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| Terms for subject Environment (31552 entries) |
| raveinement | induced recharge of aquifer | |
| raveinement | recharge | |
| ravenelle | charlock | |
| ravenelle sauvage | wild radish | |
| ravinement | ravine erosion | |
| rayon d'appel | drainage radius | |
| rayon de destruction | destruction in a circle | |
| rayonnement | 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) | |
| rayonnement alpha | 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) | |
| rayonnement ambiant | background radiation | |
| rayonnement ambiant | 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) | |
| rayonnement ambiant naturel | natural background radiation | |
| rayonnement bêta | beta radiation | |
| rayonnement beta | beta radiation | |
| rayonnement bèta | beta radiation | |
| rayonnement 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) | |
| rayonnement cosmique | 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) | |
| rayonnement gamma | gamma radiation (Radiation of gamma rays) | |
| rayonnement infrarouge | infrared radiation (Electron magnetic radiation whose wavelengths lie in the range from 0.75 or 0.8 micrometer to 1000 micrometers) | |
| rayonnement ionisant | 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) |