ion chamber


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ion chamber

[′ī‚än ‚chām·bər]
(nucleonics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In addition, the laboratory analysed 513,798 individual measurements of gamma dose rates from a network of 13 monitoring stations across the UAE, and 628 measurements of gamma dose rates taken throughout the UAE using a portable high pressure ion chamber.
The reading of cylindrical ionisation chamber N30001 (PTW Freiburg, Germany) was corrected to standard environment conditions of temperature and pressure for which ion chamber calibration factors were applied.17
Instead of using a heat conversion process, which has limited efficiency, the process uses kinetic energy of the decay particle to run an ion chamber and create electricity.
This is due to inefficient channeling of electrons from the filament ("e-gun") into the ion chamber, giving an extremely low signal and an unacceptable loss of sensitivity.
When using a free-air ion chamber for radiation dosimetry, readings must be corrected for incomplete charge collection, which primarily occurs when opposite charges, usually from different ionizing-particle tracks (in the case of general recombination), collide and recombine within the IC sensitive volume.
"There are thousands of publisher papers showing their accuracy (less than 1%) compared to standard measurement devices (i.e., diode, ion chamber).
Before the X-rays reach the patient, the radiation dose and the quality of the beam are measured in an ion chamber. The gantry of the linac can rotate around the patient, so radiation can be directed to the cancerous cells in a way that reduces the effect on surrounding tissues.
The RSM is a pressurized ion chamber meter which can be used for a variety of medical and health physics applications.
The meter's ion chamber provides quick, accurate readings of skin dose (beta), deep dose (gamma) and x-ray radiation with simple two-button operation.
Those products include the newly developed Victoreen[R] Vehicle Mounted Radiation Detection System, Triage Tags used with the Victoreen ASM-990 Advanced Survey Meter (now wireless), Victoreen 451 Ion Chamber Survey Meters, PRIMALERT[R] Digital Area and Doorway Monitor, Digital Smart 1060AM Area Monitor, RadiaXon[TM] Radiation Attenuation Gloves, and Rad-Con[R] Decontaminants.
In calibrating an imaging system, it would be more helpful to describe the energy dependence in terms of readily measurable parameters, such as index of exposure or sensitivity displayed by the image reader and the radiation recorded in an ion chamber. Tucker and Rezentes (5) presented the relationship between the response and beam quality in these terms.