ionization chamber

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chamber

 [chām´ber]
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.

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.

ionization chamber

a small cavity filled with air that collects the ionic charge liberated during irradiation. The exposure and dose of radiation can be calculated from the amount of change liberated and the mass of air in the chamber.

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.

ion·i·za·tion cham·ber

(ī'on-ī-zā'shŭn chām'bĕr)
A chamber for detecting ionization of the enclosed gas.

chamber

an enclosed space.

anterior chamber
the part of the aqueous humor-containing space of the eyeball between the cornea and iris.
hyperbaric chamber
an enclosed space in which gas (oxygen) can be raised to greater than atmospheric pressure. See also hyperbaric oxygenation.
ionization chamber
see ionization chamber.
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.

ionization

1. the dissociation of a substance in solution into ions.
2. iontophoresis.

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.
References in periodicals archive ?
The NIST pressurized ionization chamber "A" has been used since the 1960s to maintain activity standards via calibration factors (K-values, vide infra) [83].
The oldest and best-established personnel dosimeter is the film badge; others include the optically stimulated luminescent (OSL) dosimeter, the pocket ionization chamber and the thermoluminescent dosimeter (TLD).
Several studies, including this report, have employed a cylindrical ionization chamber model Radcal 10X5-1800 (1) with 1800 [cm.
Seltzer, Correction Factors for the NIST Free-Air Ionization Chambers Used to Realize Air Kerma from W-Anode X-Ray Beams, Report NISTIR 7887, National Institute of Standards and Technology, Gaithersburg, MD (2012).
The BRH suggested a measurement procedure based on 2 concepts, the Computed Tomography Dose Index (CTDI) and the Multiple Scan Average Dose (MSAD), using a single ionization chamber measurement.
Since the 1960's the NIST pressurized ionization chamber "A" (PIC "A") has been used for two main purposes.
Air kerma calibration coefficients for a reference class ionization chamber from narrow x-ray spectra and cesium 137 gamma-ray beams were compared between the National Institute of Standards and Technology (NTST) and the Kenya Bureau of Standards (KEBS).
Main characteristics of ionization chambers used as transfer standards Model Serial number Type Sensitive volume Collector diameter A11 114 PLANAR 0.
125]I brachytherapy seeds then available, Loftus [11] performed measurements with the national primary x-ray standard Ritz free-air chamber, and transferred the results to a spherical aluminum re-entrant ionization chamber which then served as the secondary standard for routine calibrations.
Summary of pertinent correction factors, as modified 1 January 1986, for NBS-NIST primary-standard graphite-wall ionization chambers Chamber [k.
At the NIST and at the BIPM the transfer ionization chambers and each standard chamber remain fixed in position throughout the comparison measurements.
Contract award: Instrumentation hospitals KrEilove region II, therapeutic X-ray irradiation for a field ionization chambers, including software for radiotherapy II.