Results 311 to 320 of about 467,220 (351)
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Field corrector for proportional counters
Nuclear Instruments and Methods, 1973Abstract A system for correcting the end field of a proportional counter is described. It consists of concentric rings etched on nonconductive end plates and set at suitable potentials.
G. Ventura +2 more
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2008
The sensitivity of astronomical observations in the soft X-ray band has been increased dramatically by the use of imaging optics and position sensitive focal plane detectors. The tremendous sensitivity increase of imaging telescopes compared with detectors with mechanical collimators has two reasons.
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The sensitivity of astronomical observations in the soft X-ray band has been increased dramatically by the use of imaging optics and position sensitive focal plane detectors. The tremendous sensitivity increase of imaging telescopes compared with detectors with mechanical collimators has two reasons.
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Characteristics of multiware proportional counters
Nuclear Instruments and Methods in Physics Research, 1982Abstract This work summarizes the experience gained during a long work with wall-less, proportional multiwire counters containing in a single frame the main detector surrounded by a ring of guard counters. The simple and reliable fastening structure of the multiwire system is presented; the technical and operational characteristics of counters made ...
A.A. Pomansky +2 more
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Sewing-Needle Proportional Counter
American Journal of Physics, 1957A simple proportional counter made from common materials, and supplied with high voltage by a circuit made from automotive ignition parts, is described and investigated. Alpha particles from Po210 are shown to give up to 25-volt pulses, while beta rays from Cs137 produce signals with amplitudes up to 2 volts without the use of any external ...
A. H. Benade, R. E. Chrien
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Mercury-Vapor Proportional Counters
Review of Scientific Instruments, 1958A mercury-vapor filled proportional counter is described. Its behavior as a γ counter is investigated. The resolution is fair (7.5% energy spread at 60 kev); however, the various mercury x-ray fluorescence yields and absorption cross sections combine to make the output spectrum of the counter complex and difficult to interpret.
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Electron kinetics in proportional counters
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2000Abstract A Boltzmann equation description of the electron behavior under the non-uniform field geometry is presented for modeling the gas amplification process of the proportional counters. Specifically, we apply the arrival-time spectra (ATS) method to deduce the equation leading to the counter gas gain.
Hiroaki Tagashira +3 more
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Point anode proportional counters
Journal of Scientific Instruments, 1963An experimental investigation of point anode proportional counters is described. The point to end-window distance is found to be an important parameter in determining counter performance. A resolution of 21% at 6 kev can be achieved with an end window 7/8 in. in diameter in a counter of internal dimensions only 1 in. × 1 3/8 in.
P W Sanford, E Mathieson
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A locus-sensitive proportional counter
Journal of Scientific Instruments, 1967A proportional counter has been constructed with a gas amplification factor varying continuously by several orders of magnitude over the tube length. Used as a detector for monochromatic radiation, the apparatus is designed to yield a pulse spectrum mapping the locus of the incoming radiation.
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A study of proportional counter mechanisms
The International Journal of Applied Radiation and Isotopes, 1968Abstract In order to examine the operation of proportional counters, as used for 4πs detectors, observations were made on both the electrical pulse and that induced in a photomultiplier which viewed the discharge directly. Measurements on the relative gas gain, the shape of the photon pulse and the electron transit time are described for methane and ...
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The Proportional Counter as Detector and Spectrometer
1958The proportional counter as we now know it has been developed rapidly since 1948. It is true that prior to this time it was widely appreciated that counting tubes could be used at voltages such that the output pulses differed according to the nature of the ionizing particle passing into or through the vessel [1]. A semi-proportional region of operation
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