proportional counter

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pro·por·tion·al count·er

a Geiger-Müller counter operating in the voltage range and under conditions in which pulse height is proportional to the energy of the particles or rays being counted, thus making discrimination between particles or rays of different energies possible.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
The measurements were performed on argon proportional counter at pressure from 0.1 till 0.3 MPa using [sup.55]Fe calibration sources to record the shapes of the pulses from ionization with amplitudes from a few eV till a few keV.
Proportional counters. These use photo-ionization of gases within the counters to detect x-rays.
Key words: electron probe microanalysis; EPMA; gas flow proportional detector; GFPC; pulse pile-up rejection; sealed proportional counter; x ray; XePC; x-ray detectors.
A fragment of a large crystal grown for neutron diffraction studies and the availability of one of the first commercially produced x-ray area-detector system, a Xentronics (#) multiwire image proportional counter, led to one of the highest-resolution datasets for an enzyme, 1.26 A resolution (21-23), at this time.
A decade later Rosat turned its Position Sensitive Proportional Counter (PSPC) toward the spiral galaxy and captured the contour map reproduced below.
Using observations of the Imaging Proportional Counter on the Einstein Observatory satellite, they found first that the intensity of X-ray halos represents an amount of dust consistent with what astrophysicists had calculated from the observed absorption of visible light.