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AbstractAbstract
[en] In this paper we give the main characteristics of a great dynamic fission chamber (11 decades)
Original Title
Chambre a fission grande dynamique
Primary Subject
Secondary Subject
Source
CEA Centre d'Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. d'Electronique et d'Instrumentation Nucleaire; 451 p; 1993; p. 4.108-4.125; Gif-sur-Yvette (FR); Commissariat a l'Energie Atomique; Electronic days on technologies of sensors; Saclay (France); 2-4 Feb 1993
Record Type
Book
Literature Type
Conference
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Farcy, Paul.
CEA, 75 - Paris (France)1980
CEA, 75 - Paris (France)1980
AbstractAbstract
[en] This invention refers to a detector of particles that enables accurate determinations to be effected at high temperature, irrespective of the particle flux to which it is subjected (for example, a neutron flux in the core of a reactor) and preferentially is of elongated shape and particularly reduced radial section. According to the invention, the specifications of this detector include a body in a single piece, made of a ceramic material, in which are embedded and sealed two concentric tubular electrodes forming between them an annular chamber filled with a gas under pressure and electric wires connecting the electrodes to the outside of the body
[fr]
L'invention a pour objet un detecteur de particules permettant de realiser des mesures precises a haute temperature, quel que soit le flux de particules auquel il est soumis (par exemple, flux de neutrons dans le coeur d'un reacteur) et presentant de preference une forme allongee et de section radiale particulierement reduite. Ce detecteur selon l'invention est caracterise en ce qu'il comprend un corps en une seule piece, en materiau ceramique, dans lequel sont noyees de facon etanche deux electrodes tubulaires concentriques definissant entre elles une chambre annulaire remplie de gaz sous pression, et des fils de liaison electriques reliant les electrodes a l'exterieur du corpsOriginal Title
Detecteur de particules et son procede de fabrication
Source
24 Oct 1980; 15 p; FR PATENT DOCUMENT 2452783/A/; Available from Institut National de la Propriete Industrielle, Paris (France)
Record Type
Patent
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AbstractAbstract
[en] Multiplate fission chambers were used in experiments at TRIUMF to measure the absolute muon induced fission yield. To determine the yield, the fission chamber detection efficiencies must be known. In this paper, the methods of efficiency calibration have been discussed. (author)
Primary Subject
Record Type
Journal Article
Journal
Nuclear Science and Applications. Series B; ISSN 0369-6510;
; v. 14-15 p. 24-28

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INIS IssueINIS Issue
Napolitano, C.M.; Pereira, M.C.C.
Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)1990
Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)1990
AbstractAbstract
[en] Published in summary form only
Original Title
Deposicao molecular de uranio em eletrodos de camara de fissao
Primary Subject
Source
1990; 1 p
Record Type
Miscellaneous
Report Number
Country of publication
LanguageLanguage
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Todt, W.H. Sr.
Westinghouse Electric Corp., Pittsburgh, PA (USA); Deutsches Patentamt, Muenchen (Germany, F.R.)1978
Westinghouse Electric Corp., Pittsburgh, PA (USA); Deutsches Patentamt, Muenchen (Germany, F.R.)1978
AbstractAbstract
[en] The neutron detector consists of a fission chamber and a compensated ionisation chamber for neutron flux between 1 and 1010/cm2/sec. The maximum flux for neutron detectors in impulse counting operation is limited by the saturation and the minimum which is detectable due to DCα signal noise. The detector contains a small quantity of UO2 which is deposited on an electrode. Part of the detector is in the form of a compensation chamber. It contains Ra226. The α signal noise is suppressed by the reduction of the U 234 content in UO2 to less than 100 ppm. The γ compensation signal can be produced by an external circuit. (DG) 891 HP
[de]
Der Neutronendetektor besteht aus einer Spaltkammer und einer kompensierten Ionisationskammer fuer einen Neutronenfluss zwischen 1 und 1010/cm2/sec. Der maximale Fluss fuer Neutronendetektoren im Impulszaehlbetrieb wird begrenzt durch die Saettigung und der minimale nachweisbare durch das Gleichstrom-α-Signalrauschen. Der Detektor enthaelt eine kleine Menge von UO2, das auf einer Elektrode aufgebracht ist. Ein Teil des Detektors ist als γ-Kompensationskammer ausgebildet. In ihr ist Ra226 enthalten. Das α-Signalrauschen wird durch die Verringerung des U-234 Gehaltes im UO2 auf kleiner 100 ppm unterdrueckt. γ-Kompensationssignal kann auch durch eine aeussere Schaltung erzeugt werden. (DG)Original Title
Neutronennachweissystem
Primary Subject
Secondary Subject
Source
19 Jan 1978; 10 p; DE PATENT DOCUMENT 2729210/A/
Record Type
Patent
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Reference NumberReference Number
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Fuller, J.L.; Gilliam, D.M.; Grundl, J.A.
Dosimetry methods for fuels, cladding and structural materials1980
Dosimetry methods for fuels, cladding and structural materials1980
AbstractAbstract
[en] A prototype fission chamber has been extensively tested and several chambers assembled in preparation for the Fast Flux Test Facility - Reactor Characterization Program (FFTF - RCP). The major portion of our report concerns the chamber design and performance characteristics. The absolute efficiency of the device will not be explicitly discussed. In ruggedizing the chamber, great care has been taken not to significantly alter the absolute efficiency as compared to the more conventional NBS configuration. This configuration and the measurement of absolute fission rates have already been rigorously discussed in an earlier report. The FFTF characterization effort will be reported in a future paper after the measurements have been completed
Source
Roettger, H. (ed.); Commission of the European Communities, Petten (Netherlands). Joint Nuclear Research Center; 642 p; ISBN 92-825-1868-X;
; 1980; p. 1152-1159; 3. ASTM-EURATOM symposium on reactor dosimetry; Ispra, Italy; 1 - 5 Oct 1979

Record Type
Report
Literature Type
Conference
Report Number
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Gooding, A.
UKAEA Reactor Group, Winfrith. Atomic Energy Establishment1975
UKAEA Reactor Group, Winfrith. Atomic Energy Establishment1975
AbstractAbstract
[en] The main causes of residual activation currents in dc mean current ionisation chambers are briefly discussed. Theoretical and experimental aspects of fission product and wall activation effects are considered and performance data for a typical chamber derived. The likely ways in which this performance can be changed by modifications to the design are stated. (author)
Secondary Subject
Source
Jul 1975; 8 p
Record Type
Report
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Dayal, Yogeshwar; Culbertson, R.J.
General Electric Co., New York (USA)1974
General Electric Co., New York (USA)1974
AbstractAbstract
No abstract available
Source
17 Dec 1974; 15 p; CA PATENT DOCUMENT 959581; Available from Commissioner of Patents, Ottawa; Filed 4 Apr 1972. Priority USA 15 Apr 1971 (134,339). 5 claims, 9 figs. Available from Commissioner of Patents, Ottawa.
Record Type
Patent
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AbstractAbstract
No abstract available
Source
American Nuclear Society meeting; San Francisco, CA, USA; 12 - 16 Nov 1979; CONF-791103--; Published in summary form only.
Record Type
Journal Article
Literature Type
Conference
Journal
Transactions of the American Nuclear Society; ISSN 0003-018X;
; v. 33 p. 696-697

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Pál, L.; Pázsit, I., E-mail: imre@chalmers.se2015
AbstractAbstract
[en] The signals of fission chambers are usually evaluated with the help of the co-called Campbelling techniques. These are based on the Campbell theorem, which states that if the primary incoming events, generating the detector pulses, are independent, then relationships exist between the moments of various orders of the signal in the current mode. This gives the possibility to determine the mean value of the intensity of the detection events, which is proportional to the static flux, from the higher moments of the detector current, which has certain advantages. However, the main application area of fission chambers is measurements in power reactors where, as is well known, the individual detection events are not independent, due to the branching character of the neutron chains (neutron multiplication). Therefore it is of interest to extend the Campbelling-type theory for the case of correlated neutron events. Such a theory could address two questions: partly, to investigate the bias when the traditional Campbell techniques are used for correlated incoming events; and partly, to see whether the correlation properties of the detection events, which carry information on the multiplying medium, could be extracted from the measurements. This paper is devoted to the investigation of these questions. The results show that there is a potential possibility to extract the same information from fission chamber signals in the current mode as with the Rossi- or Feynman-alpha methods, or from coincidence and multiplicity measurements, which so far have required detectors working in the pulse mode. It is also shown that application of the standard Campbelling techniques to neutron detection in multiplying systems does not lead to an error for estimating the stationary flux as long as the detector is calibrated in in situ measurements
Primary Subject
Source
S0168-9002(15)00616-6; Available from http://dx.doi.org/10.1016/j.nima.2015.05.006; Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002;
; CODEN NIMAER; v. 794; p. 90-101

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