Results 231 to 240 of about 52,108 (269)

The Time Resolution of a Vacuum Fission Chamber

Instruments and Experimental Techniques, 2003
The process of the formation of a signal by a vacuum fission chamber (VFC) under the irradiation by a short-duration pulsed neutron flux is considered for the first time. It is shown that the collection time of charge carriers in the VFC with plane–parallel electrodes does not exceed 0.4 ns at a supply voltage of >100 V and that the square of the VFC ...
S. V. Chuklyaev, Yu. N. Pepelyshev
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High Temperature Fission Chambers

IRE Transactions on Nuclear Science, 1962
Our objective was to design fission chambers capable of operating at high temperatures in reactor control, and consequently possessing the essential characteristics of extreme ruggedness for relativity high neutron sensitivity. In the following paper two types of chamber: one designed to operate at 400°C, and the other at 600°C, are described.
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The spark chamber as a detector of fission fragments

Nuclear Instruments and Methods, 1963
Abstract The usefulness of a corona type spark chamber for the detection of fission fragments in the presence of a very high alpha particle background has been investigated. It was found that the ratio of detection efficiency for fission fragments compared to alpha particles can be made as large as 3 × 10 7 or better while retaining an efficiency of
C.D. Bowman, R.W. Hill
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Nuclear Fission Investigation with Twin Ionization Chamber

AIP Conference Proceedings, 2011
The purpose of the present paper was to report the recent results, obtained in development of digital pulse processing mathematics for prompt fission neutron (PFN) investigation using twin ionization chamber (TIC) along with fast neutron time‐of‐flight detector (ND). Due to well known ambiguities in literature (see refs. [4, 6, 9 and 11]), concerning a
O. Zeynalova, Sh. Zeynalov, M. Nazarenko, F.-J. Hambsch, S. Oberstedt, Michail D. Todorov, Christo I. Christov   +6 more
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Investigations on irradiated fission chamber electrodes

Journal of Nuclear Materials, 1975
Abstract Analysis of some failed in-core fission chambers in a power reactor made a series of investigations on fission chamber electrodes necessary. Two types of electrodes with different uranium coating techniques were used. One type of electrodes was first exposed to maximum neutron doses of 2 × 10 20 nvt at steady-state operation.
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Experimental study of columnar recombination in fission chambers

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016
Abstract In this paper, we present experimental saturation curves of a small gap miniature fission chamber obtained in the MINERVE reactor. The chamber is filled with argon at various pressures, and the fissile material can be coated on the anode, cathode, or both.
Filliatre, P., Lamirand, V., Geslot, B., Jammes, C.   +3 more
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A twin ionization chamber for fission fragment detection

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1987
Abstract A twin ionization chamber for fission fragment detection is described. The detector permits measurement of the two fission fragment kinetic energies in an advantageous 2×2 π geometry with an energy resolution ...
C. Budtz-Jørgensen, H.-H. Knitter, Ch. Straede, F.-J. Hambsch, R. Vogt   +4 more
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A fission chamber with intrinsic suppression of alpha background

Nuclear Instruments and Methods, 1978
Abstract A fast ionisation chamber for detection of fission fragments with intrinsic suppression of alpha background is presented. In the construction of this chamber use has been made of the fact that alpha-particles of 5 to 6 MeV have a range in matter of about twice that of fission fragments.
C. Budtz-Jørgensen, H.-H. Knitter
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Saturation current of miniaturized fission chambers

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
Abstract We present the detailed formulae of the saturation currents for the four main categories of fission chambers operating in current mode. The results obtained are function of simple parameters: number of fission reactions within the chamber deposits, geometric characteristics of the electrodes and filling gas properties.
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Fast Fission Chamber Amplifier-Discriminator System

Review of Scientific Instruments, 1970
To measure the fission cross section of 233U as a function of neutron energy, instrumentation with fast pulse rise-time and short resolving time characteristics is required. The efficient detection of fission-fragment pulses in the presence of a high alpha background requires these characteristics. A fission detector with an electron collection time of
R. W. Ingle, F. E. Gillespie, L. W. Weston   +2 more
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