TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

A recently developed instrument known as an "emanometer, "or "radon sniffer, "has been used to measure the radon content of water, oils and soils. Since radon is a noble gas, it does not form chemical compounds. It moves freely through pore spaces, joints and faults for distances up to several hundred feet. It will also dissolve in ground water and so move about in the subsurface. Air samples are obtained from the soil by drilling a short hole(2-3 ft) and pumping air from the hole through filters and a dryer into an ionization chamber or thin ZnS scintillator. Water samples are degassed and the air-gas mixture goes to the detecting chamber.  1, record 1, English, - emanometer

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Tube renfermant un absorbant utilisé en prospection géochimique pour capter les émanations de radon dans l'eau ou le sol.  1, record 1, French, - %C3%A9manom%C3%A8tre

Record number: 1, Textual support number: 1 CONT

L'émanomètre de radon est un instrument portatif constitué de deux parties: 1) un appareillage qui concentre le [radon] [...] 2) un scintillomètre. On échantillonne des eaux de surface ou souterraines dans un récipient en verre ou on pompe «in situ» un échantillon d'air issu des pores dans les sols.  2, record 1, French, - %C3%A9manom%C3%A8tre

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

Optoacoustic detector. Light which is absorbed by a molecule is generally reradiated from the molecule in the form of heat. If a laser, at an absorbing wavelength of a gas of interest, is passed through a closed cell, the temperature of the entire gas in the cell will rise and thus the pressure of the gas in the cell will rise. If the laser is turned on and off at a frequency of 100-20000 Hz, the resulting pressure rises and drops can be picked up as a signal by sensitive microphones. This somewhat odd combination of optics and acoustics turns out to have several advantages over systems which measure the absorption directly. The absorption will be quite small and thus the change in intensity of the laser beam is nearly impossible to detect. Because pressure in the cell rises more quickly for small length cells, this effect exactly cancels out gains in overall absorption by making the cell longer. Thus, a small optoacoustic cell will accomplish the same as a larger cell making its size a great asset.... The device is being tested as a sniffer for bomb vapours and for ambient air analyses.  1, record 2, English, - optoacoustic%20detector

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish