ionization chamber

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an enclosed space.
Chambers of the eye. From Dorland's, 2000.
anterior chamber the part of the aqueous humor-containing space of the eyeball between the cornea and iris.
counting chamber the part of a hemacytometer consisting of a microscopic slide with a depression whose base is marked in grids, and into which a measured volume of a sample of blood or bacterial culture is placed and covered with a cover glass. The number of cells and formed blood elements in the squares is counted under a microscope and used as a representative sample for calculating the unit volume.
drip chamber the expanded portion of intravenous tubing into which fluid falls, where the rate of flow can be monitored if necessary. See also intravenous infusion.
hyperbaric chamber an enclosed space in which gas (oxygen) can be raised to greater than atmospheric pressure; see also hyperbaric oxygenation.
ionization chamber an enclosure containing two or more electrodes between which an electric current may be passed when the enclosed gas is ionized by radiation; used for determining the intensity of x-rays and other rays.
posterior chamber that part of the aqueous humor–containing space of the eyeball between the iris and the lens.
vitreous chamber the vitreous humor–containing space in the eyeball, bounded anteriorly by the lens and ciliary body and posteriorly by the posterior wall of the eyeball.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

i·on·i·za·tion cham·ber

a chamber for detecting ionization of the enclosed gas; used for determining intensity of ionizing radiation.
See also: Geiger-Müller counter.
Farlex Partner Medical Dictionary © Farlex 2012

ion·i·za·tion cham·ber

(ī'on-ī-zā'shŭn chām'bĕr)
A chamber for detecting ionization of the enclosed gas; used for determining intensity of ionizing radiation.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ion·i·za·tion cham·ber

(ī'on-ī-zā'shŭn chām'bĕr)
A chamber for detecting ionization of the enclosed gas.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
For the dosimetric characterization tests, we used an electrometer (Model Accu-Dose/2086, Radcal Corporation, USA), an ionization chamber (model 10X6-06-3, Radcal Corporation) and radiochromic Alms (Gafchromic EBT2, Ashland Advanced Materials, USA).
In that set of studies, which we refer to in this paper as the "2008 standardization", a calibration factor for NIST Ionization Chamber "A" (IC "A") was determined from the measured response of the chamber for [sup.223]Ra solutions in the standard NIST 5-mL ampoule geometry and the calibrated activity of gravimetrically-related solutions as measured using liquid scintillation (LS) counting and alpha spectrometry with 2n proportional counters.
The pocket ionization chamber of the device contains 1 positively charged and 1 negatively charged electrode.
For most ionization chambers (IC), links were established from the relative difference between the LSC-determined activity and the IC-determined activity using a given calibration factor.
Russell took the old ionization chambers apart, he found plastic debris that caused the artifacts.
The voltage-charge relationships for ionization chambers are modeled differently depending upon whether the incident radiation is continuous, pulsed, or swept [15].
Exposure can be measured by an ionization chamber positioned at the point of measurement.
Greening, The determination of saturation currents in free-air ionization chambers by extrapolation methods, Phys.
For over 30 years scientists in the NIST radioactivity group have been using their pressurized ionization chamber "A" (PIC "A") to make measurements of radioactivity and radioactive half-lives.
The reference air kerma rates were determined using a suite of six graphite wall cavity ionization chambers. The beam is collimated providing a circular beam size of 15 cm radius at a source-to-detector distance of 195 cm.