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free-air chamber

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free-air chamber
Etymology: AS, freo, free; Gk, aer, air; L, camera, vault
a device used throughout the world as a primary standard for calibrating x-ray exposure.


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? Mentioned in ? References in periodicals archive
 
The Wide-Angle Free-Air Chamber (WAFAC) is specially designed to realize air kerma from a single-seed source emitting photons with energies up to about 40 keV, and is now used to measure the wide variety of seeds used in prostate-cancer therapy that has appeared in the last few years.
New national air-kerma-strength standards for [.sup.125]I and ... by Coursey, Bert M. / Journal of Research of the National Institute of Standards and Technology
The correction factors applied to each free-air chamber and the associated uncertainties are listed in Tables 4 and 5 by radiation quality.
Comparison of the NIST and BIPM medium-energy x-ray air-kerma ... by Boutillon, M. / Journal of Research of the National Institute of Standards and Technology
The estimated uncertainties for the standard free-air chamber and re-entrant chamber are 1.
Exposure standardization of iodine-125 seeds used for brachytherapy by Loftus, T.P. / Journal of Research of the National Institute of Standards and Technology
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