TERMIUM Plus^®

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Both the positive ions and the free electrons can be made to drift in a preferred direction by applying an external electric field. It is the movement of these charges that serves as the basis for the electrical signal produced by the important category of gas-filled detectors that includes ion chambers, proportional counters, and Geiger-Müller detectors.  2, fiche 1, Anglais, - gas%2Dfilled%20detector

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Les chambres à fission sont des détecteurs remplis de gaz dont les parois internes sont recouvertes d'une fine couche (de l'ordre du mg/cm² au plus) d'uranium enrichi en 235U, en général, ou, plus rarement, d'autres actinides (notamment du plutonium).  1, fiche 1, Français, - d%C3%A9tecteur%20rempli%20de%20gaz

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The Transition Radiation Detector... consists of six polyethylene fiber radiator blankets, each with a multi-wire proportional chamber MWPC(filled with a Xenon-methane gas mixture) attached underneath. When a charged particle travels through an interface between materials of different dielectric constants, radiation(in the form of X-rays) is generated with an intensity proportional to the relativistic Lorentz factor gamma of the particle.  2, fiche 2, Anglais, - transition%20radiation%20detector

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Fiche 3,  Justifications,  Anglais

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Chemical spot tests use glass detector tubes to determine concentrations of a wide range of gases in air. The tubes are filled with a chemical that reacts with a particular gas to give a colour development as air is drawn through the tube. Chemical spot testing equipment is available from at least three manufacturers.  1, fiche 3, Anglais, - glass%20detector%20tube

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Ces tubes, en verre, permettent de déterminer les concentrations d'une grande variété de gaz dans l'air. Les tubes contiennent des produits chimiques qui réagissent avec le gaz qu'on y introduit à l'aide d'un soufflet, en donnant une réaction colorée dont la longueur est proportionnelle à la concentration du gaz. Au moins trois fabricants produisent ce genre de tube.  1, fiche 3, Français, - tube%20d%C3%A9tecteur

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A simple arrangement of two cavities in series showed the feasibility of detecting traces of one gas in another. A klystron was used to generate microwave power which was fed through a wave guide to a transmission-type cavity. Another cavity was mounted in series with and tuned to the same frequency as the first; both cavities were identical except that the second had a gas inlet and outlet ports. From this measuring cell, its microwave energy was sent to a crystal detector. By frequency-modulating the klystron with a 50-cps sine wave voltage on the repeller, a burst of energy passes to the detector each time the generator frequency equals that of the cavities. The detector current is amplified and measured with an oscilloscope. At the beginning of the run, the two cavities are filled with the nitrogen carrier gas and, if the composition in one of the cavities is changed, its electrical size will change... causing a decrease of current from the detector.  1, fiche 4, Anglais, - crystal%20detector

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