpha particles which are ejected from many radioactive substances having a penetrating power of a few cm in air but can be stopped by a thin piece of paper) | |
| radiació beta | beta radiation (Name given to the ionizing radiation which is produced as a stream of high speed electrons emitted by certain types of radioactive substance when they decay. The intensity of radiation energy produced in human tissue by a beta particle is a hundred times less than that produced by an alpha radiation particle, but it travels slightly deeper into tissue) | |
| radiació còsmica | cosmic radiation (Radiations consisting of atomic nuclei, especially protons, of very high energy that reach the earth from outer space. Some cosmic radiations are very energetic and are able to penetrate a mile or more into the Earth) | |
| radiació de fons | background radiation (Radiation resulting from natural sources, as opposed to man-made sources, and to which people are exposed in everyday, normal life; for example from rocks and soil) | |
| radiació gamma | gamma radiation (Radiation of gamma rays) | |
| radiació infraroja | infrared radiation (Electron magnetic radiation whose wavelengths lie in the range from 0.75 or 0.8 micrometer to 1000 micrometers) | |
| radiació ionitzant | ionising radiation (Radiation that is capable of energizing atoms sufficiently to remove electrons from them. In this state atoms become more reactive, so that ionizing radiation increases chemical activity and in this way produces biological effects, including effects that involve alterations induced in DNA. X-rays and gamma-rays are the only electromagnetic waves that cause ionization in biological material) | |
| radiació no ionitzant | non-ionising radiation (Radiation that does not change the structure of atoms but does heat tissue and may cause harmful biological effects) | |
| radiació ultraviolada | ultraviolet radiation (The part of the electromagnetic spectrum with wavelengths shorter than light but longer than x-rays; in the range of 4-400 nm) | |
| radioactivitat | radioactivity (The property possessed by some atomic nuclei of disintegrating spontaneously, with loss of energy through emission of a charged particle and/or gamma radiation) | |
| radioactivitat natural | natural radioactivity (Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc.) | |
| radionúclid | radionuclide (A nuclide that exhibits radioactivity) | |
| radó | radon (A radioactive gaseous element emitted naturally from rocks and minerals where radioactive elements are present. It is released in non-coal mines, e.g. tin, iron, fluorspar, uranium. Radon is an alpha particle emitter as are its decay products and has been indicted as a cause of excessive occurrence of lung cancer in uranium miners. Concern has been expressed at radon levels in some housing usually adjacent to granite rocks or old tin mining regions) | |
| raigs X | X ray (A penetrating electromagnetic radiation, usually generated by accelerating electrons to high velocity and suddenly stopping them by collision with a solid body, or by inner-shell transitions of atoms with atomic number greater than 10; their wavelength ranges from about 10(-5) angstrom to 10 angstroms, the average wavelength used in research being 1 angstrom) |